£44+ 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 20/4. 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
5 Apr — 12 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 6 March 2026.

Good round-trip deal

£65 or less

Good one-way deal

£335 or less
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 6 March 2026.

Mon 27/406:00
ONT
-
LHR
2 stops23h 05m
Virgin Atlantic
Wed 13/511:45
LHR
-
ONT
2 stops18h 49m
Virgin Atlantic
Deal found 4/3£469
Wed 1/417:02
ONT
-
MAN
2 stops18h 03m
British Airways
Wed 29/419:50
MAN
-
ONT
2 stops33h 17m
British Airways
Deal found 1/3£500
Tue 18/807:00
ONT
-
EDI
1 stop17h 25m
United Airlines
Tue 25/811:30
EDI
-
ONT
1 stop14h 49m
United Airlines
Deal found 2/3£511
Tue 14/414:08
ONT
-
LHR
1 stop14h 02m
Iberia
Tue 21/406:15
LHR
-
ONT
2 stops22h 39m
Iberia
Deal found 2/3£518
Sun 23/807:00
ONT
-
MAN
2 stops19h 25m
United Airlines
Tue 1/910:35
MAN
-
ONT
2 stops20h 23m
United Airlines
Deal found 3/3£519
Wed 15/406:00
ONT
-
LHR
1 stop20h 00m
Delta
Tue 5/509:55
LHR
-
ONT
2 stops20h 42m
Delta
Deal found 2/3£521
Tue 14/413:29
ONT
-
LHR
2 stops15h 36m
Delta
Tue 21/406:30
LHR
-
ONT
2 stops18h 45m
Delta
Deal found 1/3£524
Wed 15/413:27
ONT
-
LHR
1 stop13h 43m
United Airlines
Tue 5/509:30
LHR
-
ONT
2 stops20h 28m
United Airlines
Deal found 3/3£529
Tue 17/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Tue 31/314:50
LHR
-
ONT
1 stop13h 46m
United Airlines
Deal found 3/3£530
Tue 14/414:20
ONT
-
LGW
2 stops17h 40m
Delta
Tue 21/410:35
LGW
-
ONT
2 stops18h 25m
Delta
Deal found 1/3£530
Tue 24/312:57
ONT
-
LHR
1 stop13h 03m
Multiple Airlines
Tue 31/310:55
LHR
-
ONT
1 stop13h 33m
Multiple Airlines
Deal found 1/3£530
Wed 1/410:56
ONT
-
LHR
1 stop12h 59m
American Airlines
Wed 8/410:05
LHR
-
ONT
1 stop14h 17m
American Airlines
Deal found 2/3£532

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

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 14/4

14:20-16:00

2 stops17h 40m

London Gatwick

Tue 21/4

10:35-21:00

2 stops18h 25m

£530
Fastest return journey

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 24/3

12:57-09:00

1 stop13h 03m

London Heathrow

Tue 31/3

10:55-16:28

1 stop13h 33m

£530

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 17/8

17:38-15:05

1 stop13h 27m

London Heathrow

Tue 25/8

17:00-11:09

1 stop26h 09m

£545

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Tue 18/8

16:54-18:40

2 stops17h 46m

Glasgow Intl

Thu 27/8

08:35-21:28

2 stops20h 53m

£555

OntarioBirmingham

ONT - BHX

ONTBHX

Ontario

Wed 15/4

11:05-17:30

2 stops22h 25m

Birmingham

Wed 22/4

06:05-20:36

2 stops22h 31m

£559

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 21/4

07:00-10:25

2 stops19h 25m

Manchester

Thu 30/4

06:05-22:35

2 stops24h 30m

£560

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 7/4

07:00-10:25

2 stops19h 25m

Manchester

Tue 14/4

06:05-22:31

2 stops24h 26m

£562

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 6/5

14:20-16:00

2 stops17h 40m

London Gatwick

Wed 13/5

10:25-22:34

2 stops20h 09m

£564

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 28/4

14:20-16:00

2 stops17h 40m

London Gatwick

Thu 7/5

10:25-22:34

2 stops20h 09m

£564

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Wed 15/4

14:20-16:00

2 stops17h 40m

London Gatwick

Tue 5/5

10:35-22:37

2 stops20h 02m

£565

Flights are sorted by cheapest return flights first.

Deals found on 2/3

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 £351). Flying from Ontario in June will prove the most costly (average of £524). 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 (52 flights per day), Seattle (48 flights per day) and Phoenix (34 flights per day).

Portland
Portland
From £65
New York
New York
From £335

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Portland, with prices starting at £65. Explore other affordable destinations below.

Portland
Portland
From £65
New York
New York
From £335

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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 6 March 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 £65 to Portland (prices may vary depending on the airline and departure time). On average, users have booked flights for £250 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 £542 round trip
    Travel from Ontario to Edinburgh from £547 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!

See more FAQs

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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