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$119+ Cheap flights from Ontario

This is the cheapest return flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/8. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
ONT — SYD
23 Jul — 30 Jul1
1 adult

What to know about flights from Ontario

Discover essential information about flights departing from Ontario, including flight schedules, destinations, airlines operating at the Ontario airport, and any specific guidelines or requirements for travellers. Please note that the information is based on the most recent updates available. Data last updated 18 July 2025.

Cheapest one-way flight

$41

Cheapest round-trip flight

$89

Cheapest airline

Alaska Airlines

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,686 or less

Good one-way deal

$682 or less
The cheapest one-way flight from Ontario is currently to Las Vegas Harry Reid Intl.
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The cheapest round-trip flight from Ontario is currently to Las Vegas Harry Reid Intl.
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On average, Alaska Airlines currently has the cheapest one-way flight from Ontario (avg. price of $209).
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Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $1,549).
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Price to beat on a round-trip flight from Ontario.
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Price to beat on a one-way flight from Ontario.
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Find flights from Ontario

Cheapest flights from Ontario
Explore the most affordable flight options available from Ontario. Find the lowest fares based on data from user searches, with prices last updated on 18 July 2025.

Wed 13/814:10ONT - LAS
Nonstop1h 10mSouthwest
Wed 20/819:40LAS - ONT
Nonstop1h 05mSouthwest
Deal found 18/7$119
Tue 12/807:00ONT - LAS
Nonstop1h 11mFrontier
Fri 15/810:43LAS - ONT
Nonstop1h 10mFrontier
Deal found 18/7$128
Sat 4/1007:10ONT - PDX
Nonstop2h 20mAlaska Airlines
Wed 15/1021:30PDX - ONT
Nonstop2h 21mAlaska Airlines
Deal found 17/7$211
Tue 26/806:00ONT - PDX
1 stop4h 57mHawaiian Airlines
Wed 3/907:03PDX - ONT
Nonstop2h 23mHawaiian Airlines
Deal found 17/7$227
Wed 13/818:39ONT - PDX
1 stop5h 56mUnited Airlines
Wed 20/813:45PDX - ONT
1 stop6h 48mUnited Airlines
Deal found 16/7$245
Sat 13/905:45ONT - PDX
1 stop6h 50mSouthwest
Wed 17/914:25PDX - ONT
2 stops6h 20mSouthwest
Deal found 17/7$250
Sat 16/806:00ONT - PDX
1 stop6h 55mDelta
Wed 20/817:05PDX - ONT
1 stop6h 35mDelta
Deal found 17/7$267
Mon 1/923:59ONT - LHR
1 stop25h 31mJetBlue
Mon 8/911:55LHR - ONT
1 stop17h 34mJetBlue
Deal found 18/7$279
Thu 28/812:45ONT - CLE
1 stop7h 25mSouthwest
Mon 1/905:50CLE - ONT
1 stop8h 45mSouthwest
Deal found 18/7$474
Thu 28/811:45ONT - CLE
1 stop9h 55mDelta
Sun 31/806:00CLE - ONT
1 stop7h 20mDelta
Deal found 17/7$495
Tue 21/1019:47ONT - CLE
1 stop20h 16mAlaska Airlines
Sat 25/1019:57CLE - ONT
1 stop18h 08mAlaska Airlines
Deal found 17/7$500
Sat 27/906:00ONT - CLE
1 stop8h 54mHawaiian Airlines
Tue 30/907:00CLE - ONT
1 stop10h 12mHawaiian Airlines
Deal found 16/7$541

Find flights from Ontario within your budget

Find flights departing from Ontario that match your specified budget. Filter results by price range, allowing you to narrow down options and find flights that fit within your financial constraints. Please note that the search results are based on data from user searches, with fares last updated on 18 July 2025. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 21/8

