How long is the flight from Sydney to Illinois?

Departing from Sydney to Illinois will take you 23h 19m. The distance between Sydney and Illinois is about 14571 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

What are the most popular routes from Sydney to Illinois?

The most popular route from Sydney to Illinois is Sydney Kingsford Smith - Chicago O'Hare Intl. You may also consider Sydney Kingsford Smith - Chicago Midway or Sydney Kingsford Smith - Lambert-St Louis.

What are the most popular airlines that fly from Sydney to Illinois?

Qantas Airways, Air Canada and United Airlines are the most popular airlines when flying from Sydney to Illinois.

What is the cheapest time of day to fly from SYD to IL?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Sydney to Illinois as you normally would.

What airport do you fly from for flights from Sydney to Illinois?

If you book a flight to Illinois from Sydney, you will be flying from Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 7.5 km from the centre of Sydney.

Can I find deals for flights from Sydney to Illinois that include hotel bookings?

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

How can I find direct flights from Sydney to Illinois?

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

Can I find deals for business class flights from Sydney to Illinois?

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

$1,003+ Cheap Flights from Sydney to Illinois

Cheap flight deals from Sydney to Illinois

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Sydney to Illinois
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Tue 8/913:15 -

2 stops32h 02m

Tue 22/906:30 -

3 stops48h 55m

Deal found 16/8$1,156

Thu 10/913:15 -

3 stops26h 30m

Fri 25/910:26 -

3 stops34h 24m

Deal found 20/8$1,325

Fri 9/1014:15 -

3 stops31h 01m

Sun 25/1006:30 -

3 stops38h 05m

Deal found 20/8$1,389

Thu 3/909:30 -

2 stops48h 32m

Wed 16/906:30 -

2 stops33h 30m

Deal found 18/8$1,527

Mon 31/806:25 -

2 stops24h 29m

Tue 15/921:10 -

2 stops57h 05m

Deal found 16/8$1,714

Tue 8/909:55 -

2 stops28h 10m

Tue 22/916:00 -

2 stops25h 45m

Deal found 16/8$1,727

Tue 17/1111:20 -

2 stops23h 34m

Tue 1/1214:54 -

2 stops25h 06m

Deal found 18/8$1,731

Wed 4/1111:50 -

2 stops26h 59m

Mon 9/1110:34 -

2 stops31h 01m

Deal found 18/8$1,748

Tue 17/1111:50 -

2 stops23h 19m

Tue 1/1213:08 -

3 stops26h 57m

Deal found 18/8$1,756

Tue 13/1010:10 -

1 stop29h 36m

Thu 5/1106:02 -

1 stop33h 58m

Deal found 20/8$1,784

Sun 30/809:30 -

2 stops40h 25m

Tue 15/906:25 -

2 stops33h 35m

Deal found 19/8$1,795

Tue 13/1010:30 -

2 stops22h 07m

Thu 5/1113:08 -

3 stops26h 57m

Deal found 20/8$1,810

Best flights from Sydney to Illinois
Discover carefully curated flight deals from Sydney to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Tue 26/111:20 -

