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Cheap flights from Ontario to Belfast from $365

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 11/5. 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 round-trip flights

Enter your travel dates to find the best prices.
British Airways Logo
10:25 am - 12:55 pmONT  Ontario-BHD Belfast City
18h 30m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
12:40 pm - 11:52 pmBHD  Belfast City-ONT Ontario
19h 12m2 stops London Heathrow Dallas/Fort Worth
$1,095British Airways
Mon, Oct 5 - Tue, Oct 13
British Airways Logo
3:09 pm - 4:50 pmONT  Ontario-BHD Belfast City
17h 41m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
7:40 am - 10:49 pmBHD  Belfast City-ONT Ontario
23h 09m2 stops London Heathrow Dallas/Fort Worth
$1,129British Airways
Sun, Jan 10 - Thu, Jan 14
British Airways Logo
12:57 pm - 4:50 pmONT  Ontario-BHD Belfast City
19h 53m2 stops Phoenix Sky Harbor Intl London Heathrow
British Airways Logo
6:35 am - 6:45 pmBHD  Belfast City-ONT Ontario
20h 10m2 stops London Heathrow Dallas/Fort Worth
$1,129British Airways
Sun, Jan 24 - Thu, Jan 28
British Airways Logo
7:16 am - 4:50 pmONT  Ontario-BHD Belfast City
25h 34m2 stops Dallas/Fort Worth London Heathrow
British Airways Logo
7:40 am - 10:49 pmBHD  Belfast City-ONT Ontario
23h 09m2 stops London Heathrow Dallas/Fort Worth
$1,130British Airways
Sun, Jan 10 - Thu, Jan 14
British Airways Logo
12:57 pm - 4:50 pmONT  Ontario-BHD Belfast City
19h 53m2 stops Phoenix Sky Harbor Intl London Heathrow
British Airways Logo
6:35 am - 6:45 pmBHD  Belfast City-ONT Ontario
20h 10m2 stops London Heathrow Dallas/Fort Worth
$1,130British Airways
Sun, Jan 24 - Thu, Jan 28
British Airways Logo
12:55 pm - 4:05 pmONT  Ontario-BHD Belfast City
19h 10m2 stops Phoenix Sky Harbor Intl London Heathrow
British Airways Logo
7:25 pm - 10:01 pmBHD  Belfast City-ONT Ontario
34h 36m2 stops London Heathrow Phoenix Sky Harbor Intl
$1,154British Airways
Mon, Dec 28 - Tue, Jan 5
British Airways Logo
12:55 pm - 4:05 pmONT  Ontario-BHD Belfast City
19h 10m2 stops Phoenix Sky Harbor Intl London Heathrow
British Airways Logo
7:25 pm - 10:01 pmBHD  Belfast City-ONT Ontario
34h 36m2 stops London Heathrow Phoenix Sky Harbor Intl
$1,155British Airways
Mon, Dec 28 - Tue, Jan 5
Multiple Airlines Logo
12:45 pm - 5:25 pmONT  Ontario-BHD Belfast City
20h 40m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
7:00 am - 9:52 pmBHD  Belfast City-ONT Ontario
22h 52m3 stops Edinburgh Turnhouse Philadelphia Phoenix Sky Harbor Intl
$1,357Multiple Airlines
Mon, Dec 28 - Tue, Jan 5
Multiple Airlines Logo
2:42 pm - 5:25 pmONT  Ontario-BHD Belfast City
18h 43m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
9:50 am - 10:39 pmBHD  Belfast City-ONT Ontario
20h 49m3 stops Glasgow Intl London Heathrow Seattle/Tacoma Intl
$1,423Multiple Airlines
Mon, Dec 28 - Tue, Jan 5
Multiple Airlines Logo
2:42 pm - 4:05 pmONT  Ontario-BHD Belfast City
17h 23m2 stops Dallas/Fort Worth London Heathrow
Multiple Airlines Logo
9:50 am - 10:39 pmBHD  Belfast City-ONT Ontario
20h 49m3 stops Glasgow Intl London Heathrow Seattle/Tacoma Intl
$1,427Multiple Airlines
Mon, Dec 28 - Tue, Jan 5

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British Airways flights from Ontario to Belfast

