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Cheap flights from Sydney to Ko Samui from $397

SYD — USM
5 Oct — 12 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Sydney to Ko Samui

Enter your travel dates to find the best prices.

Cheapest flights from Sydney to Ko Samui

Mon 26/1013:25 -
1 stop25h 30m
Wed 11/1118:05 -
1 stop14h 05m
Deal found 2/9$780
Mon 19/1021:35 -
1 stop25h 15m
Sun 1/1119:45 -
1 stop12h 25m
Deal found 3/9$801
Mon 19/1021:35 -
1 stop25h 15m
Mon 23/1108:55 -
1 stop29h 55m
Deal found 1/9$819
Wed 14/1021:35 -
1 stop23h 45m
Fri 30/1019:45 -
1 stop19h 05m
Deal found 1/9$844
Wed 21/1014:00 -
1 stop32h 50m
Tue 27/1019:45 -
1 stop19h 05m
Deal found 4/9$858
Mon 12/1014:00 -
1 stop32h 50m
Mon 19/1008:40 -
1 stop31h 40m
Deal found 4/9$883
Mon 26/1013:25 -
2 stops26h 30m
Wed 11/1118:05 -
1 stop14h 05m
Deal found 2/9$884
Sun 15/1120:05 -
1 stop25h 05m
Mon 30/1119:45 -
1 stop19h 05m
Deal found 31/8$890
Wed 14/1021:35 -
1 stop25h 15m
Fri 30/1015:50 -
2 stops23h 00m
Deal found 1/9$891
Fri 16/1014:00 -
2 stops34h 25m
Fri 23/1008:00 -
2 stops24h 45m
Deal found 1/9$899

Find flight deals from Sydney to Ko Samui

Round-trip from

$780

One-way from

$397

Popular in

December

Cheapest in

March

Average price

$1,382
Scoot
  • Scoot
  • 26/10-11/11
  • 2 total stops
  • 39h 35m total
  • Sydney to Ko Samui
Search Deals
Scoot
  • Scoot
  • 14/10-31/12
  • 1 total stop
  • 25h 15m total
  • Sydney to Ko Samui
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($163 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($46 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Sydney to Ko Samui that are best for you.

Fly from

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Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Mon 12/10

21:35-10:10

1 stop16h 35m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$430

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Wed 16/9

20:50-11:55

2 stops18h 05m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$448

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Wed 2/12

22:10-17:10

3 stops23h 00m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$741

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Mon 12/10

12:25-11:15

2 stops26h 50m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$777

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Wed 16/9

20:35-18:50

1 stop25h 15m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$784

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Sun 11/10

10:50-07:10

1 stop24h 20m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$869

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Fri 1/1

20:05-11:00

1 stop18h 55m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$876

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Fri 1/1

15:50-20:50

3 stops33h 00m

Ko Samui

Wed 31/12

00:00-03:00

Nonstop0h 00m

$894

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Thu 10/9

20:35-20:25

2 stops26h 50m

Ko Samui

Thu 17/9

08:00-19:20

2 stops32h 20m

$1,119

SydneyKo Samui

SYD Sydney Kingsford Smith - USM Ko Samui

SYDUSM

Sydney Kingsford Smith

Wed 28/10

20:05-18:50

1 stop26h 45m

Ko Samui

Sun 1/11

18:05-18:50

1 stop20h 45m

$1,145

Flights are sorted by cheapest return flights first.

Deals found on 2/9

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Best time to book a flight from Sydney to Ko Samui

Have a flexible travel schedule? Discover the best time to fly to Ko Samui from Sydney with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Sydney to Ko Samui

How far ahead should I book a flight from Sydney to Ko Samui?

Booking 38 days in advance of your planned departure date is, on average, the best time to get cheap flights from Sydney to Ko Samui. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Sydney to Ko Samui?

Currently, March is the cheapest month in which you can book a flight from Sydney to Ko Samui (average of $922). Flying from Sydney to Ko Samui in December is currently the most expensive (average of $1,536). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from Sydney to Ko Samui?

Airfare is below average for this route at the moment.

Sydney to Ko Samui flights typically cost between $1,198 and $1,474 in October.
The cheapest return price found within the last 5 days was $780 on Scoot (26 Oct–11 Nov).

