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Cheap flights from Ontario to Belfast from £271

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to Belfast departing on 5/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Ontario to Belfast

Cheap return flights

Enter your travel dates to find the best prices.
British Airways Logo
10:25 - 12:55ONT  Ontario-BHD Belfast City
18h 30m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
12:40 - 23:52BHD  Belfast City-ONT Ontario
19h 12m2 stops London Heathrow Dallas/Fort Worth
£813British Airways
Mon, 5 Oct - Tue, 13 Oct
British Airways Logo
15:09 - 16:50ONT  Ontario-BHD Belfast City
17h 41m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
07:40 - 22:49BHD  Belfast City-ONT Ontario
23h 09m2 stops London Heathrow Dallas/Fort Worth
£838British Airways
Sun, 10 Jan - Thu, 14 Jan
British Airways Logo
07:16 - 16:50ONT  Ontario-BHD Belfast City
25h 34m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
07:40 - 22:49BHD  Belfast City-ONT Ontario
23h 09m2 stops London Heathrow Dallas/Fort Worth
£839British Airways
Sun, 10 Jan - Thu, 14 Jan
British Airways Logo
12:55 - 16:05ONT  Ontario-BHD Belfast City
19h 10m2 stops Phoenix Sky Harbor Intl London Heathrow
British Airways Logo
19:25 - 22:01BHD  Belfast City-ONT Ontario
34h 36m2 stops London Heathrow Phoenix Sky Harbor Intl
£857British Airways
Mon, 28 Dec - Tue, 5 Jan
British Airways Logo
12:55 - 16:05ONT  Ontario-BHD Belfast City
19h 10m2 stops Phoenix Sky Harbor Intl London Heathrow
British Airways Logo
19:25 - 22:01BHD  Belfast City-ONT Ontario
34h 36m2 stops London Heathrow Phoenix Sky Harbor Intl
£857British Airways
Mon, 28 Dec - Tue, 5 Jan
Multiple Airlines Logo
12:45 - 17:25ONT  Ontario-BHD Belfast City
20h 40m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
07:00 - 21:52BHD  Belfast City-ONT Ontario
22h 52m3 stops Edinburgh Turnhouse Philadelphia Phoenix Sky Harbor Intl
£1,007Multiple Airlines
Mon, 28 Dec - Tue, 5 Jan
Multiple Airlines Logo
14:42 - 17:25ONT  Ontario-BHD Belfast City
18h 43m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
09:50 - 22:39BHD  Belfast City-ONT Ontario
20h 49m3 stops Glasgow Intl London Heathrow Seattle/Tacoma Intl
£1,056Multiple Airlines
Mon, 28 Dec - Tue, 5 Jan
Multiple Airlines Logo
14:42 - 17:25ONT  Ontario-BHD Belfast City
18h 43m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
09:50 - 22:39BHD  Belfast City-ONT Ontario
20h 49m3 stops Glasgow Intl London Heathrow Seattle/Tacoma Intl
£1,059Multiple Airlines
Mon, 28 Dec - Tue, 5 Jan
Multiple Airlines Logo
14:42 - 16:05ONT  Ontario-BHD Belfast City
17h 23m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
09:50 - 22:39BHD  Belfast City-ONT Ontario
20h 49m3 stops Glasgow Intl London Heathrow Seattle/Tacoma Intl
£1,060Multiple Airlines
Mon, 28 Dec - Tue, 5 Jan
British Airways Logo
12:33 - 14:35ONT  Ontario-BHD Belfast City
18h 02m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
13:10 - 22:43BHD  Belfast City-ONT Ontario
17h 33m2 stops London Heathrow Phoenix Sky Harbor Intl
£1,308British Airways
Sun, 6 Sep - Sun, 13 Sep

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British Airways flights from Ontario to Belfast

Our best British Airways deals on Ontario to Belfast flight tickets
British Airways
5 Oct
ONT10:25Ontario
18h 30m
2 stops
BHD12:55Belfast City
13 Oct
BHD12:40Belfast City
19h 12m
2 stops
ONT23:52Ontario
£813
British Airways
10 Jan
ONT15:09Ontario
17h 41m
2 stops
BHD16:50Belfast City
14 Jan
BHD07:40Belfast City
23h 09m
2 stops
ONT22:49Ontario
£838
British Airways
10 Jan
ONT07:16Ontario
25h 34m
2 stops
BHD16:50Belfast City
14 Jan
BHD07:40Belfast City
23h 09m
2 stops
ONT22:49Ontario
£839