1 stop29h 39m

Sat 30/110:12 -

2 stops32h 33m

Deal found 20/8$1,561

Wed 4/1111:50 -

2 stops26h 59m

Mon 9/1110:34 -

2 stops31h 01m

Deal found 20/8$1,748

Tue 17/1111:50 -

2 stops23h 19m

Tue 1/1213:08 -

3 stops26h 57m

Deal found 18/8$1,756

Wed 4/1115:15 -

1 stop38h 40m

Mon 9/1114:35 -

1 stop37h 15m

Deal found 20/8$2,046

Thu 1/1010:10 -

1 stop42h 45m

Thu 8/1016:15 -

2 stops34h 20m

Deal found 17/8$2,168

Thu 5/1121:35 -

2 stops54h 25m

Thu 12/1111:45 -

2 stops38h 40m

Deal found 18/8$2,277

Wed 4/1110:40 -

2 stops23h 07m

Wed 11/1113:22 -

2 stops26h 08m

Deal found 18/8$2,443

Tue 26/122:10 -

2 stops38h 31m

Sat 30/110:12 -

2 stops40h 08m

Deal found 18/8$2,867

Sat 21/1111:20 -

2 stops22h 37m

Sat 28/1121:48 -

2 stops40h 12m

Deal found 20/8$1,810

Tue 13/1011:20 -

2 stops21h 17m

Thu 5/1113:08 -

2 stops27h 12m

Deal found 20/8$1,810

Tue 3/1115:15 -

1 stop38h 40m

Mon 9/1114:35 -

1 stop37h 15m

Deal found 20/8$2,127

Tue 8/920:45 -

2 stops37h 36m

Wed 23/919:00 -

2 stops32h 50m

Deal found 18/8$2,202

Sun 4/1010:10 -

1 stop29h 20m

Sun 11/1006:04 -

1 stop34h 01m

Deal found 20/8$2,377

Tue 3/1110:40 -

2 stops24h 20m

Tue 10/1112:30 -

2 stops27h 00m

Deal found 18/8$2,443

Thu 3/919:45 -

2 stops33h 35m

Wed 16/916:15 -

1 stop36h 55m

Deal found 16/8$2,238

Mon 12/1010:15 -

2 stops38h 29m

Mon 19/1012:49 -

2 stops27h 01m

Deal found 18/8$2,443

Thu 1/1009:10 -

2 stops22h 30m

Thu 8/1015:20 -

1 stop23h 35m

Deal found 17/8$2,450

Sun 4/1011:20 -

2 stops27h 10m

Sun 11/1009:00 -

2 stops31h 00m

Deal found 20/8$2,232

Thu 10/920:45 -

2 stops35h 25m

Fri 18/918:08 -

2 stops33h 42m

Deal found 18/8$2,332

Mon 12/1010:15 -

2 stops28h 18m

Sun 25/1012:27 -

2 stops27h 03m

Deal found 21/8$2,446

Mon 7/910:20 -

1 stop21h 16m

Tue 22/915:56 -

2 stops24h 04m

Deal found 16/8$2,253

Fri 4/920:45 -

2 stops35h 25m

Fri 18/918:08 -

2 stops33h 42m

Deal found 16/8$2,411

Tue 3/1111:50 -

2 stops22h 15m

Mon 9/1121:35 -

1 stop40h 25m

Deal found 20/8$2,263

Fri 9/1010:15 -

2 stops23h 45m

Sun 25/1010:01 -

2 stops29h 29m

Deal found 20/8$2,513

Wed 4/1110:40 -

2 stops24h 20m

Mon 9/1113:22 -

2 stops26h 08m

Deal found 18/8$2,671

Thu 5/1110:40 -

2 stops23h 07m

Tue 10/1113:22 -

2 stops26h 08m

Deal found 18/8$2,675

Wed 30/909:15 -

2 stops24h 18m

Wed 7/1010:59 -

2 stops28h 51m

Deal found 16/8$2,734

Sat 3/1009:15 -

2 stops23h 44m

Sat 10/1013:27 -

2 stops26h 23m

Deal found 19/8$2,841

Thu 3/909:15 -

2 stops24h 18m

Wed 16/913:00 -

2 stops26h 50m

Deal found 16/8$2,884

Find flight deals from Sydney to Illinois

Round-trip from	$1,156
One-way from	$1,003
Popular in	July
Cheapest in	October
Average price	$1,613

8/9-22/9
5 total stops
80h 57m total
Sydney to Illinois

Search Deals

Etihad Airways
23/1
1 total stop
34h 30m total
Sydney to Illinois

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($109 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($33 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Tue 26/1

