Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from Ontario to the United Kingdom from $259

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 the United Kingdom departing on 11/3. 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
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Ontario to the United Kingdom

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
1:40 pm - 12:00 pmONT-LHR
14h 20m1 stop
United Airlines Logo
1:45 pm - 10:51 pmLHR-ONT
17h 06m1 stop
$628United Airlines
Find Deal
Sun, Nov 16 - Tue, Nov 25
Multiple Airlines Logo
7:00 am - 10:20 amONT-MAN
20h 20m2 stops
Multiple Airlines Logo
6:25 am - 5:34 pmMAN-ONT
19h 09m2 stops
$637Multiple Airlines
Find Deal
Mon, Oct 27 - Wed, Nov 5
Delta Logo
7:05 am - 6:30 amONT-MAN
15h 25m1 stop
Delta Logo
9:05 am - 11:04 pmMAN-ONT
21h 59m1 stop
$664Delta
Find Deal
Sun, Nov 16 - Sun, Nov 23
American Airlines Logo
2:53 pm - 5:35 pmONT-GLA
18h 42m2 stops
American Airlines Logo
6:35 am - 8:56 amGLA-ONT
34h 21m2 stops
$665American Airlines
Find Deal
Sun, Nov 16 - Thu, Nov 27
Delta Logo
6:00 am - 10:00 amONT-LHR
20h 00m1 stop
Delta Logo
8:40 am - 9:14 pmLHR-ONT
20h 34m2 stops
$671Delta
Find Deal
Tue, Dec 30 - Wed, Jan 21
British Airways Logo
4:49 pm - 12:50 pmONT-LHR
12h 01m1 stop
British Airways Logo
10:05 am - 6:53 pmLHR-ONT
15h 48m1 stop
$673British Airways
Find Deal
Sun, Oct 19 - Thu, Oct 30
American Airlines Logo
7:16 am - 11:55 amONT-MAN
20h 39m2 stops
American Airlines Logo
9:45 am - 11:43 pmMAN-ONT
21h 58m2 stops
$680American Airlines
Find Deal
Fri, Feb 6 - Thu, Feb 12
Iberia Logo
12:53 pm - 10:00 amONT-LHR
13h 07m1 stop
Iberia Logo
4:30 pm - 11:57 pmLHR-ONT
15h 27m1 stop
$681Iberia
Find Deal
Sun, Nov 9 - Tue, Nov 25
British Airways Logo
4:49 pm - 12:50 pmONT-LHR
12h 01m1 stop
British Airways Logo
10:05 am - 5:45 pmLHR-ONT
15h 40m1 stop
$687British Airways
Find Deal
Wed, Oct 15 - Wed, Apr 15
Iberia Logo
8:43 am - 6:50 amONT-LHR
14h 07m1 stop
Iberia Logo
4:30 pm - 11:43 pmLHR-ONT
15h 13m1 stop
$688Iberia
Find Deal
Wed, Feb 11 - Wed, Feb 25

United Airlines flights from Ontario to United Kingdom

Our best United Airlines deals on Ontario to United Kingdom flight tickets
United Airlines
Nov 16
ONT1:40 pmOntario
14h 20m
1 stop
LHR12:00 pmLondon Heathrow
Nov 25
LHR1:45 pmLondon Heathrow
17h 06m
1 stop
ONT10:51 pmOntario
$628
Find similar
United Airlines
Oct 27
ONT7:00 amOntario
20h 20m
2 stops
MAN10:20 amManchester
Nov 5
MAN6:10 amManchester
24h 41m
3 stops
ONT10:51 pmOntario
$639
Find similar
United Airlines
Oct 28
ONT6:05 amOntario
27h 55m
2 stops
MAN5:00 pmManchester
Nov 5
MAN6:10 amManchester
24h 41m
3 stops
ONT10:51 pmOntario
$650
Find similar

Air Canada flights from Ontario to United Kingdom

Our best Air Canada deals on Ontario to United Kingdom flight tickets
Air Canada
Oct 19
ONT5:05 amOntario
17h 25m
2 stops
LHR6:30 amLondon Heathrow
Oct 28
LHR2:30 pmLondon Heathrow
29h 07m
2 stops
ONT12:37 pmOntario
$656
Find similar
Air Canada
Oct 19
ONT5:05 amOntario
17h 25m
2 stops
LHR6:30 amLondon Heathrow
Oct 28
LHR2:30 pmLondon Heathrow
29h 07m
2 stops
ONT12:37 pmOntario
$657
Find similar
Air Canada
Oct 22
ONT5:05 amOntario
22h 45m
2 stops
LHR11:50 amLondon Heathrow
Oct 29
LHR2:30 pmLondon Heathrow
39h 21m
2 stops
ONT10:51 pmOntario
$663
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ontario to United Kingdom 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 October 2, 2025.
Use the filters below to find and compare flights from Ontario to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/16

