£88+ 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 6/2. 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
3 Feb — 10 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 4 January 2026.

Cheapest one-way flight

£20

Cheapest round-trip flight

£18

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£64 or less

Good one-way deal

£332 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 £430).
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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 January 2026.

Tue 24/214:39ONT - GLA
2 stops18h 16mBritish Airways
Mon 2/311:35GLA - ONT
2 stops18h 32mBritish Airways
Deal found 1/1£452
Fri 13/217:02ONT - EDI
2 stops15h 58mBritish Airways
Tue 17/214:05EDI - ONT
2 stops40h 14mBritish Airways
Deal found 2/1£454
Thu 22/116:45ONT - MAN
2 stops15h 45mBritish Airways
Mon 26/111:50MAN - ONT
2 stops18h 58mBritish Airways
Deal found 2/1£458
Tue 17/213:15ONT - LHR
1 stop14h 25mKLM
Tue 24/206:30LHR - ONT
2 stops22h 35mKLM
Deal found 3/1£462
Mon 16/205:00ONT - LHR
2 stops18h 10mMultiple Airlines
Mon 23/207:40LHR - ONT
2 stops22h 20mMultiple Airlines
Deal found 1/1£464
Fri 27/217:02ONT - GLA
2 stops16h 58mBritish Airways
Sun 8/311:40GLA - ONT
2 stops17h 27mBritish Airways
Deal found 2/1£464
Sun 12/412:19ONT - EDI
2 stops22h 26mBritish Airways
Wed 22/421:15EDI - ONT
2 stops32h 44mBritish Airways
Deal found 2/1£466
Tue 10/207:16ONT - LHR
1 stop20h 24mIberia
Tue 24/206:00LHR - ONT
2 stops24h 49mIberia
Deal found 3/1£467
Mon 16/213:50ONT - LHR
1 stop14h 10mUnited Airlines
Mon 23/207:40LHR - ONT
2 stops18h 01mUnited Airlines
Deal found 2/1£468
Thu 5/307:30ONT - LHR
1 stop19h 00mKLM
Thu 12/306:30LHR - ONT
2 stops17h 42mKLM
Deal found 2/1£469
Mon 2/307:30ONT - LHR
1 stop19h 00mKLM
Wed 11/306:30LHR - ONT
2 stops17h 42mKLM
Deal found 3/1£469
Sun 22/317:02ONT - MAN
2 stops18h 03mBritish Airways
Tue 21/417:50MAN - ONT
2 stops32h 47mBritish Airways
Deal found 2/1£470

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

Fly to

Heathrow

Route

Depart

Return

Price

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Tue 24/2

14:39-16:55

2 stops18h 16m

Glasgow Intl

Mon 2/3

11:35-22:07

2 stops18h 32m

£452

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 24/2

14:39-15:15

2 stops16h 36m

Edinburgh Turnhouse

Mon 2/3

11:00-22:07

2 stops19h 07m

£454

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Sat 14/2

17:02-19:35

2 stops18h 33m

Edinburgh Turnhouse

Sat 21/2

13:05-22:07

2 stops41h 02m

£454

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Wed 25/2

17:02-17:05

2 stops16h 03m

Edinburgh Turnhouse

Fri 6/3

10:55-22:07

2 stops19h 12m

£454

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Fri 13/2

17:02-17:00

2 stops15h 58m

Edinburgh Turnhouse

Tue 17/2

14:05-22:19

2 stops40h 14m

£454

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Fri 27/2

17:02-17:00

2 stops15h 58m

Edinburgh Turnhouse

Tue 3/3

10:55-22:49

2 stops19h 54m

£454

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Fri 13/2

17:02-17:00

2 stops15h 58m

Edinburgh Turnhouse

Fri 20/2

07:25-22:07

2 stops22h 42m

£454

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Sun 1/2

16:45-17:00

2 stops16h 15m

Edinburgh Turnhouse

Sun 8/2

11:05-22:13

2 stops19h 08m

£454

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Thu 5/3

07:30-10:30

1 stop19h 00m

London Heathrow

Thu 12/3

06:30-17:12

2 stops17h 42m

£469

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 17/2

07:30-10:30

2 stops19h 00m

London Heathrow

Tue 24/2

06:30-21:05

2 stops22h 35m

£472

Flights are sorted by cheapest return flights first.

Deals found on 3/1

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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 2 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 £348). Flying from Ontario in June will prove the most costly (average of £518). 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 (72 flights per day), Seattle (56 flights per day) and Atlanta (43 flights per day).

Portland
Portland
From £64
San Francisco
San Francisco
From £633
New York
New York
From £332

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 £332
San Francisco
San Francisco
From £633

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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 January 2026.

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

    This month, the top selected destinations from Ontario are Guadalajara, Honolulu, Denver. 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 £350 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 £469 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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