Reviews of airlines servicing Ko Samui

Read through reviews of airlines operating flights from Sydney to Ko Samui, such as Singapore Airlines,Thai Airways, andQantas Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Singapore Airlines
8.2
Very Good
1,595 reviews
Check prices

Food

7.8

Overall

8.2

Crew

8.6

Boarding

8.3

Entertainment

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Walter,Aug 2026

DPS - SIN

My experience with Cathay Pacific started badly and only became more frustrating as the trip continued. It began when my original flight, which I had booked in Business Class, was canceled. Because of the cancellation, I was involuntarily downgraded. I understood that disruptions happen and was willing to accept the downgrade, but the way Cathay Pacific handled the situation afterward was extremely disappointing. The biggest issue was the lack of communication between airports. When I arrived at the next airport, the staff apparently had no record or confirmation that Cathay Pacific had downgraded me. As a result, I was forced to wait approximately an hour and a half while they tried to verify what had happened and determine how to handle my reservation. This happened at around 2:00 a.m., after an exhausting travel day that had already stretched to roughly 22 hours because of delays. At that point, I was completely exhausted and simply wanted to get to my destination and rest. Having to spend another 90 minutes resolving an issue that should have already been documented and communicated internally made an already difficult travel experience considerably worse. What was even more disappointing was the refund process. Because I had paid for Business Class but was involuntarily downgraded, I expected the fare difference to be refunded automatically. Instead, I discovered that I had to contact Cathay Pacific myself to request reimbursement. When I called, I was initially told that my situation did not qualify for a refund and that I would only be offered a travel voucher. I found that response unacceptable. I had paid for Business Class transportation that Cathay Pacific ultimately did not provide. A voucher requiring me to spend money with the airline again is not the same as refunding money for a service that was never delivered. After several heated minutes of discussion, Cathay Pacific finally agreed to refund both tickets. The cancellation itself was understandable. Even the involuntary downgrade was something I was prepared to accept given the circumstances. What made this experience unacceptable was the poor communication between airports, the lengthy middle-of-the-night delay caused by Cathay Pacific’s internal handling of the downgrade, and then having to argue simply to receive a refund for the Business Class service I had paid for but did not receive. For an airline that markets itself as a premium international carrier, I expected significantly better communication, customer service, and handling of an involuntary downgrade. Unfortunately, after this experience, Cathay Pacific has lost my confidence as a customer. This will be the last time I choose to fly with them.
Singapore Airlines
8.2
Very Good
1,595 reviews
Singapore Airlines
8.2
Very Good
1,595 reviews
Check prices

Food

7.8

Overall

8.2

Crew

8.6

Boarding

8.3

Entertainment

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Walter,Aug 2026

DPS - SIN

My experience with Cathay Pacific started badly and only became more frustrating as the trip continued. It began when my original flight, which I had booked in Business Class, was canceled. Because of the cancellation, I was involuntarily downgraded. I understood that disruptions happen and was willing to accept the downgrade, but the way Cathay Pacific handled the situation afterward was extremely disappointing. The biggest issue was the lack of communication between airports. When I arrived at the next airport, the staff apparently had no record or confirmation that Cathay Pacific had downgraded me. As a result, I was forced to wait approximately an hour and a half while they tried to verify what had happened and determine how to handle my reservation. This happened at around 2:00 a.m., after an exhausting travel day that had already stretched to roughly 22 hours because of delays. At that point, I was completely exhausted and simply wanted to get to my destination and rest. Having to spend another 90 minutes resolving an issue that should have already been documented and communicated internally made an already difficult travel experience considerably worse. What was even more disappointing was the refund process. Because I had paid for Business Class but was involuntarily downgraded, I expected the fare difference to be refunded automatically. Instead, I discovered that I had to contact Cathay Pacific myself to request reimbursement. When I called, I was initially told that my situation did not qualify for a refund and that I would only be offered a travel voucher. I found that response unacceptable. I had paid for Business Class transportation that Cathay Pacific ultimately did not provide. A voucher requiring me to spend money with the airline again is not the same as refunding money for a service that was never delivered. After several heated minutes of discussion, Cathay Pacific finally agreed to refund both tickets. The cancellation itself was understandable. Even the involuntary downgrade was something I was prepared to accept given the circumstances. What made this experience unacceptable was the poor communication between airports, the lengthy middle-of-the-night delay caused by Cathay Pacific’s internal handling of the downgrade, and then having to argue simply to receive a refund for the Business Class service I had paid for but did not receive. For an airline that markets itself as a premium international carrier, I expected significantly better communication, customer service, and handling of an involuntary downgrade. Unfortunately, after this experience, Cathay Pacific has lost my confidence as a customer. This will be the last time I choose to fly with them.
Thai Airways
7.9
Good
418 reviews
Singapore Airlines
8.2
Very Good
1,595 reviews
Check prices