1:40 pm-12:00 pm

1 stop14h 20m

London Heathrow

Tue 11/25

1:45 pm-10:51 pm

1 stop17h 06m

$628

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Mon 10/27

7:00 am-10:20 am

2 stops20h 20m

Manchester

Wed 11/5

6:25 am-5:34 pm

2 stops19h 09m

$637

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Sun 11/16

7:05 am-6:30 am

1 stop15h 25m

Manchester

Sun 11/23

9:05 am-11:04 pm

1 stop21h 59m

$664

OntarioGlasgow

ONT - GLA

ONTGLA

Ontario

Sun 11/16

2:53 pm-5:35 pm

2 stops18h 42m

Glasgow Intl

Thu 11/27

6:35 am-8:56 am

2 stops34h 21m

$665

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Tue 12/30

6:00 am-10:00 am

1 stop20h 00m

London Heathrow

Wed 1/21

8:40 am-9:14 pm

2 stops20h 34m

$671

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 10/19

4:49 pm-12:50 pm

1 stop12h 01m

London Heathrow

Thu 10/30

10:05 am-6:53 pm

1 stop15h 48m

$673

OntarioManchester

ONT - MAN

ONTMAN

Ontario

Fri 2/6

7:16 am-11:55 am

2 stops20h 39m

Manchester

Thu 2/12

9:45 am-11:43 pm

2 stops21h 58m

$680

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Sun 11/9

12:53 pm-10:00 am

1 stop13h 07m

London Heathrow

Tue 11/25

4:30 pm-11:57 pm

1 stop15h 27m

$681

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 10/15

4:49 pm-12:50 pm

1 stop12h 01m

London Heathrow

Wed 4/15

10:05 am-5:45 pm

1 stop15h 40m

$687

OntarioLondon

ONT - LHR

ONTLHR

Ontario

Wed 2/11

8:43 am-6:50 am

1 stop14h 07m

London Heathrow

Wed 2/25

4:30 pm-11:43 pm

1 stop15h 13m

$688

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

See travel insights to the United Kingdom from

How to get the cheapest flight ticket from Ontario to United Kingdom

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 month to fly to United Kingdom?

In general, October is the cheapest month to fly from Ontario to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $676. If you aren’t able to travel to United Kingdom during the month of October, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $684.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from Ontario to United Kingdom is on a Wednesday when prices can be found for as low as $668. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $1,112.

What is the cheapest time of day to depart on your flight to United Kingdom?

According to our data, the cheapest time of day to fly to United Kingdom is in the evening. momondo users have found flights departing from Ontario to United Kingdom in the evening for as low as $662. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly in the morning, with an average ticket price of $871. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to United Kingdom?

You are more likely to see cheaper flights to United Kingdom from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around $845 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Ontario for as low as $606 on momondo.

Can stopping save me money on Ontario to United Kingdom flights?

You could potentially save up to 13% on your flight if you consider stops on a Ontario to United Kingdom flight.

Cheap Ontario to United Kingdom flight deals and tips

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

Direct flights

None
There are no direct flights from Ontario to United Kingdom. There are no popular flight routes from Ontario to United Kingdom.
Search flight deals

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

    Prices for flights from Ontario Airport to United Kingdom were last updated today.

  • How many operators does momondo search for flights from Ontario Airport to United Kingdom?

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Ontario Airport to United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The travel and health documents required for your trip to United Kingdom can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at United Kingdom. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from Ontario to United Kingdom

Compare and see reviews for airlines that fly from Ontario to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
Virgin AtlanticPriceFrom $469Free CancellationRating
7.4
665 reviews
Search Virgin Atlantic flights
DeltaPriceFrom $543Free CancellationRating
7.9
7,962 reviews
Search Delta flights
KLMPriceFrom $580Free CancellationRating
7.8
1,389 reviews
Search KLM flights
IberiaPriceFrom $615Free CancellationRating
7.0
2,967 reviews
Search Iberia flights
American AirlinesPriceFrom $626Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
British AirwaysPriceFrom $660Free CancellationRating
6.7
7,415 reviews
Search British Airways flights
United AirlinesPriceFrom $677Free CancellationRating
7.4
8,933 reviews
Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ontario to United Kingdom for you.

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

momondo does allow users to show only those flights to United Kingdom from Ontario which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Ontario to United Kingdom?

momondo provides multiple filters to help you find the best flight to United Kingdom from Ontario. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

If you are not ready to book a flight from Ontario to United Kingdom now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to United Kingdom and let you know when they change.

An easier way to manage your United Kingdom trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Sat 11/1
Sat 11/8
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to Londonfrom $307
Flights to Manchesterfrom $298
Flights to Edinburghfrom $304
Flights to Glasgowfrom $319
Flights to Birminghamfrom $297
Flights to Newcastle upon Tynefrom $382
Flights to Belfastfrom $503
Flights to Bristolfrom $450
Flights to Invernessfrom $414
Flights to Liverpoolfrom $337
Flights to Aberdeenfrom $431
Flights to Leedsfrom $321