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$42+ 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 24/2. 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
27 Feb — 6 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 28 January 2026.

Cheapest one-way flight

$38

Cheapest round-trip flight

$178

Cheapest airline

Alaska Airlines

Most popular destination

Sydney Kingsford Smith (SYD)

Good round-trip deal

$1,573 or less

Good one-way deal

$368 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 San Salvador El Salvador 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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Sydney Kingsford Smith (SYD) is currently the most popular flight destination from Ontario (average return price of $712).
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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 28 January 2026.

Fri 27/221:43
ONT
-
LAS
Nonstop1h 10m
Frontier
Sun 1/320:21
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 27/1$134
Tue 24/208:35
ONT
-
LAS
1 stop5h 31m
Frontier
Fri 27/214:52
LAS
-
ONT
Nonstop1h 09m
Frontier
Deal found 27/1$135
Sat 14/319:31
ONT
-
LAS
Nonstop1h 09m
Frontier
Sat 21/312:17
LAS
-
ONT
Nonstop1h 11m
Frontier
Deal found 27/1$145
Tue 28/400:59
ONT
-
LAS
1 stop12h 12m
Frontier
Tue 5/517:26
LAS
-
ONT
Nonstop1h 08m
Frontier
Deal found 25/1$190
Thu 19/218:08
ONT
-
PDX
Nonstop2h 25m
Alaska Airlines
Mon 23/221:30
PDX
-
ONT
Nonstop2h 22m
Alaska Airlines
Deal found 26/1$226
Sat 21/318:35
ONT
-
PDX
1 stop3h 50m
Southwest
Tue 31/306:30
PDX
-
ONT
1 stop3h 55m
Southwest
Deal found 26/1$233
Tue 10/306:45
ONT
-
LAS
2 stops5h 40m
Southwest
Wed 25/306:05
LAS
-
ONT
1 stop5h 55m
Southwest
Deal found 27/1$233
Thu 19/216:40
ONT
-
PDX
1 stop4h 30m
Southwest
Sun 22/205:00
PDX
-
ONT
1 stop7h 00m
Southwest
Deal found 25/1$240
Sat 14/317:53
ONT
-
PDX
1 stop4h 25m
Delta
Mon 16/319:15
PDX
-
ONT
1 stop4h 36m
Delta
Deal found 27/1$242
Tue 17/220:50
ONT
-
LAS
Nonstop1h 05m
Southwest
Tue 24/209:00
LAS
-
ONT
Nonstop1h 05m
Southwest
Deal found 26/1$246
Fri 20/217:20
ONT
-
PDX
1 stop3h 55m
Southwest
Tue 24/214:25
PDX
-
ONT
2 stops6h 40m
Southwest
Deal found 26/1$248
Fri 27/219:15
ONT
-
LAS
Nonstop1h 05m
Southwest
Mon 2/321:00
LAS
-
ONT
Nonstop1h 05m
Southwest
Deal found 27/1$250

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 28 January 2026. In the last 7 days, Cheapflights users made a total of 647,157 searches

Fly to

Sydney

Route

Depart

Return

Price

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 20/2

18:08-20:33

Nonstop2h 25m

Portland

Sun 22/2

21:30-23:52

Nonstop2h 22m

$226

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 22/4

07:00-09:24

Nonstop2h 24m

Portland

Mon 27/4

21:30-23:48

Nonstop2h 18m

$226

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 19/2

07:00-09:28

Nonstop2h 28m

Portland

Sun 22/2

21:30-23:52

Nonstop2h 22m

$226

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 27/2

07:00-09:28

Nonstop2h 28m

Portland

Mon 2/3

21:30-23:52

Nonstop2h 22m

$226

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 28/2

07:00-09:28

Nonstop2h 28m

Portland

Sun 1/3

21:30-23:52

Nonstop2h 22m

$226

OntarioLas Vegas

ONT - LAS

ONTLAS

Ontario

Tue 10/3

06:45-12:25

2 stops5h 40m

Las Vegas Harry Reid Intl

Wed 25/3

06:05-12:00

1 stop5h 55m

$233

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 24/2

13:50-18:55

1 stop5h 05m

Portland

Tue 3/3

13:40-17:41

1 stop4h 01m

$240

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 26/2

17:25-23:00

1 stop5h 35m

Portland

Thu 5/3

05:50-12:25

1 stop6h 35m

$240

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 5/3

18:30-00:55

1 stop6h 25m

Portland

Sun 8/3

19:45-23:40

1 stop3h 55m

$240

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 4/3

11:15-19:15

1 stop8h 00m

Portland

Sun 8/3

05:00-08:50

1 stop3h 50m

$240

Flights are sorted by cheapest return flights first.

Deals found on 28/1

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, February is the cheapest month in which you can book a flight from Ontario (average of $959). Flying from Ontario in December will prove the most costly (average of $1,146). 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 (82 flights per day), Dallas (73 flights per day) and Atlanta (62 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $328
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,553

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 $328. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $328
Taipei City Taiwan Taoyuan Intl
Taipei City Taiwan Taoyuan Intl
From $1,553

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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 28 January 2026.

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

    For the current month, the most popular flights from Ontario are Guadalajara, 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 $328 to Atlanta (prices may vary depending on the airline and departure time). On average, users have booked flights for $974 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 $1,775 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is February. 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 Melbourne from $1,472 round trip
    Fly from Ontario to Sydney from $1,510 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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