£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 16/3. 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
2 Mar — 9 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 31 January 2026.

Cheapest one-way flight

£24

Cheapest round-trip flight

£36

Cheapest airline

Alaska Airlines

Most popular destination

Las Vegas Harry Reid Intl (LAS)

Good round-trip deal

£63 or less

Good one-way deal

£327 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 £83).
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Las Vegas Harry Reid Intl (LAS) is currently the most popular flight destination from Ontario (average return price of £72).
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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 31 January 2026.

Thu 5/307:30
ONT
-
LHR
1 stop20h 25m
Delta
Thu 12/306:30
LHR
-
ONT
2 stops17h 42m
Delta
Deal found 30/1£464
Sun 1/307:30
ONT
-
LHR
1 stop19h 00m
KLM
Sun 8/306:30
LHR
-
ONT
2 stops23h 03m
KLM
Deal found 30/1£464
Sun 1/322:20
ONT
-
LHR
2 stops25h 45m
Delta
Sun 8/306:30
LHR
-
ONT
2 stops23h 03m
Delta
Deal found 30/1£467
Mon 2/314:39
ONT
-
EDI
2 stops18h 21m
British Airways
Mon 9/319:20
EDI
-
ONT
2 stops30h 22m
British Airways
Deal found 29/1£468
Tue 17/313:50
ONT
-
LHR
1 stop12h 50m
United Airlines
Tue 24/306:30
LHR
-
ONT
2 stops18h 11m
United Airlines
Deal found 31/1£472
Sun 5/417:02
ONT
-
EDI
2 stops17h 43m
British Airways
Tue 14/418:05
EDI
-
ONT
2 stops32h 32m
British Airways
Deal found 29/1£475
Wed 15/417:55
ONT
-
LHR
1 stop13h 40m
Delta
Tue 5/506:30
LHR
-
ONT
2 stops18h 45m
Delta
Deal found 30/1£475
Wed 8/413:20
ONT
-
LHR
1 stop12h 40m
Delta
Thu 23/406:30
LHR
-
ONT
2 stops18h 45m
Delta
Deal found 30/1£475
Tue 3/314:39
ONT
-
LHR
1 stop13h 01m
British Airways
Tue 10/314:20
LHR
-
ONT
1 stop14h 47m
British Airways
Deal found 30/1£477
Mon 2/314:39
ONT
-
LHR
1 stop13h 01m
British Airways
Mon 9/314:25
LHR
-
ONT
1 stop14h 42m
British Airways
Deal found 31/1£478
Wed 8/413:20
ONT
-
LHR
2 stops17h 40m
Virgin Atlantic
Wed 15/411:45
LHR
-
ONT
2 stops18h 52m
Virgin Atlantic
Deal found 31/1£479
Sun 19/412:19
ONT
-
EDI
2 stops22h 26m
British Airways
Mon 27/420:30
EDI
-
ONT
2 stops27h 52m
British Airways
Deal found 28/1£480

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

Fly to

Heathrow

Route

Depart

Return

Price

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 2/3

14:39-17:00

2 stops18h 21m

Edinburgh Turnhouse

Mon 9/3

19:20-18:42

2 stops30h 22m

£468

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 18/3

13:40-12:00

1 stop15h 20m

London Heathrow

Wed 25/3

09:30-22:36

2 stops20h 06m

£472

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 7/4

13:20-11:00

1 stop13h 40m

London Heathrow

Wed 22/4

06:30-17:15

2 stops18h 45m

£475

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Sun 5/4

17:02-18:45

2 stops17h 43m

Edinburgh Turnhouse

Tue 14/4

18:05-18:37

2 stops32h 32m

£475

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Mon 16/3

23:59-10:20

2 stops27h 21m

Manchester

Mon 23/3

06:00-22:57

2 stops23h 57m

£480

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 4/5

14:08-16:35

2 stops18h 27m

Edinburgh Turnhouse

Thu 14/5

21:10-16:22

2 stops27h 12m

£481

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Wed 1/4

07:00-10:25

2 stops19h 25m

Manchester

Tue 7/4

10:35-22:26

2 stops19h 51m

£484

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 2/3

13:50-12:00

1 stop14h 10m

London Heathrow

Wed 11/3

10:05-17:41

1 stop14h 36m

£485

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 27/2

13:50-12:00

1 stop14h 10m

London Heathrow

Wed 4/3

10:05-17:41

1 stop15h 36m

£485

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 12/3

13:40-12:00

1 stop15h 20m

London Heathrow

Mon 16/3

10:05-17:41

1 stop14h 36m

£485

Flights are sorted by cheapest return flights first.

Deals found on 29/1

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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 30 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 £342). Flying from Ontario in June will prove the most costly (average of £511). 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 (83 flights per day), Atlanta (61 flights per day) and Seattle (60 flights per day).

Portland
Portland
From £63
New York
New York
From £327

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 £327

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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 31 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 £63 to Portland (prices may vary depending on the airline and departure time). On average, users have booked flights for £195 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 £464 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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