Food

7.8

Overall

8.2

Crew

8.6

Boarding

8.3

Entertainment

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Walter,Aug 2026

DPS - SIN

My experience with Cathay Pacific started badly and only became more frustrating as the trip continued. It began when my original flight, which I had booked in Business Class, was canceled. Because of the cancellation, I was involuntarily downgraded. I understood that disruptions happen and was willing to accept the downgrade, but the way Cathay Pacific handled the situation afterward was extremely disappointing. The biggest issue was the lack of communication between airports. When I arrived at the next airport, the staff apparently had no record or confirmation that Cathay Pacific had downgraded me. As a result, I was forced to wait approximately an hour and a half while they tried to verify what had happened and determine how to handle my reservation. This happened at around 2:00 a.m., after an exhausting travel day that had already stretched to roughly 22 hours because of delays. At that point, I was completely exhausted and simply wanted to get to my destination and rest. Having to spend another 90 minutes resolving an issue that should have already been documented and communicated internally made an already difficult travel experience considerably worse. What was even more disappointing was the refund process. Because I had paid for Business Class but was involuntarily downgraded, I expected the fare difference to be refunded automatically. Instead, I discovered that I had to contact Cathay Pacific myself to request reimbursement. When I called, I was initially told that my situation did not qualify for a refund and that I would only be offered a travel voucher. I found that response unacceptable. I had paid for Business Class transportation that Cathay Pacific ultimately did not provide. A voucher requiring me to spend money with the airline again is not the same as refunding money for a service that was never delivered. After several heated minutes of discussion, Cathay Pacific finally agreed to refund both tickets. The cancellation itself was understandable. Even the involuntary downgrade was something I was prepared to accept given the circumstances. What made this experience unacceptable was the poor communication between airports, the lengthy middle-of-the-night delay caused by Cathay Pacific’s internal handling of the downgrade, and then having to argue simply to receive a refund for the Business Class service I had paid for but did not receive. For an airline that markets itself as a premium international carrier, I expected significantly better communication, customer service, and handling of an involuntary downgrade. Unfortunately, after this experience, Cathay Pacific has lost my confidence as a customer. This will be the last time I choose to fly with them.
Qantas Airways
7.5
Good
1,090 reviews
Singapore Airlines
8.2
Very Good
1,595 reviews
Check prices

Food

7.8

Overall

8.2

Crew

8.6

Boarding

8.3

Entertainment

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Walter,Aug 2026

DPS - SIN

My experience with Cathay Pacific started badly and only became more frustrating as the trip continued. It began when my original flight, which I had booked in Business Class, was canceled. Because of the cancellation, I was involuntarily downgraded. I understood that disruptions happen and was willing to accept the downgrade, but the way Cathay Pacific handled the situation afterward was extremely disappointing. The biggest issue was the lack of communication between airports. When I arrived at the next airport, the staff apparently had no record or confirmation that Cathay Pacific had downgraded me. As a result, I was forced to wait approximately an hour and a half while they tried to verify what had happened and determine how to handle my reservation. This happened at around 2:00 a.m., after an exhausting travel day that had already stretched to roughly 22 hours because of delays. At that point, I was completely exhausted and simply wanted to get to my destination and rest. Having to spend another 90 minutes resolving an issue that should have already been documented and communicated internally made an already difficult travel experience considerably worse. What was even more disappointing was the refund process. Because I had paid for Business Class but was involuntarily downgraded, I expected the fare difference to be refunded automatically. Instead, I discovered that I had to contact Cathay Pacific myself to request reimbursement. When I called, I was initially told that my situation did not qualify for a refund and that I would only be offered a travel voucher. I found that response unacceptable. I had paid for Business Class transportation that Cathay Pacific ultimately did not provide. A voucher requiring me to spend money with the airline again is not the same as refunding money for a service that was never delivered. After several heated minutes of discussion, Cathay Pacific finally agreed to refund both tickets. The cancellation itself was understandable. Even the involuntary downgrade was something I was prepared to accept given the circumstances. What made this experience unacceptable was the poor communication between airports, the lengthy middle-of-the-night delay caused by Cathay Pacific’s internal handling of the downgrade, and then having to argue simply to receive a refund for the Business Class service I had paid for but did not receive. For an airline that markets itself as a premium international carrier, I expected significantly better communication, customer service, and handling of an involuntary downgrade. Unfortunately, after this experience, Cathay Pacific has lost my confidence as a customer. This will be the last time I choose to fly with them.
Scoot
6.7
Okay
331 reviews
Singapore Airlines
8.2
Very Good
1,595 reviews
Check prices

