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$41+ Cheap flights from Ontario

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 25/2. 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
12 Mar — 19 Mar1
1 adult
1 adult, Economy, 0 bags

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 10 February 2026.

Cheapest one-way flight

$38

Cheapest round-trip flight

$79

Cheapest airline

Alaska Airlines

Most popular destination

Las Vegas Harry Reid Intl (LAS)

Good round-trip deal

$1,549 or less

Good one-way deal

$362 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 $176).
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Las Vegas Harry Reid Intl (LAS) is currently the most popular flight destination from Ontario (average return price of $120).
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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

Enter your travel dates to find the best prices.

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 10 February 2026.

Tue 10/314:23
ONT
-
LAS
Nonstop1h 14m
Frontier
Tue 17/312:17
LAS
-
ONT
Nonstop1h 11m
Frontier
Deal found 8/2$84
Tue 21/414:44
ONT
-
LAS
Nonstop1h 12m
Frontier
Thu 23/418:59
LAS
-
ONT
Nonstop1h 05m
Frontier
Deal found 8/2$109
Wed 25/219:17
ONT
-
LAS
Nonstop1h 09m
Frontier
Sun 1/312:00
LAS
-
ONT
Nonstop1h 11m
Frontier
Deal found 7/2$113
Sun 5/410:50
ONT
-
LAS
Nonstop1h 13m
Frontier
Sun 12/416:06
LAS
-
ONT
Nonstop1h 09m
Frontier
Deal found 10/2$194
Sat 28/318:37
ONT
-
LAS
1 stop4h 05m
United Airlines
Tue 31/313:43
LAS
-
ONT
1 stop4h 19m
United Airlines
Deal found 8/2$217
Tue 5/514:10
ONT
-
LAS
Nonstop1h 05m
Southwest
Tue 5/521:10
LAS
-
ONT
Nonstop1h 00m
Southwest
Deal found 9/2$218
Wed 4/317:50
ONT
-
LAS
1 stop4h 10m
Southwest
Wed 11/312:35
LAS
-
ONT
2 stops5h 45m
Southwest
Deal found 8/2$230
Tue 31/306:45
ONT
-
LAS
1 stop4h 15m
Southwest
Tue 31/321:35
LAS
-
ONT
Nonstop1h 00m
Southwest
Deal found 9/2$232
Tue 14/400:59
ONT
-
DCA
1 stop13h 00m
Frontier
Sat 18/413:59
DCA
-
ONT
1 stop12h 56m
Frontier
Deal found 9/2$286
Sat 16/511:44
ONT
-
JFK
1 stop15h 46m
Frontier
Wed 20/507:30
JFK
-
ONT
1 stop9h 10m
Frontier
Deal found 7/2$313
Tue 14/400:59
ONT
-
DCA
1 stop13h 00m
Frontier
Fri 17/418:00
DCA
-
ONT
1 stop8h 55m
Frontier
Deal found 9/2$317
Sat 16/523:25
ONT
-
JFK
Nonstop5h 25m
Multiple Airlines
Wed 20/507:30
JFK
-
ONT
1 stop9h 10m
Multiple Airlines
Deal found 7/2$356

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 10 February 2026. 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

Mon 9/3

21:55-23:00

Nonstop1h 05m

Las Vegas Harry Reid Intl

Wed 11/3

12:35-18:20

2 stops5h 45m

$240

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 30/4

21:55-23:00

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 4/5

19:35-20:40

Nonstop1h 05m

$242

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 11/3

18:35-22:25

1 stop3h 50m

Las Vegas Harry Reid Intl

Thu 12/3

06:15-10:35

1 stop4h 20m

$247

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Sat 21/3

21:45-22:50

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 23/3

18:05-22:25

1 stop4h 20m

$257

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Thu 5/3

17:20-20:50

1 stop3h 30m

Las Vegas Harry Reid Intl

Sat 7/3

05:35-09:05

1 stop3h 30m

$271

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Wed 22/4

17:20-22:40

1 stop5h 20m

Las Vegas Harry Reid Intl

Sat 25/4

13:25-19:10

2 stops5h 45m

$296

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Mon 30/3

18:49-23:11

1 stop4h 22m

Las Vegas Harry Reid Intl

Fri 3/4

15:53-22:45

1 stop6h 52m

$312

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 27/3

21:55-23:00

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 30/3

20:20-00:10

1 stop3h 50m

$313

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 20/3

21:55-23:00

Nonstop1h 05m

Las Vegas Harry Reid Intl

Mon 23/3

18:05-22:25

1 stop4h 20m

$313

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Fri 10/4

05:15-08:20

1 stop3h 05m

Las Vegas Harry Reid Intl

Sat 11/4

05:40-11:05

1 stop5h 25m

$313

Flights are sorted by cheapest return flights first.

Deals found on 9/2

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, August is the cheapest month in which you can book a flight from Ontario (average of $944). Flying from Ontario in December will prove the most costly (average of $1,127). 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 Dallas (83 flights per day), Seattle (67 flights per day) and Phoenix (65 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $323
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,529

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Atlanta Hartsfield-Jackson, with prices starting at $323. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $323
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,529

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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 10 February 2026.

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

    For the current month, the most popular flights from Ontario are Dallas/Fort Worth Airport, Denver, Guadalajara. 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 $323 to Atlanta (prices may vary depending on the airline and departure time). On average, users have booked flights for $959 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 $1,747 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is August. 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 $1,488 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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