11:20-23:59

1 stop29h 39m

Lambert-St Louis

Sat 30/1

10:12-11:45

2 stops32h 33m

$1,561

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Wed 4/11

11:50-21:49

2 stops26h 59m

Chicago O'Hare Intl

Mon 9/11

10:34-10:35

2 stops31h 01m

$1,748

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Tue 17/11

11:50-18:09

2 stops23h 19m

Lambert-St Louis

Tue 1/12

13:08-09:05

3 stops26h 57m

$1,756

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Sat 21/11

11:20-16:57

2 stops22h 37m

Lambert-St Louis

Sat 28/11

21:48-07:00

2 stops40h 12m

$1,810

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Tue 13/10

11:20-16:37

2 stops21h 17m

Lambert-St Louis

Thu 5/11

13:08-09:20

2 stops27h 12m

$1,810

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Wed 4/11

15:15-12:55

1 stop38h 40m

Chicago O'Hare Intl

Mon 9/11

14:35-20:50

1 stop37h 15m

$2,046

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Tue 3/11

15:15-12:55

1 stop38h 40m

Chicago O'Hare Intl

Mon 9/11

14:35-20:50

1 stop37h 15m

$2,127

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Thu 1/10

10:10-13:55

1 stop42h 45m

Chicago O'Hare Intl

Thu 8/10

16:15-18:35

2 stops34h 20m

$2,168

SydneyChicago

SYD Sydney Kingsford Smith - ORD Chicago O'Hare Intl

SYDORD

Sydney Kingsford Smith

Tue 8/9

20:45-19:21

2 stops37h 36m

Chicago O'Hare Intl

Wed 23/9

19:00-18:50

2 stops32h 50m

$2,202

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Sun 4/10

11:20-22:30

2 stops27h 10m

Lambert-St Louis

Sun 11/10

09:00-08:00

2 stops31h 00m

$2,232

Flights are sorted by cheapest return flights first.

Deals found on 20/8

Showing 1-10 of 48 resultsSorted by cheapest first

...

Best time to book a flight from Sydney to Illinois

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

SYD-STL

SYD-MDW

SYD-ORD

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Sydney to Illinois

SYD-USIL

SYD-STL

SYD-MDW

SYD-ORD

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

Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $1,441). Flying from Sydney to Illinois in July is currently the most expensive (average of $1,968). 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 Illinois?

Airfare is below average for this route at the moment.

Sydney to Illinois flights typically cost between $1,316 and $2,022 in September.
The cheapest return price found within the last 5 days was $1,156 on Multiple Airlines (8 Sept–22 Sept).

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

To ensure you get the cheapest price possible for a flight from Sydney to Illinois, you should look to book at least 85 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Sydney to Illinois, such as Air New Zealand,Qantas Airways, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Air New Zealand

8.0

Very Good

663 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

Air New Zealand

8.0

Very Good

663 reviews

Air New Zealand

8.0

Very Good

663 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

Qantas Airways

7.5

Good

1,084 reviews

Air New Zealand

8.0

Very Good

663 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

United Airlines

7.4

Good

10,106 reviews

Air New Zealand

8.0

Very Good

663 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

American Airlines

7.1

Good

11,986 reviews

Air New Zealand

8.0

Very Good

663 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

Air Canada

7.1

Good

11,515 reviews

Air New Zealand

8.0

Very Good

663 reviews

Check prices

Reviews

1 / 20

2.0

Mediocre

Viren,June 2026

MEL - LAX

Flight got delayed and made us take a transit visa which was not a told before hand.

Related info for your journey

What airport do you fly from for flights from Sydney to Illinois?
If you book a flight to Illinois from Sydney, you will be flying from Kingsford Smith, which is the city’s only airport. Sydney Kingsford Smith (SYD) is located 7.5 km from the centre of Sydney.
How long is the flight from Sydney to Illinois?
Departing from Sydney to Illinois will take you 23h 19m. The distance between Sydney and Illinois is about 14571 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
What are the most popular routes from Sydney to Illinois?
The most popular route from Sydney to Illinois is Sydney Kingsford Smith - Chicago O'Hare Intl. You may also consider Sydney Kingsford Smith - Chicago Midway or Sydney Kingsford Smith - Lambert-St Louis.
Can I find deals for flights from Sydney to Illinois that include hotel bookings?
Yes. In addition to deals on Sydney to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Sydney to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Sydney to Illinois.
Can I find deals for business class flights from Sydney to Illinois?
Yes. Cheapflights offers flight deals from Sydney to Illinois 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 Illinois?
Currently, September is the cheapest month in which you can book a flight from Sydney to Illinois (average of $1,441). Flying from Sydney to Illinois in July is currently the most expensive (average of $1,968). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