Food

7.8

Overall

8.2

Crew

8.6

Boarding

8.3

Entertainment

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Walter,Aug 2026

DPS - SIN

My experience with Cathay Pacific started badly and only became more frustrating as the trip continued. It began when my original flight, which I had booked in Business Class, was canceled. Because of the cancellation, I was involuntarily downgraded. I understood that disruptions happen and was willing to accept the downgrade, but the way Cathay Pacific handled the situation afterward was extremely disappointing. The biggest issue was the lack of communication between airports. When I arrived at the next airport, the staff apparently had no record or confirmation that Cathay Pacific had downgraded me. As a result, I was forced to wait approximately an hour and a half while they tried to verify what had happened and determine how to handle my reservation. This happened at around 2:00 a.m., after an exhausting travel day that had already stretched to roughly 22 hours because of delays. At that point, I was completely exhausted and simply wanted to get to my destination and rest. Having to spend another 90 minutes resolving an issue that should have already been documented and communicated internally made an already difficult travel experience considerably worse. What was even more disappointing was the refund process. Because I had paid for Business Class but was involuntarily downgraded, I expected the fare difference to be refunded automatically. Instead, I discovered that I had to contact Cathay Pacific myself to request reimbursement. When I called, I was initially told that my situation did not qualify for a refund and that I would only be offered a travel voucher. I found that response unacceptable. I had paid for Business Class transportation that Cathay Pacific ultimately did not provide. A voucher requiring me to spend money with the airline again is not the same as refunding money for a service that was never delivered. After several heated minutes of discussion, Cathay Pacific finally agreed to refund both tickets. The cancellation itself was understandable. Even the involuntary downgrade was something I was prepared to accept given the circumstances. What made this experience unacceptable was the poor communication between airports, the lengthy middle-of-the-night delay caused by Cathay Pacific’s internal handling of the downgrade, and then having to argue simply to receive a refund for the Business Class service I had paid for but did not receive. For an airline that markets itself as a premium international carrier, I expected significantly better communication, customer service, and handling of an involuntary downgrade. Unfortunately, after this experience, Cathay Pacific has lost my confidence as a customer. This will be the last time I choose to fly with them.

Related info for your journey

  • How long is the flight from Sydney to Ko Samui?

    Scoot can get you from Sydney to Ko Samui in just under 26h 45m. Your travel time can differ by up to . The distance from Sydney to Ko Samui is about 7234 km.

  • What are the cheapest airlines flying from Sydney to Ko Samui round-trip?

    Scoot, at $684, was found to be the cheapest airline from Sydney to Ko Samui.Alternate airlines to your destination round-trip include Qantas Airways and Singapore Airlines. Users have found that Scoot is 41% cheaper than the other options available to this destination.

  • Can I find deals for flights from Sydney to Ko Samui that include hotel bookings?

    Yes. In addition to deals on Sydney to Ko Samui flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Sydney to Ko Samui?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to Ko Samui.

  • Can I find deals for business class flights from Sydney to Ko Samui?

    Yes. Cheapflights offers flight deals from Sydney to Ko Samui by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Sydney to Ko Samui?

    Currently, March is the cheapest month in which you can book a flight from Sydney to Ko Samui (average of $922). Flying from Sydney to Ko Samui in December is currently the most expensive (average of $1,536). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Ko Samui?

Book flights to Ko Samui if you plan to visit one of these locations
Ko Tao
Ko Pha Ngan

Browse thousands of different options on Cheapflights for your next trip

Fly from Sydney to Ko Samui on these airlines

Singapore Airlines flights from Sydney Kingsford Smith to Ko Samui
Qantas Airways flights from Sydney Kingsford Smith to Ko Samui

Top 4 airlines flying from Sydney to Ko Samui

AirlineCheapestAverageFlexibilityOn-time
ScootCheapest$684Average$1,061FlexibilityNo cancel feeOn-timeN/A
Search Scoot flights
Qantas AirwaysCheapest$965Average$1,230FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
Singapore AirlinesCheapest$1,129Average$1,390FlexibilityNo cancel feeOn-time81%
Search Singapore Airlines flights
Thai AirwaysCheapest$1,219Average$1,395FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights

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By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Ko Samui from Sydney.

Can Cheapflights find flights from Sydney to Ko Samui with no change fees?

Certainly. Search results for flights to Ko Samui from Sydney shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Ko Samui from Sydney today and book when prices fit your budget.

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