Our best British Airways deals on Ontario to Belfast flight tickets
British Airways
Oct 5
ONT10:25 amOntario
18h 30m
2 stops
BHD12:55 pmBelfast City
Oct 13
BHD12:40 pmBelfast City
19h 12m
2 stops
ONT11:52 pmOntario
$1,095
British Airways
Jan 10
ONT3:09 pmOntario
17h 41m
2 stops
BHD4:50 pmBelfast City
Jan 14
BHD7:40 amBelfast City
23h 09m
2 stops
ONT10:49 pmOntario
$1,129
British Airways
Jan 10
ONT7:16 amOntario
25h 34m
2 stops
BHD4:50 pmBelfast City
Jan 14
BHD7:40 amBelfast City
23h 09m
2 stops
ONT10:49 pmOntario
$1,130

KLM flights from Ontario to Belfast

Our best KLM deals on Ontario to Belfast flight tickets
KLM
Aug 23
ONT5:05 pmOntario
15h 50m
2 stops
BHD4:55 pmBelfast City
Aug 27
BHD9:50 amBelfast City
20h 02m
2 stops
ONT9:52 pmOntario
$1,818
KLM
Aug 18
ONT7:05 amOntario
18h 15m
2 stops
BHD9:20 amBelfast City
Sep 3
BHD9:50 amBelfast City
20h 02m
2 stops
ONT9:52 pmOntario
$3,368
KLM
Aug 18
ONT7:05 amOntario
18h 15m
2 stops
BHD9:20 amBelfast City
Sep 2
BHD9:50 amBelfast City
20h 33m
2 stops
ONT10:23 pmOntario
$3,369

momondo Fare Finder

 
Customize 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 832,500 searches. Data last updated August 8, 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 round-trip
Quickest round-trip

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 10/5

10:25 am-12:55 pm

2 stops18h 30m

Belfast City

Tue 10/13

12:40 pm-11:52 pm

2 stops19h 12m

$1,095

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 1/10

3:09 pm-4:50 pm

2 stops17h 41m

Belfast City

Thu 1/14

7:40 am-10:49 pm

2 stops23h 09m

$1,129

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 1/24

12:57 pm-4:50 pm

2 stops19h 53m

Belfast City

Thu 1/28

6:35 am-6:45 pm

2 stops20h 10m

$1,129

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 1/10

7:16 am-4:50 pm

2 stops25h 34m

Belfast City

Thu 1/14

7:40 am-10:49 pm

2 stops23h 09m

$1,130

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Sun 1/24

12:57 pm-4:50 pm

2 stops19h 53m

Belfast City

Thu 1/28

6:35 am-6:45 pm

2 stops20h 10m

$1,130

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 12/28

12:55 pm-4:05 pm

2 stops19h 10m

Belfast City

Tue 1/5

7:25 pm-10:01 pm

2 stops34h 36m

$1,154

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 12/28

12:55 pm-4:05 pm

2 stops19h 10m

Belfast City

Tue 1/5

7:25 pm-10:01 pm

2 stops34h 36m

$1,155

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 12/28

12:45 pm-5:25 pm

2 stops20h 40m

Belfast City

Tue 1/5

7:00 am-9:52 pm

3 stops22h 52m

$1,357

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 12/28

2:42 pm-5:25 pm

2 stops18h 43m

Belfast City

Tue 1/5

9:50 am-10:39 pm

3 stops20h 49m

$1,423

OntarioBelfast

ONT Ontario - BHD Belfast City

ONTBHD

Ontario

Mon 12/28

2:42 pm-4:05 pm

2 stops17h 23m

Belfast City

Tue 1/5

9:50 am-10:39 pm

3 stops20h 49m

$1,427

Flights are sorted by cheapest round-trip 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.
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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. By plane, this route typically takes 15h 50m.

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

    Prices for flights from Ontario Airport to Belfast are refreshed on a daily basis.

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

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to Belfast.

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

    The required travel and health documents for your Belfast trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Belfast. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

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

Finding the right flight to Belfast from Ontario is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Belfast quick and easy, saving you time and money.

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?

Once all potential Ontario to Belfast flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Yes momondo offers price alerts on flights to Belfast from Ontario. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices 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