£73+ 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 13/3. 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
15 Mar — 22 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 13 February 2026.

Cheapest one-way flight

£24

Cheapest round-trip flight

£43

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£63 or less

Good one-way deal

£328 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 £84).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £336).
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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 13 February 2026.

Thu 23/719:48
ONT
-
KEF
1 stop30h 37m
Alaska Airlines
Mon 3/819:45
KEF
-
ONT
1 stop22h 34m
Alaska Airlines
Deal found 10/2£447
Tue 10/306:00
ONT
-
LHR
1 stop21h 30m
KLM
Tue 17/306:30
LHR
-
ONT
2 stops17h 43m
KLM
Deal found 10/2£460
Sun 12/412:19
ONT
-
EDI
2 stops22h 26m
British Airways
Mon 20/420:30
EDI
-
ONT
2 stops27h 52m
British Airways
Deal found 10/2£462
Mon 30/305:10
ONT
-
EDI
2 stops42h 10m
Air Canada
Fri 10/409:00
EDI
-
ONT
2 stops40h 47m
Air Canada
Deal found 9/2£464
Tue 21/410:59
ONT
-
MAN
2 stops20h 11m
British Airways
Wed 29/409:20
MAN
-
ONT
2 stops22h 26m
British Airways
Deal found 12/2£467
Wed 22/414:08
ONT
-
LHR
1 stop16h 17m
Iberia
Wed 29/411:30
LHR
-
ONT
2 stops20h 16m
Iberia
Deal found 10/2£472
Sun 12/406:05
ONT
-
EDI
2 stops20h 30m
United Airlines
Tue 21/412:30
EDI
-
ONT
2 stops17h 56m
United Airlines
Deal found 10/2£473
Mon 6/409:53
ONT
-
ABZ
2 stops21h 42m
American Airlines
Fri 17/406:50
ABZ
-
ONT
2 stops17h 32m
American Airlines
Deal found 12/2£473
Sat 25/422:15
ONT
-
EDI
1 stop29h 35m
Delta
Fri 8/509:00
EDI
-
ONT
1 stop20h 54m
Delta
Deal found 13/2£474
Wed 1/417:02
ONT
-
MAN
2 stops20h 43m
British Airways
Wed 8/409:20
MAN
-
ONT
2 stops21h 16m
British Airways
Deal found 9/2£474
Wed 5/816:54
ONT
-
MAN
2 stops18h 11m
British Airways
Wed 19/807:55
MAN
-
ONT
2 stops22h 19m
British Airways
Deal found 11/2£475
Wed 15/411:53
ONT
-
LHR
1 stop19h 42m
Delta
Tue 5/506:30
LHR
-
ONT
2 stops18h 45m
Delta
Deal found 10/2£475

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

Fly to

Heathrow

Route

Depart

Return

Price

OntarioReykjavik

ONT - KEF

ONTKEF

Ontario

Thu 23/7

19:48-09:25

1 stop30h 37m

Reykjavik Keflavik Intl

Mon 3/8

19:45-11:19

1 stop22h 34m

£447

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 30/3

05:10-07:20

2 stops42h 10m

Edinburgh Turnhouse

Fri 10/4

09:00-17:47

2 stops40h 47m

£464

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Sun 12/4

06:05-10:35

2 stops20h 30m

Edinburgh Turnhouse

Tue 21/4

12:30-22:26

2 stops17h 56m

£473

OntarioAberdeen

ONT - ABZ

ONTABZ

Ontario

Mon 6/4

09:53-15:35

2 stops21h 42m

Aberdeen Dyce

Fri 17/4

06:50-16:22

2 stops17h 32m

£473

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Wed 1/4

17:02-21:45

2 stops20h 43m

Manchester

Wed 8/4

09:20-22:36

2 stops21h 16m

£474

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 14/4

16:52-21:35

2 stops20h 43m

Manchester

Tue 21/4

08:35-20:54

2 stops20h 19m

£474

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Wed 5/8

16:54-19:05

2 stops18h 11m

Manchester

Wed 19/8

07:55-22:14

2 stops22h 19m

£475

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 15/4

11:53-12:10

1 stop16h 17m

London Heathrow

Tue 5/5

09:55-22:37

2 stops20h 42m

£476

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Sat 11/4

07:00-10:35

2 stops43h 35m

Edinburgh Turnhouse

Tue 21/4

12:30-22:26

2 stops17h 56m

£477

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Sun 12/4

16:52-21:30

2 stops20h 38m

Manchester

Tue 21/4

20:05-18:37

2 stops30h 32m

£481

Flights are sorted by cheapest return flights first.

Deals found on 10/2

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, December is the cheapest month in which you can book a flight from Ontario (average of £344). Flying from Ontario in June will prove the most costly (average of £513). 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 (98 flights per day), Seattle (69 flights per day) and Atlanta (63 flights per day).

Portland
Portland
From £63
New York
New York
From £328

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Portland, with prices starting at £63. Explore other affordable destinations below.

Portland
Portland
From £63
New York
New York
From £328

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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 13 February 2026.

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

    This month, the top selected destinations from Ontario are Dallas/Fort Worth Airport, Denver, Guadalajara. 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 £63 to Portland (prices may vary depending on the airline and departure time). On average, users have booked flights for £196 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 £475 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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