06:50-11:30

1 stop4h 40m

Las Vegas Harry Reid Intl

Sun 24/8

07:35-08:35

Nonstop1h 00m

$207

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 4/10

07:10-09:30

Nonstop2h 20m

Portland

Wed 15/10

21:30-23:51

Nonstop2h 21m

$211

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 26/8

06:00-10:57

1 stop4h 57m

Portland

Wed 3/9

07:03-09:26

Nonstop2h 23m

$227

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 30/7

19:22-20:35

Nonstop1h 13m

Las Vegas Harry Reid Intl

Mon 11/8

00:59-09:09

1 stop8h 10m

$238

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 16/8

06:00-12:55

1 stop6h 55m

Portland

Sat 23/8

05:30-10:50

1 stop5h 20m

$242

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 13/8

18:39-00:35

1 stop5h 56m

Portland

Wed 20/8

13:45-20:33

1 stop6h 48m

$245

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 13/9

05:45-12:35

1 stop6h 50m

Portland

Wed 17/9

14:25-20:45

2 stops6h 20m

$250

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 1/9

23:59-09:30

1 stop25h 31m

London Heathrow

Mon 8/9

11:55-21:29

1 stop17h 34m

$279

OntarioCleveland

ONT - CLE

ONTCLE

Ontario

Thu 28/8

12:45-23:10

1 stop7h 25m

Cleveland Hopkins Intl

Mon 1/9

05:50-11:35

1 stop8h 45m

$474

OntarioCleveland

ONT - CLE

ONTCLE

Ontario

Thu 28/8

11:45-00:40

1 stop9h 55m

Cleveland Hopkins Intl

Sun 31/8

06:00-10:20

1 stop7h 20m

$495

Flights are sorted by cheapest return flights first.

Deals found on 17/7

Showing 1-10 of 60 results
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Best time to book a flight from Ontario

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

Travel insights for flights from Ontario

Get recent, data-driven insights about flights from Ontario including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Ontario?

Currently, April is the cheapest month in which you can book a flight from Ontario (average of $745). Flying from Ontario in December will prove the most costly (average of $1,357). There are multiple factors that influence the price of a flight so comparing airlines, departure airports and times can help keep costs down.

What are popular destinations to fly to from Ontario?

Ontario offers frequent flights to Seattle (150 flights per day), Dallas (128 flights per day) and Atlanta (81 flights per day).

Dallas/Fort Worth
Dallas/Fort Worth
From $126
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,079

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Dallas/Fort Worth, with prices starting at $195. Explore other affordable destinations below.

Dallas/Fort Worth
Dallas/Fort Worth
From $126
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,079

Airline reviews for flights from Ontario

Get insights into the airlines that provide service from Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing airline for your flight from Ontario. In the last 7 days, Cheapflights users made a total of 647,157 searches.
Read reviews from past customers who have flown Asiana Airlines, Alaska Airlines, andHawaiian Airlines from Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Asiana Airlines
8.2
Very Good
456 reviews
Check prices

Crew

8.6

Entertainment

7.7

Food

8.0

Boarding

8.4

Comfort

8.1

Overall

8.2

Reviews

1 / 20
10.0
Excellent

Jacob,July 2025

ICN - JFK

I flew business calls Asiana, everything was great and good! I must say that the service at the Asian business class lounge prior to the flight is very poor, the staff are very cold and not welcome and I asked for some help in getting a food without salt ...I was looked upon as if I ... I am traveling a lot business , and I se people complained a lot in asiana lounge services. Jacob
Asiana Airlines
8.2
Very Good
456 reviews
Asiana Airlines
8.2
Very Good
456 reviews
Check prices

Crew

8.6

Entertainment

7.7

Food

8.0

Boarding

8.4

Comfort

8.1

Overall

8.2

Reviews

1 / 20
10.0
Excellent

Jacob,July 2025

ICN - JFK

I flew business calls Asiana, everything was great and good! I must say that the service at the Asian business class lounge prior to the flight is very poor, the staff are very cold and not welcome and I asked for some help in getting a food without salt ...I was looked upon as if I ... I am traveling a lot business , and I se people complained a lot in asiana lounge services. Jacob
Alaska Airlines
8.0
Very Good
10,000 reviews
Asiana Airlines
8.2
Very Good
456 reviews
Check prices

Crew

8.6

Entertainment

7.7

Food

8.0

Boarding

8.4

Comfort

8.1

Overall

8.2

Reviews

1 / 20
10.0
Excellent

Jacob,July 2025

ICN - JFK

I flew business calls Asiana, everything was great and good! I must say that the service at the Asian business class lounge prior to the flight is very poor, the staff are very cold and not welcome and I asked for some help in getting a food without salt ...I was looked upon as if I ... I am traveling a lot business , and I se people complained a lot in asiana lounge services. Jacob
Hawaiian Airlines
7.8
Good
2,583 reviews
Asiana Airlines
8.2
Very Good
456 reviews
Check prices

