LON - ONT

£278 Find Cheap Flights from London to Ontario – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Ontario departing on 7/1. 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.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest return fare
£451
Typical prices: £498-£672
United Airlines
Fri 11/12Sun 27/12
LHR - ONT • 2 stops
Cheapest one-way flight
£278
Lufthansa
Thu 7/1
LHR - ONT • 1 stop
Top airlines
Cheapest • from £451 (return)
Best reviews • 7.5 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Not available
There are currently no direct flights between London and Ontario. You’ll need at least 1 connection.
Insights
Insights
Insights
Insights
Top stopover airports
Cheapest • Avg £502 (return)
Shortest trip • 13h 46m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 21% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to Ontario (LON-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from London to Ontario

Fri, 11 Dec - Sun, 27 Dec
United Airlines Logo
09:30 - 20:20
LHR
-
ONT
18h 50m
2 stops
United Airlines Logo
13:18 - 07:25
ONT
-
LHR
34h 07m
1 stop
£451United Airlines
Mon, 24 Aug - Sun, 6 Sep
United Airlines Logo
08:40 - 20:01
LHR
-
ONT
19h 21m
2 stops
United Airlines Logo
05:00 - 12:35
ONT
-
LHR
23h 35m
1 stop
£455United Airlines
Wed, 16 Sep - Wed, 30 Sep
United Airlines Logo
08:40 - 20:01
LHR
-
ONT
19h 21m
2 stops
United Airlines Logo
05:00 - 09:40
ONT
-
LHR
20h 40m
1 stop
£455United Airlines
Sat, 26 Sep - Wed, 30 Sep
Virgin Atlantic Logo
10:55 - 16:35
LHR
-
ONT
13h 40m
1 stop
Virgin Atlantic Logo
06:20 - 15:35
ONT
-
LHR
25h 15m
1 stop
£462Virgin Atlantic
Wed, 16 Sep - Wed, 30 Sep
Virgin Atlantic Logo
11:40 - 16:35
LHR
-
ONT
36h 55m
2 stops
Virgin Atlantic Logo
13:04 - 06:45
ONT
-
LHR
33h 41m
2 stops
£462Virgin Atlantic
Wed, 16 Sep - Wed, 30 Sep
Virgin Atlantic Logo
10:55 - 16:35
LHR
-
ONT
13h 40m
1 stop
Virgin Atlantic Logo
11:54 - 11:20
ONT
-
LHR
15h 26m
1 stop
£462Virgin Atlantic
Sun, 25 Oct - Sun, 1 Nov
Alaska Airlines Logo
14:45 - 23:42
LHR
-
ONT
15h 57m
1 stop
Alaska Airlines Logo
06:00 - 12:20
ONT
-
LHR
22h 20m
1 stop
£463Alaska Airlines
Fri, 25 Sep - Fri, 2 Oct
Alaska Airlines Logo
17:00 - 23:24
LHR
-
ONT
14h 24m
1 stop
Alaska Airlines Logo
15:14 - 15:05
ONT
-
LHR
15h 51m
1 stop
£464Alaska Airlines
Mon, 30 Nov - Wed, 9 Dec
British Airways Logo
13:15 - 19:05
LHR
-
ONT
13h 50m
1 stop
British Airways Logo
14:56 - 12:00
ONT
-
LHR
13h 04m
1 stop
£478British Airways
Fri, 11 Dec - Tue, 12 Jan
British Airways Logo
14:45 - 22:19
LHR
-
ONT
15h 34m
1 stop
British Airways Logo
15:09 - 12:15
ONT
-
LHR
13h 06m
1 stop
£503British Airways
Booking Insights

KAYAK’s insights & trends for London to Ontario flights

Get data-powered insights and trends into flights from London to Ontario to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from London to Ontario?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from London to Ontario departing in December.

Flight prices are typical for this route right now.

Flights to Ontario from London usually cost between £405 and £558 in December.
The lowest price found in the past 5 days was £451 on United Airlines (11 Dec–27 Dec).

What is the cheapest month to fly from London to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Ontario, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London to Ontario is January, where tickets cost £415 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is £662 and £654 respectively.

Good to know - Cheap tickets from London to Ontario

Low season

January

Cheapest flight

£278
Best time to beat the crowds (7% less expensive on average)
Most popular time to fly (29% more expensive on average)
Flight from London Heathrow Airport to Ontario

When to book flights from London to Ontario

Are your dates flexible? Find out the best times to travel from London to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from London to Ontario

  • What is the cheapest flight from London to Ontario?

    In the last 5 days, the lowest price for a flight from London to Ontario was £278 for a one-way ticket and £451 for a return.

  • Which airports will I be using when flying from London to Ontario?

    London is served by 5 major airports and there is only 1 main airport in Ontario. You will leave London from one of these airports: London City, London Gatwick, London Heathrow, London Luton, or London Stansted. You will be arriving at Ontario.

  • Which aircraft models fly most regularly from London to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from London to Ontario?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between London and Ontario, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from London to Ontario, Virgin Atlantic or United Airlines?

