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£60+ 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 17/2. 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 — LHR
21 Feb — 28 Feb1
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 22 January 2026.

Cheapest one-way flight

£24

Cheapest round-trip flight

£37

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£64 or less

Good one-way deal

£333 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 £85).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £453).
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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 22 January 2026.

Tue 17/217:00
ONT
-
SEA
1 stop7h 09m
Delta
Fri 27/219:00
SEA
-
ONT
1 stop4h 49m
Delta
Deal found 20/1£89
Thu 12/316:02
ONT
-
SEA
Nonstop2h 50m
Alaska Airlines
Tue 17/308:30
SEA
-
ONT
Nonstop2h 38m
Alaska Airlines
Deal found 21/1£95
Fri 27/212:02
ONT
-
SEA
Nonstop2h 50m
Alaska Airlines
Mon 2/320:56
SEA
-
ONT
Nonstop2h 36m
Alaska Airlines
Deal found 20/1£96
Sat 28/216:02
ONT
-
SEA
Nonstop2h 50m
Alaska Airlines
Sun 1/308:30
SEA
-
ONT
Nonstop2h 38m
Alaska Airlines
Deal found 20/1£97
Fri 24/415:26
ONT
-
SEA
Nonstop2h 51m
Alaska Airlines
Wed 29/411:38
SEA
-
ONT
Nonstop2h 54m
Alaska Airlines
Deal found 20/1£100
Wed 18/206:14
ONT
-
SEA
Nonstop2h 55m
Alaska Airlines
Thu 19/220:56
SEA
-
ONT
Nonstop2h 36m
Alaska Airlines
Deal found 21/1£103
Tue 24/306:00
ONT
-
SEA
Nonstop2h 55m
Delta
Wed 1/414:30
SEA
-
ONT
Nonstop2h 43m
Delta
Deal found 20/1£110
Tue 17/217:00
ONT
-
SEA
1 stop7h 09m
Delta
Thu 19/219:55
SEA
-
ONT
Nonstop2h 42m
Delta
Deal found 20/1£111
Fri 13/315:05
ONT
-
SEA
1 stop7h 30m
Southwest
Mon 16/315:45
SEA
-
ONT
1 stop6h 20m
Southwest
Deal found 21/1£112
Tue 24/313:40
ONT
-
SEA
1 stop8h 50m
Southwest
Wed 25/309:50
SEA
-
ONT
2 stops6h 40m
Southwest
Deal found 21/1£116
Sat 14/215:30
ONT
-
SEA
Nonstop3h 03m
Delta
Sat 21/211:15
SEA
-
ONT
Nonstop2h 39m
Delta
Deal found 20/1£117
Sat 14/216:02
ONT
-
SEA
Nonstop2h 50m
Alaska Airlines
Mon 23/208:30
SEA
-
ONT
Nonstop2h 38m
Alaska Airlines
Deal found 20/1£118

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 22 January 2026. In the last 7 days, Cheapflights users made a total of 858,174 searches

Fly to

Heathrow

Route

Depart

Return

Price

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 12/3

16:02-18:52

Nonstop2h 50m

Seattle/Tacoma Intl

Sat 14/3

20:56-23:32

Nonstop2h 36m

£95

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 1/4

06:00-08:54

Nonstop2h 54m

Seattle/Tacoma Intl

Tue 7/4

07:00-09:39

Nonstop2h 39m

£95

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Wed 25/2

12:02-14:52

Nonstop2h 50m

Seattle/Tacoma Intl

Sat 28/2

20:56-23:32

Nonstop2h 36m

£95

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 14/2

12:02-14:52

Nonstop2h 50m

Seattle/Tacoma Intl

Sat 21/2

20:56-23:32

Nonstop2h 36m

£95

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 5/5

06:00-08:50

Nonstop2h 50m

Seattle/Tacoma Intl

Thu 7/5

07:05-09:45

Nonstop2h 40m

£103

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Sat 14/2

06:14-09:09

Nonstop2h 55m

Seattle/Tacoma Intl

Sat 14/3

20:56-23:32

Nonstop2h 36m

£117

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 17/2

17:00-00:09

1 stop7h 09m

Seattle/Tacoma Intl

Fri 20/2

19:00-23:49

1 stop4h 49m

£118

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Fri 24/4

07:30-10:38

Nonstop3h 08m

Seattle/Tacoma Intl

Tue 28/4

16:36-23:44

1 stop7h 08m

£125

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Tue 17/2

15:30-18:33

Nonstop3h 03m

Seattle/Tacoma Intl

Mon 23/2

16:40-23:49

1 stop7h 09m

£125

OntarioSeattle

ONT - SEA

ONTSEA

Ontario

Thu 26/2

07:30-10:34

Nonstop3h 04m

Seattle/Tacoma Intl

Sun 1/3

05:30-12:07

1 stop6h 37m

£125

Flights are sorted by cheapest return flights first.

Deals found on 21/1

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.

When is the best time to book a flight from Ontario?

Use this chart to determine the optimal time to book a return flight from Ontario to Heathrow. Price data was last updated on 16 January 2026.

Booking 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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 £349). Flying from Ontario in June will prove the most costly (average of £520). 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?

If you’re flying from Ontario, these routes are more frequently taken by airlines Dallas (96 flights per day), Seattle (82 flights per day) and Phoenix (76 flights per day).

Portland
Portland
From £64
New York
New York
From £333

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Portland, with prices starting at £64. Explore other affordable destinations below.

Portland
Portland
From £64
New York
New York
From £333

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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 22 January 2026.

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

    This month, the top selected destinations from Ontario are Guadalajara, Dallas/Fort Worth Airport, Honolulu. Throughout the year, Dallas/Fort Worth Airport, Denver, Guadalajara are some of the top choices made by users flying from Ontario.

  • What is the cheapest flight from Ontario to anywhere?

    Users have flown out of Ontario for as low as £64 to Portland (prices may vary depending on the airline and departure time). On average, users have booked flights for £199 to fly from Ontario.

  • What is the cheapest month to fly from Ontario?

    At the present moment the cheapest month to fly from Ontario is currently December; with June being the most expensive. Prices will vary depending on multiple factors such as booking in advance, airline and departure airports and times.

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

    Check out the cheapest flights from Ontario to embark to:
    Travel from Ontario to London from £446 round trip

  • How does Cheapflights help users find flights from Ontario?

    Deals for flights from Ontario are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

  • 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?

    Yes! Cheapflights helps users easily find flights from Ontario with no change fees.

  • 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?

Deals for flights from Ontario are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose to your preference, such as price, airport, cabin class, and plenty of other options.

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?

Yes! Cheapflights helps users easily find flights from Ontario with no change fees.

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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