Crew

8.6

Entertainment

7.7

Food

8.0

Boarding

8.4

Comfort

8.1

Overall

8.2

Reviews

1 / 20
10.0
Excellent

Jacob,July 2025

ICN - JFK

I flew business calls Asiana, everything was great and good! I must say that the service at the Asian business class lounge prior to the flight is very poor, the staff are very cold and not welcome and I asked for some help in getting a food without salt ...I was looked upon as if I ... I am traveling a lot business , and I se people complained a lot in asiana lounge services. Jacob
United Airlines
7.4
Good
8,865 reviews
Asiana Airlines
8.2
Very Good
456 reviews
Check prices

Crew

8.6

Entertainment

7.7

Food

8.0

Boarding

8.4

Comfort

8.1

Overall

8.2

Reviews

1 / 20
10.0
Excellent

Jacob,July 2025

ICN - JFK

I flew business calls Asiana, everything was great and good! I must say that the service at the Asian business class lounge prior to the flight is very poor, the staff are very cold and not welcome and I asked for some help in getting a food without salt ...I was looked upon as if I ... I am traveling a lot business , and I se people complained a lot in asiana lounge services. Jacob
American Airlines
7.2
Good
10,000 reviews
Asiana Airlines
8.2
Very Good
456 reviews
Check prices

Crew

8.6

Entertainment

7.7

Food

8.0

Boarding

8.4

Comfort

8.1

Overall

8.2

Reviews

1 / 20
10.0
Excellent

Jacob,July 2025

ICN - JFK

I flew business calls Asiana, everything was great and good! I must say that the service at the Asian business class lounge prior to the flight is very poor, the staff are very cold and not welcome and I asked for some help in getting a food without salt ...I was looked upon as if I ... I am traveling a lot business , and I se people complained a lot in asiana lounge services. Jacob

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Related info for your journey

Access useful and relevant information related to your journey from Ontario. This can include details such as airport transportation, visa requirements, travel insurance, luggage regulations, and any other information that can ensure a smooth and hassle-free travel experience. Please note that the information is based on general guidance and may need to be verified with official sources. Data last updated 18 July 2025.

  • What are the most popular destinations to fly to from Ontario?

    For the current month, the most popular flights from Ontario are Denver, Dallas/Fort Worth Airport, Honolulu. Dallas/Fort Worth Airport, Denver, Guadalajara are the most popular locations from Ontario year round.

  • What is the cheapest flight from Ontario to anywhere?

    Users have flown out of Ontario for as low as $195 to Dallas/Fort Worth Airport (prices may vary depending on the airline and departure time). On average, users have booked flights for $1,218 to fly from Ontario.

  • What is the cheapest first class flight from Ontario?

    If you’re looking to fly first-class from Ontario to anywhere, put Denver on your list as prices start at $1,902 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is April. The most expensive month for flights is December. The cheapest prices are shown above but prices will vary according to departure times, airlines, class and how early you book.

  • Where are the cheapest places to fly to from Ontario?

    View the cheapest flight destinations from Ontario:
    Fly from Ontario to Sydney from $1,669 round trip
    Fly from Ontario to Melbourne from $1,999 round trip

  • How does Cheapflights help users find flights from Ontario?

    Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

  • Why should you use Cheapflights to find cheap flight tickets from Ontario?

    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 Ontario.

  • Can Cheapflights find flights from Ontario with no change fees?

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

  • Can Cheapflights notify me if prices for flights from Ontario become cheaper?

    Yes, Cheapflights has a feature called Price Alerts, which offers users the ability to be notified when flight prices change. Track prices for your flight from Ontario today and book when you’re ready!

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ontario?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Ontario. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

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 Ontario.

Can Cheapflights find flights from Ontario with no change fees?

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

Can Cheapflights notify me if prices for flights from Ontario become cheaper?

Yes, Cheapflights has a feature called Price Alerts, which offers users the ability to be notified when flight prices change. Track prices for your flight from Ontario today and book when you’re ready!

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