KLM flights from Ontario to Belfast

Our best KLM deals on Ontario to Belfast flight tickets
KLM
23 Aug
ONT17:05Ontario
15h 50m
2 stops
BHD16:55Belfast City
27 Aug
BHD09:50Belfast City
20h 02m
2 stops
ONT21:52Ontario
£1,349
KLM
18 Aug
ONT07:05Ontario
18h 15m
2 stops
BHD09:20Belfast City
3 Sept
BHD09:50Belfast City
20h 02m
2 stops
ONT21:52Ontario
£2,500
KLM
18 Aug
ONT07:05Ontario
18h 15m
2 stops
BHD09:20Belfast City
2 Sept
BHD09:50Belfast City
20h 33m
2 stops
ONT22:23Ontario
£2,501

momondo Fare Finder

 
Customise your flight search to find flights from Ontario to Belfast that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 279,928 searches. Data last updated 8 August 2026.
Use the filters below to find and compare flights from Ontario to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 5/10

10:25-12:55

2 stops18h 30m

Belfast City

Tue 13/10

12:40-23:52

2 stops19h 12m

£813

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 10/1

15:09-16:50

2 stops17h 41m

Belfast City

Thu 14/1

07:40-22:49

2 stops23h 09m

£838

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 10/1

07:16-16:50

2 stops25h 34m

Belfast City

Thu 14/1

07:40-22:49

2 stops23h 09m

£839

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 28/12

12:55-16:05

2 stops19h 10m

Belfast City

Tue 5/1

19:25-22:01

2 stops34h 36m

£857

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 28/12

12:55-16:05

2 stops19h 10m

Belfast City

Tue 5/1

19:25-22:01

2 stops34h 36m

£857

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 28/12

12:45-17:25

2 stops20h 40m

Belfast City

Tue 5/1

07:00-21:52

3 stops22h 52m

£1,007

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 28/12

14:42-17:25

2 stops18h 43m

Belfast City

Tue 5/1

09:50-22:39

3 stops20h 49m

£1,056

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 28/12

14:42-17:25

2 stops18h 43m

Belfast City

Tue 5/1

09:50-22:39

3 stops20h 49m

£1,059

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 28/12

14:42-16:05

2 stops17h 23m

Belfast City

Tue 5/1

09:50-22:39

3 stops20h 49m

£1,060
Fastest return journey

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 6/9

12:33-14:35

2 stops18h 02m

Belfast City

Sun 13/9

13:10-22:43

2 stops17h 33m

£1,308

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Belfast from

How to get the cheapest flight ticket from Ontario to Belfast

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Ontario to Belfast?

British Airways is the most popular carrier operating from Ontario to Belfast

Cheap Ontario to Belfast flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ontario to Belfast

Fastest flight time

15h 50m

Direct flights

None
The fastest flight from Ontario to Belfast takes 15h 50m
There are no direct flights from Ontario to Belfast. There are no popular flight routes from Ontario to Belfast.
Search flight deals

Frequently asked questions about flying from Ontario to Belfast

  • How far is Ontario to Belfast by plane?

    The straight-line distance from Ontario to Belfast is 5095.8 mi. Flights usually cover this in 15h 50m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Ontario Airport to Belfast?

    Prices for flights from Ontario Airport to Belfast refresh daily.

  • How old do you have to be to fly from Ontario Airport to Belfast?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ontario Airport to Belfast.

  • What documentation or ID do you need to fly to Belfast?

    The necessary travel and health documents for your Belfast trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Why use momondo?

Why should I use momondo to find a flight deal from Ontario to Belfast?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Belfast from Ontario.

Can I find flights from Ontario to Belfast with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Belfast from Ontario with this policy.

How can momondo help me find flights from Ontario to Belfast?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ontario to Belfast.

I’m not ready to book a flight from Ontario to Belfast right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Belfast, momondo offers a useful price alert feature which will track prices for flights to Belfast from Ontario and alert you when they change.

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Find better results for your trip to the United Kingdom

Fly into one of these airports located in Belfast

Airports listed have a maximum distance of 12.2 mi from Belfast
Belfast Intl Airport
Belfast City Airport