    The two airlines most popular with KAYAK users for flights from London to Ontario are Virgin Atlantic and United Airlines. With an average price for the route of £668 and an overall rating of 7.5, Virgin Atlantic is the most popular choice. United Airlines is also a great choice for the route, with an average price of £647 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from London to Ontario?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from London is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to Ontario?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Ontario with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Ontario?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines flying from London to Ontario

 
See real verified KAYAK customer reviews for airlines flying from London to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from London to Ontario? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.5
Virgin AtlanticOverall score based on 694 reviews
8.1Crew
6.9Food
7.5Entertainment
7.7Boarding
7.3Comfort
Airline reviews

Lounge was top notch h with great variety of food and drinks. Cabin crew were great. Smooth flight.

10.0 ExcellentLye Sim, Jun 2026
LHR - JFK
Read more Virgin Atlantic reviews

Lounge was top notch h with great variety of food and drinks. Cabin crew were great. Smooth flight.

My seat 3G did not go down fully and the buttons were not working properly

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

Security area in terminal 3 needs to be made much nicer. Less claustrophobic and use of glass and big ceilings wouldhelp

accomodating check in staff, friendly flight crew ( a crew member was speaking tactlessly and was overfamiliar with passengers

Seats need to be updated. Allowance needs to be made for dinner service at an alternative time

If I could fly Virgin Atlantic airlines to every place, I need to go, I would. Leaving Heathrow through the special virgin air entrance, security is completely white glove service. I love this airline. From ticketing agents to flight staff everyone tries to make it a wonderful & happy flight experience. I wish other airlines copied the positive culture of Virgin Airlines.

Premium was very comfortable. Food was delicious. I had specific diet requirement and Virgin Atlantic ensured it was provided. Onboard crew was very friendly and caring. Extremely smooth journey. I wonder how upper class experience would be. Perhaps one day, I will try upper class.

On arrival to JFK it to 3.5hrs to clear immigration, as only 3 booths open. Almost missed connection

Very friendly and helpful staff on board and United was excellent when I missed my onward flight due to the delay in London. Very well organised meant much less stress

First time flying with UA and it was a great experience. Thank you

Staff on board was excellent. Positive upbeat helpful- like it used to be.

United has come a long way, it’s been a fantastic experience traveling with them.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

Cabin crew was very friendly, requests were satisfied promptly and cheerfully, and the cabin was reasonably clean when I boarded. The United lounges at Newark and Heathrow are always well-run and comfortable, especially Newark. I look forward to the new lounge that will be part of the rebuild of Terminal 2 at Heathrow.

The senior flight attendants were amazing. Totally different vibe from other carriers. Easy 10 hour flight in Business Class. Great food. Good humor as well.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Liked Seat space in Premium Plus Disliked delay, poor management of boarding groups, missed meal at landing.

I was sent an email that said my card payment was not verified. When I spoke to an agent , he said my card was not verified and the flight I thought I had to booked was no longer available so I booked another flight on another airline(United). Later I got flight updates , etc., concerning my supposed first flight. So if I was charged for this flight on British Airways/American airlines, I need a refund.

Generally very good. I think their service is better than some other big names I used to travel with. Their food variety is second to none - and you can place order beforehand. Their seating design is a bit awkward for service, I'd say. Flight attendants must be tall enough - long legs and arms - to reach the window seat passenger while crossing over the isle passenger. Also appreciated the variety on entertainment.

Lovely big plane. Excellent take off and landing. Cabin crew were so nice. Flight in time no delays

Los Angeles to London. 25th of April 2026. Business class. I was flying backwards with a complete stranger snoring next to me. In Business class. Males and females, strangers lying next to each other. Seats were backwards. I paid for comfort. I got dizziness and stress.

The crew has always been great on BA. They are very friendly and accommodating. I like that they have vegetarian options already in the menu. And the free wine is a nice perk.) I noticed (both directions of my trip) minor upgrades/ replacements needed on the plane itself (touch screen didn't work with touch; bathroom light didn't go on). However, this is one of my favorite airlines.

There was a delay for the San Francisco-London flight, but we were all informed via text and email. The staff was very friendly and nice and the food was good. I do recommend that the airline offer something without eggs or something vegan for the vegetarian meal option. A lot of Indians are lacto-vegetarian, while some could be allergic to eggs/dairy.

Crew were nice, food was good. Boarding was horrendous. We were driven around the airport in a bus forced to climb a long flight of very steep stairs with no adequate handrails to board the plane . In many many years of flying to the US I have never been required to do this . There was no assistance for those needing help getting up the stairs to the plane. A fellow passenger helped me. No idea how other elderly, physically limited passengers or those with young children managed . It was a full flight with crowds trying to get up the stairs. It was an accident waiting to happen.

Horrible, the plane is just old and junky...Filthy restroom, seat was as hard as rock. The food, mystery side dish, inedible..geez..just Horrible. Never flying BA again

the service on Business class should be improved to be at par with industry leaders like Cathay Pacific and Singapore AIrlines. A lot of room for improvement.

Entertainment devices on A380 need to be fixed, the seats might do with updates.

Everything you need to know for your flight from London to Ontario

Information on your arrival and departure airports