£55+ 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 23/1. 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
20 Dec — 27 Dec1
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 20 November 2025.

Cheapest one-way flight

£37

Cheapest round-trip flight

£93

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£66 or less

Good one-way deal

£33 or less
The cheapest one-way flight from Ontario is currently to San Francisco.
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The cheapest round-trip flight from Ontario is currently to San Francisco.
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On average, Alaska Airlines currently has the cheapest one-way flight from Ontario (avg. price of £90).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £374).
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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 20 November 2025.

Thu 12/216:59ONT - GLA
2 stops16h 51mBritish Airways
Thu 19/209:55GLA - ONT
2 stops20h 13mBritish Airways
Deal found 20/11£464
Thu 22/116:45ONT - MAN
2 stops15h 45mBritish Airways
Thu 5/209:45MAN - ONT
2 stops20h 28mBritish Airways
Deal found 18/11£469
Fri 9/105:05ONT - LHR
2 stops22h 15mAir Canada
Sun 18/114:30LHR - ONT
2 stops40h 23mAir Canada
Deal found 20/11£470
Wed 28/107:30ONT - LHR
1 stop19h 00mVirgin Atlantic
Sun 1/208:40LHR - ONT
2 stops46h 11mVirgin Atlantic
Deal found 17/11£471
Wed 31/1212:45ONT - MAN
2 stops17h 10mAmerican Airlines
Thu 15/105:40MAN - ONT
2 stops21h 05mAmerican Airlines
Deal found 19/11£471
Fri 6/206:10ONT - EDI
2 stops17h 45mUnited Airlines
Tue 10/209:25EDI - ONT
2 stops19h 33mUnited Airlines
Deal found 17/11£471
Wed 28/106:00ONT - LHR
2 stops16h 20mDelta
Sun 1/206:30LHR - ONT
2 stops24h 21mDelta
Deal found 17/11£474
Tue 6/115:30ONT - LHR
1 stop13h 20mDelta
Tue 10/208:40LHR - ONT
2 stops20h 25mDelta
Deal found 20/11£478
Sat 17/116:45ONT - GLA
2 stops19h 40mBritish Airways
Fri 30/111:40GLA - ONT
2 stops19h 08mBritish Airways
Deal found 17/11£478
Wed 31/1206:00ONT - MAN
2 stops22h 45mDelta
Thu 15/113:30MAN - ONT
1 stop30h 01mDelta
Deal found 18/11£478
Tue 13/106:00ONT - EDI
2 stops20h 40mDelta
Wed 21/105:50EDI - ONT
2 stops18h 25mDelta
Deal found 19/11£478
Mon 5/118:39ONT - LHR
2 stops55h 01mUnited Airlines
Tue 20/108:30LHR - ONT
2 stops21h 28mUnited Airlines
Deal found 17/11£478

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 20 November 2025. 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

Fri 6/2

06:10-07:55

2 stops17h 45m

Edinburgh Turnhouse

Tue 10/2

09:25-20:58

2 stops19h 33m

£471

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Sat 17/1

16:45-20:25

2 stops19h 40m

Glasgow Intl

Fri 30/1

11:40-22:48

2 stops19h 08m

£478

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 5/1

18:39-09:40

2 stops55h 01m

London Heathrow

Tue 20/1

08:30-21:58

2 stops21h 28m

£478

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 13/1

06:00-10:40

2 stops20h 40m

Edinburgh Turnhouse

Wed 21/1

05:50-16:15

2 stops18h 25m

£478

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 13/1

06:00-10:40

2 stops20h 40m

Edinburgh Turnhouse

Fri 23/1

05:50-16:15

2 stops18h 25m

£478

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 13/1

06:00-10:40

2 stops20h 40m

Edinburgh Turnhouse

Thu 22/1

05:50-16:15

2 stops18h 25m

£478

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Wed 31/12

06:00-12:45

2 stops22h 45m

Manchester

Thu 15/1

13:30-11:31

1 stop30h 01m

£478

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 10/2

07:30-10:40

2 stops19h 10m

Edinburgh Turnhouse

Sat 21/2

05:45-21:48

2 stops24h 03m

£479

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 10/2

07:30-10:40

2 stops19h 10m

Edinburgh Turnhouse

Wed 18/2

05:50-21:07

2 stops23h 17m

£479

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Fri 13/2

13:09-10:30

1 stop13h 21m

Manchester

Tue 17/2

11:00-23:53

2 stops44h 53m

£480

Flights are sorted by cheapest return flights first.

Deals found on 18/11

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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 14 November 2025.

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, January is the cheapest month in which you can book a flight from Ontario (average of £362). Flying from Ontario in June will prove the most costly (average of £533). 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 Atlanta (88 flights per day), Dallas (84 flights per day) and Seattle (81 flights per day).

Portland
Portland
From £66
Dallas/Fort Worth
Dallas/Fort Worth
From £222
Phoenix Sky Harbor Intl
Phoenix Sky Harbor Intl
From £192
San Francisco
San Francisco
From £650

What is the cheapest place to fly to from Ontario?

The cheapest city to fly to from Ontario is Denver Intl, with prices starting at £33. Explore other affordable destinations below.

Denver Intl
Denver Intl
From £33
Portland
Portland
From £66
Phoenix Sky Harbor Intl
Phoenix Sky Harbor Intl
From £192
Dallas/Fort Worth
Dallas/Fort Worth
From £222

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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 20 November 2025.

  • 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 £33 to Denver (prices may vary depending on the airline and departure time). On average, users have booked flights for £336 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 January; 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 £473 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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