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$112+ 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 13/5. 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 — LHR
3 Apr — 10 Apr1
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 4 March 2026.

Cheapest one-way flight

$35

Cheapest round-trip flight

$496

Cheapest airline

Frontier

Most popular destination

Las Vegas Harry Reid Intl (LAS)

Good round-trip deal

$1,550 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 San Salvador El Salvador Intl.
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On average, Frontier currently has the cheapest one-way flight from Ontario (avg. price of $299).
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Las Vegas Harry Reid Intl (LAS) is currently the most popular flight destination from Ontario (average return price of $122).
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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 4 March 2026.

Wed 15/417:49
ONT
-
PDX
Nonstop2h 27m
Alaska Airlines
Tue 21/414:48
PDX
-
ONT
Nonstop2h 21m
Alaska Airlines
Deal found 3/3$223
Sat 2/505:30
ONT
-
PDX
2 stops7h 25m
Southwest
Sat 9/507:00
PDX
-
ONT
1 stop5h 15m
Southwest
Deal found 2/3$230
Tue 14/407:00
ONT
-
PDX
Nonstop2h 28m
Alaska Airlines
Mon 20/414:48
PDX
-
ONT
Nonstop2h 21m
Alaska Airlines
Deal found 3/3$237
Sat 2/512:55
ONT
-
PDX
1 stop5h 55m
Southwest
Sun 3/505:50
PDX
-
ONT
1 stop5h 15m
Southwest
Deal found 2/3$244
Fri 17/417:49
ONT
-
PDX
Nonstop2h 27m
Alaska Airlines
Mon 20/414:48
PDX
-
ONT
Nonstop2h 21m
Alaska Airlines
Deal found 2/3$251
Wed 15/417:49
ONT
-
PDX
Nonstop2h 27m
Alaska Airlines
Sat 18/407:15
PDX
-
ONT
1 stop8h 27m
Alaska Airlines
Deal found 1/3$255
Wed 29/415:45
ONT
-
PDX
1 stop6h 40m
Southwest
Sat 2/513:35
PDX
-
ONT
2 stops7h 10m
Southwest
Deal found 4/3$258
Sat 4/407:00
ONT
-
PDX
Nonstop2h 28m
Alaska Airlines
Sun 19/408:00
PDX
-
ONT
Nonstop2h 19m
Alaska Airlines
Deal found 3/3$265
Tue 28/407:00
ONT
-
PDX
Nonstop2h 24m
Alaska Airlines
Sat 2/508:45
PDX
-
ONT
1 stop25h 00m
Alaska Airlines
Deal found 1/3$269
Mon 23/316:25
ONT
-
PDX
2 stops6h 00m
Southwest
Fri 27/318:40
PDX
-
ONT
1 stop5h 30m
Southwest
Deal found 3/3$272
Sat 25/413:27
ONT
-
PDX
1 stop4h 41m
United Airlines
Mon 8/605:15
PDX
-
ONT
1 stop6h 57m
United Airlines
Deal found 27/2$274
Fri 3/417:49
ONT
-
PDX
Nonstop2h 27m
Alaska Airlines
Mon 6/417:58
PDX
-
ONT
Nonstop2h 25m
Alaska Airlines
Deal found 2/3$279

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

Fly to

Route

Depart

Return

Price

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Wed 13/5

07:00-09:24

Nonstop2h 24m

Portland

Mon 18/5

21:31-23:56

Nonstop2h 25m

$251

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 16/4

07:00-09:28

Nonstop2h 28m

Portland

Tue 21/4

17:58-20:23

Nonstop2h 25m

$251

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 24/4

07:00-09:24

Nonstop2h 24m

Portland

Tue 28/4

08:45-14:32

1 stop5h 47m

$322

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 21/4

13:27-18:07

1 stop4h 40m

Portland

Sat 25/4

05:00-17:47

2 stops12h 47m

$343

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 21/5

17:05-00:25

1 stop7h 20m

Portland

Mon 25/5

05:30-10:25

1 stop4h 55m

$352

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Tue 24/3

07:00-09:28

Nonstop2h 28m

Portland

Wed 25/3

07:15-15:42

1 stop8h 27m

$354

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Sat 11/4

18:25-20:47

1 stop26h 22m

Portland

Fri 24/4

21:30-23:48

Nonstop2h 18m

$354

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Fri 17/4

11:05-18:07

1 stop7h 02m

Portland

Sat 25/4

05:00-17:47

2 stops12h 47m

$357

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Mon 15/6

10:54-13:11

Nonstop2h 17m

Portland

Tue 16/6

07:36-09:59

Nonstop2h 23m

$393

OntarioPortland

ONT - PDX

ONTPDX

Ontario

Thu 28/5

07:00-09:24

Nonstop2h 24m

Portland

Mon 1/6

17:46-23:58

1 stop6h 12m

$407

Flights are sorted by cheapest return flights first.

Deals found on 28/2

Showing 1-10 of 60 resultsSorted by cheapest first
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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, December is the cheapest month in which you can book a flight from Ontario (average of $665). Flying from Ontario in June will prove the most costly (average of $992). 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 (80 flights per day), Seattle (74 flights per day) and Atlanta (50 flights per day).

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $324
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 $324. Explore other affordable destinations below.

Atlanta Hartsfield-Jackson
Atlanta Hartsfield-Jackson
From $324
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 4 March 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 $324 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 $1,748 for this destination.

  • What is the cheapest month to fly from Ontario?

    Currently, the cheapest month for flights from Ontario is December. The most expensive month for flights is June. 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 London from $987 round trip
    Fly from Ontario to Melbourne from $1,492 round trip
    Fly from Ontario to Sydney from $1,494 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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