£96+ 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 7/4. 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
15 Apr — 22 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 16 March 2026.

Cheapest one-way flight

£18

Cheapest round-trip flight

£54

Cheapest airline

Delta

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£65 or less

Good one-way deal

£337 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, Delta currently has the cheapest one-way flight from Ontario (avg. price of £87).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £376).
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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 16 March 2026.

Tue 5/506:00
ONT
-
KEF
1 stop20h 25m
Multiple Airlines
Mon 18/516:50
KEF
-
ONT
1 stop24h 25m
Multiple Airlines
Deal found 13/3£528
Mon 13/714:09
ONT
-
KEF
1 stop11h 51m
Alaska Airlines
Fri 17/712:45
KEF
-
ONT
1 stop17h 26m
Alaska Airlines
Deal found 12/3£538
Sat 11/721:13
ONT
-
KEF
1 stop28h 47m
Alaska Airlines
Thu 16/712:45
KEF
-
ONT
1 stop17h 26m
Alaska Airlines
Deal found 15/3£543
Mon 27/406:00
ONT
-
KEF
2 stops20h 30m
Delta
Mon 4/511:25
KEF
-
ONT
2 stops19h 19m
Delta
Deal found 12/3£548
Tue 18/806:00
ONT
-
KEF
1 stop20h 00m
Alaska Airlines
Tue 25/812:45
KEF
-
ONT
1 stop12h 28m
Alaska Airlines
Deal found 12/3£559
Sat 4/714:09
ONT
-
KEF
1 stop11h 51m
Alaska Airlines
Tue 21/712:45
KEF
-
ONT
1 stop17h 26m
Alaska Airlines
Deal found 14/3£576
Mon 24/812:00
ONT
-
KEF
1 stop14h 00m
Alaska Airlines
Tue 1/912:45
KEF
-
ONT
1 stop16h 54m
Alaska Airlines
Deal found 12/3£579
Fri 17/721:13
ONT
-
KEF
1 stop28h 47m
Alaska Airlines
Tue 28/712:45
KEF
-
ONT
1 stop17h 26m
Alaska Airlines
Deal found 14/3£581
Wed 6/510:59
ONT
-
LHR
1 stop15h 56m
Multiple Airlines
Wed 13/512:55
LHR
-
ONT
1 stop17h 41m
Multiple Airlines
Deal found 12/3£583
Sat 25/721:13
ONT
-
KEF
1 stop28h 47m
Alaska Airlines
Sun 2/812:45
KEF
-
ONT
1 stop31h 28m
Alaska Airlines
Deal found 12/3£587
Tue 4/806:30
ONT
-
EDI
1 stop17h 55m
United Airlines
Fri 21/811:30
EDI
-
ONT
1 stop14h 49m
United Airlines
Deal found 14/3£588
Mon 6/414:39
ONT
-
LHR
1 stop13h 31m
Iberia
Wed 22/410:50
LHR
-
ONT
2 stops20h 56m
Iberia
Deal found 15/3£594

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 16 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

OntarioReykjavik

ONT - KEF

ONTKEF

Ontario

Sat 25/7

21:13-09:00

1 stop28h 47m

Reykjavik Keflavik Intl

Sun 2/8

12:45-13:13

1 stop31h 28m

£587

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Mon 17/8

11:55-15:35

1 stop19h 40m

London Heathrow

Fri 4/9

06:30-22:40

2 stops24h 10m

£598
Fastest return journey

OntarioReykjavik

ONT - KEF

ONTKEF

Ontario

Tue 23/6

14:09-09:00

1 stop11h 51m

Reykjavik Keflavik Intl

Wed 8/7

12:45-23:11

1 stop17h 26m

£602

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Wed 15/4

14:20-16:55

2 stops18h 35m

Manchester

Wed 22/4

10:40-21:00

1 stop18h 20m

£606

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

£606

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 21/4

22:15-09:25

2 stops27h 10m

London Gatwick

Tue 5/5

10:35-22:37

2 stops20h 02m

£606

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 21/4

22:15-09:25

2 stops27h 10m

London Gatwick

Wed 6/5

10:25-22:37

2 stops20h 12m

£606

OntarioLondon

ONT - LGW

ONTLGW

Ontario

Tue 21/4

22:15-09:25

2 stops27h 10m

London Gatwick

Fri 8/5

10:25-21:48

2 stops19h 23m

£606

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 21/4

07:00-10:25

2 stops19h 25m

Manchester

Wed 29/4

06:05-17:47

2 stops19h 42m

£611

OntarioReykjavik

ONT - KEF

ONTKEF

Ontario

Tue 5/5

22:15-09:30

2 stops28h 15m

Reykjavik Keflavik Intl

Mon 18/5

08:50-21:48

2 stops19h 58m

£616

Flights are sorted by cheapest return flights first.

Deals found on 11/3

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 £353). Flying from Ontario in June will prove the most costly (average of £526). 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 (111 flights per day), Phoenix (80 flights per day) and Denver (55 flights per day).

Portland
Portland
From £65
New York
New York
From £337

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 £337

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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 16 March 2026.

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

    This month, the top selected destinations from Ontario are Las Vegas, Dallas/Fort Worth Airport, Denver. Throughout the year, Las Vegas, Dallas/Fort Worth Airport, Denver 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 £252 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 £598 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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