£68+ 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 24/2. 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
24 Feb — 3 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 25 January 2026.

Cheapest one-way flight

£24

Cheapest round-trip flight

£37

Cheapest airline

Alaska Airlines

Most popular destination

London Heathrow (LHR)

Good round-trip deal

£63 or less

Good one-way deal

£328 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 £84).
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London Heathrow (LHR) is currently the most popular flight destination from Ontario (average return price of £391).
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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 25 January 2026.

Sun 22/217:02
ONT
-
GLA
2 stops18h 23m
British Airways
Sun 1/314:30
GLA
-
ONT
2 stops39h 37m
British Airways
Deal found 23/1£445
Fri 27/214:39
ONT
-
MAN
2 stops17h 56m
British Airways
Tue 3/309:40
MAN
-
ONT
2 stops21h 09m
British Airways
Deal found 24/1£451
Mon 23/217:02
ONT
-
MAN
2 stops15h 28m
British Airways
Mon 2/309:40
MAN
-
ONT
2 stops21h 09m
British Airways
Deal found 24/1£453
Mon 9/312:57
ONT
-
LHR
1 stop15h 43m
KLM
Mon 16/320:25
LHR
-
ONT
2 stops27h 03m
KLM
Deal found 23/1£457
Wed 25/310:56
ONT
-
LHR
1 stop12h 54m
Iberia
Wed 1/416:25
LHR
-
ONT
1 stop15h 34m
Iberia
Deal found 22/1£458
Tue 10/310:56
ONT
-
EDI
2 stops19h 24m
American Airlines
Tue 17/306:05
EDI
-
ONT
2 stops19h 37m
American Airlines
Deal found 24/1£459
Thu 5/307:30
ONT
-
LHR
1 stop19h 00m
KLM
Thu 12/306:30
LHR
-
ONT
2 stops17h 42m
KLM
Deal found 23/1£462
Tue 21/410:59
ONT
-
LHR
1 stop13h 06m
British Airways
Tue 28/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Deal found 22/1£464
Mon 9/306:00
ONT
-
LGW
2 stops23h 25m
British Airways
Mon 16/319:30
LGW
-
ONT
2 stops30h 12m
British Airways
Deal found 22/1£464
Thu 19/217:02
ONT
-
MAN
2 stops18h 03m
British Airways
Sun 22/214:50
MAN
-
ONT
2 stops39h 17m
British Airways
Deal found 23/1£464
Tue 3/315:30
ONT
-
LHR
2 stops20h 40m
Delta
Tue 10/306:30
LHR
-
ONT
2 stops17h 42m
Delta
Deal found 23/1£466
Tue 24/315:19
ONT
-
LHR
1 stop13h 56m
British Airways
Wed 1/410:05
LHR
-
ONT
1 stop14h 17m
British Airways
Deal found 22/1£467

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 25 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

Sun 22/2

17:02-19:25

2 stops18h 23m

Glasgow Intl

Sun 1/3

14:30-22:07

2 stops39h 37m

£445

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Mon 23/2

17:02-16:30

2 stops15h 28m

Manchester

Mon 2/3

09:40-22:49

2 stops21h 09m

£453

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Fri 20/2

06:00-10:00

1 stop20h 00m

London Heathrow

Fri 27/2

06:30-22:37

2 stops24h 07m

£462

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

£462

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Thu 19/2

17:02-19:05

2 stops18h 03m

Manchester

Sun 22/2

14:50-22:07

2 stops39h 17m

£464

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 10/3

06:00-11:40

2 stops22h 40m

London Heathrow

Tue 17/3

06:30-22:34

2 stops23h 04m

£466

OntarioNewcastle upon Tyne

ONT - NCL

ONTNCL

Ontario

Mon 9/3

11:59-13:10

2 stops18h 11m

Newcastle upon Tyne

Mon 16/3

06:00-21:00

2 stops22h 00m

£468

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Tue 10/3

23:59-10:20

2 stops27h 21m

Manchester

Tue 17/3

06:10-22:18

2 stops23h 08m

£470

OntarioEdinburgh

ONT - EDI

ONTEDI

Ontario

Tue 21/4

06:05-08:05

2 stops18h 00m

Edinburgh Turnhouse

Wed 29/4

09:40-21:50

2 stops20h 10m

£470

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Sun 19/4

12:19-21:30

2 stops25h 11m

Manchester

Wed 6/5

09:20-23:46

2 stops22h 26m

£471

Flights are sorted by cheapest return flights first.

Deals found on 23/1

Showing 1-10 of 60 results
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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 23 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 £344). Flying from Ontario in June will prove the most costly (average of £512). 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 (97 flights per day), Seattle (82 flights per day) and Phoenix (64 flights per day).

Portland
Portland
From £63
New York
New York
From £328

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 £328

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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 25 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 £196 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 £442 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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