£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 29/1. 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
29 Jan — 5 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 30 December 2025.

Cheapest one-way flight

£20

Cheapest round-trip flight

£79

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£64 or less

Good one-way deal

£331 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 San Francisco.
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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 £372).
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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 30 December 2025.

Sat 4/422:25ONT - KEF
2 stops28h 05mDelta
Tue 21/411:25KEF - ONT
2 stops16h 33mDelta
Deal found 29/12£365
Fri 10/422:25ONT - KEF
2 stops52h 05mDelta
Wed 22/411:25KEF - ONT
2 stops16h 33mDelta
Deal found 29/12£373
Mon 26/115:09ONT - GLA
2 stops17h 26mBritish Airways
Mon 2/211:35GLA - ONT
2 stops19h 13mBritish Airways
Deal found 29/12£450
Sun 25/116:45ONT - EDI
2 stops16h 15mBritish Airways
Sun 1/207:25EDI - ONT
2 stops22h 48mBritish Airways
Deal found 28/12£453
Wed 11/215:09ONT - MAN
2 stops17h 11mBritish Airways
Wed 18/207:50MAN - ONT
2 stops22h 59mBritish Airways
Deal found 28/12£457
Mon 16/323:59ONT - EDI
2 stops26h 31mUnited Airlines
Wed 25/311:30EDI - ONT
2 stops17h 55mUnited Airlines
Deal found 28/12£462
Tue 3/314:39ONT - MAN
2 stops17h 51mBritish Airways
Tue 31/312:25MAN - ONT
2 stops17h 42mBritish Airways
Deal found 29/12£462
Sat 31/112:41ONT - MAN
1 stop13h 49mDelta
Wed 11/213:00MAN - ONT
1 stop16h 05mDelta
Deal found 28/12£462
Wed 1/417:02ONT - EDI
2 stops17h 13mBritish Airways
Wed 8/421:15EDI - ONT
2 stops32h 44mBritish Airways
Deal found 28/12£465
Tue 24/213:15ONT - MAN
1 stop13h 15mDelta
Tue 10/310:25MAN - ONT
2 stops20h 25mDelta
Deal found 28/12£465
Wed 11/207:16ONT - LHR
1 stop20h 24mIberia
Tue 17/206:00LHR - ONT
2 stops24h 49mIberia
Deal found 29/12£465
Sun 15/322:25ONT - EDI
2 stops51h 20mDelta
Mon 23/310:45EDI - ONT
2 stops31h 55mDelta
Deal found 28/12£466

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 30 December 2025. 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

Sat 4/4

22:25-09:30

2 stops28h 05m

Reykjavik Keflavik Intl

Wed 22/4

11:25-20:58

2 stops16h 33m

£365

OntarioReykjavik

ONT - KEF

ONTKEF

Ontario

Tue 14/4

07:00-09:30

2 stops19h 30m

Reykjavik Keflavik Intl

Tue 28/4

11:25-20:58

2 stops16h 33m

£365

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Mon 26/1

15:09-16:35

2 stops17h 26m

Glasgow Intl

Mon 2/2

11:35-22:48

2 stops19h 13m

£450

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Fri 13/2

14:39-17:00

2 stops18h 21m

Edinburgh Turnhouse

Sun 22/2

07:25-22:07

2 stops22h 42m

£453

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 16/3

23:58-07:30

2 stops24h 32m

Edinburgh Turnhouse

Tue 24/3

11:25-22:49

2 stops18h 24m

£462

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 16/3

18:37-06:55

3 stops29h 18m

Edinburgh Turnhouse

Mon 23/3

11:30-12:18

2 stops31h 48m

£462

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Wed 18/3

23:59-09:30

2 stops26h 31m

Edinburgh Turnhouse

Mon 23/3

11:30-22:25

2 stops17h 55m

£462

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 16/3

22:25-08:45

2 stops27h 20m

Edinburgh Turnhouse

Mon 23/3

10:45-11:40

2 stops31h 55m

£462

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Mon 16/3

23:59-09:30

2 stops26h 31m

Edinburgh Turnhouse

Wed 25/3

11:30-22:25

2 stops17h 55m

£462

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 3/3

14:39-16:30

2 stops17h 51m

Manchester

Tue 31/3

12:25-22:07

2 stops17h 42m

£462

Flights are sorted by cheapest return flights first.

Deals found on 29/12

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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 26 December 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, December is the cheapest month in which you can book a flight from Ontario (average of £347). Flying from Ontario in June will prove the most costly (average of £517). 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 (118 flights per day), Seattle (112 flights per day) and Atlanta (100 flights per day).

Portland
Portland
From £64
San Francisco
San Francisco
From £631
New York
New York
From £331

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 £331
San Francisco
San Francisco
From £631

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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 30 December 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 £64 to Portland (prices may vary depending on the airline and departure time). On average, users have booked flights for £349 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 £467 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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