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Top 5 airlines flying from Sydney to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Air Canada	Cheapest$1,064	Average$1,554	FlexibilityNo cancel fee	On-time67%	Search Air Canada flights
American Airlines	Cheapest$1,241	Average$1,593	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Qantas Airways	Cheapest$1,244	Average$1,740	FlexibilityNo cancel fee	On-time74%	Search Qantas Airways flights
Air New Zealand	Cheapest$1,329	Average$1,509	FlexibilityNo cancel fee	On-time78%	Search Air New Zealand flights
United Airlines	Cheapest$1,389	Average$1,804	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

Fly with Cheapflights

How does Cheapflights help users find flights from Sydney to Illinois?

When you search for this flight from Sydney to Illinois, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Sydney to Illinois?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Sydney to Illinois.

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

Yes! Cheapflights helps users easily find flights from Sydney to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Sydney to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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Cheap flights from Sydney to Illinois from $1,003

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/1. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Sydney to Illinois

Cheapest flights from Sydney to IllinoisExplore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Best flights from Sydney to IllinoisDiscover carefully curated flight deals from Sydney to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Discover carefully curated flight deals from Sydney to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Last-minute flights from Sydney to IllinoisDiscover last-minute flight deals from Sydney to Illinois. Data last updated 21 August 2026 and is based on user searches.

Discover last-minute flight deals from Sydney to Illinois. Data last updated 21 August 2026 and is based on user searches.

One-way flights from Sydney to IllinoisSearch for one-way flight options from Sydney to Illinois. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Search for one-way flight options from Sydney to Illinois. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Find flight deals from Sydney to Illinois

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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

Best time to book a flight from Sydney to Illinois

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

Cheapflights Insights

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

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

Airfare is below average for this route at the moment.

Sydney to Illinois flights typically cost between $1,316 and $2,022 in September.The cheapest return price found within the last 5 days was $1,156 on Multiple Airlines (8 Sept–22 Sept).

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

To ensure you get the cheapest price possible for a flight from Sydney to Illinois, you should look to book at least 85 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Reviews of airlines servicing Illinois

Read through reviews of airlines operating flights from Sydney to Illinois, such as Air New Zealand,Qantas Airways, andUnited Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Sydney to Illinois?

How long is the flight from Sydney to Illinois?

What are the most popular routes from Sydney to Illinois?

Can I find deals for flights from Sydney to Illinois that include hotel bookings?

How can I find direct flights from Sydney to Illinois?

Can I find deals for business class flights from Sydney to Illinois?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Sydney to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Complete your trip

Complete your trip to Illinois by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to United States

Book a non-stop flight to one of these other cities located in United States.

Search flights from Sydney to Illinois by cabin class

Find flights from Sydney to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Sydney and Illinois flights

Browse other Sydney and Illinois flight options. Last updated on 21 August 2026.

Popular flight searches

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Sydney to Illinois flights

Consider these flights travelling from Sydney to Illinois.

Top 5 airlines flying from Sydney to Illinois

Fly with Cheapflights

How does Cheapflights help users find flights from Sydney to Illinois?

Why should you use Cheapflights to find cheap flight tickets from Sydney to Illinois?

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

Can Cheapflights notify me if prices for flights from Sydney to Illinois become cheaper?

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Travel Smart

Cheapest flights from Sydney to Illinois
Explore the most affordable flight options available from Sydney to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 August 2026.

Best flights from Sydney to Illinois
Discover carefully curated flight deals from Sydney to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 21 August 2026.

Last-minute flights from Sydney to Illinois
Discover last-minute flight deals from Sydney to Illinois. Data last updated 21 August 2026 and is based on user searches.

One-way flights from Sydney to Illinois
Search for one-way flight options from Sydney to Illinois. Find affordable one-way fares based on user searches. Data last updated 21 August 2026.

Sydney to Illinois flights typically cost between $1,316 and $2,022 in September.
The cheapest return price found within the last 5 days was $1,156 on Multiple Airlines (8 Sept–22 Sept).