LON - ONT

£319 Find Cheap Flights from London to Ontario

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 11/3. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario.
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Everything you should know

Cheapest return fare
£342
Overall average: £503
United Airlines
Fri 13/3Fri 20/3
LHR - ONT • 2 stops
Cheapest one-way flight
£319
United Airlines
Wed 11/3
LHR - ONT • 2 stops
Video guide: How to find cheap flights to Ontario
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Top airlines
United Airlines
Cheapest • from £342 (return)
Finnair
Best reviews • 7.6 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 48% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 22% price drop
December
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
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KAYAK searches hundreds of sites at once to find you the best travel deals.
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, 13 Mar - Fri, 20 Mar
United Airlines Logo
08:30 - 22:18
LHR
-
ONT
20h 48m
2 stops
United Airlines Logo
13:40 - 07:25
ONT
-
LHR
34h 45m
1 stop
£342United Airlines
Fri, 13 Mar - Fri, 20 Mar
Virgin Atlantic Logo
12:20 - 22:33
LHR
-
ONT
17h 13m
1 stop
Virgin Atlantic Logo
22:25 - 07:50
ONT
-
LHR
26h 25m
1 stop
£354Virgin Atlantic
Fri, 13 Mar - Fri, 20 Mar
United Airlines Logo
08:30 - 22:18
LHR
-
ONT
20h 48m
2 stops
United Airlines Logo
23:59 - 06:40
ONT
-
LHR
23h 41m
2 stops
£356United Airlines
Thu, 26 Feb - Thu, 5 Mar
Virgin Atlantic Logo
14:30 - 22:37
LHR
-
ONT
16h 07m
1 stop
Virgin Atlantic Logo
07:30 - 11:55
ONT
-
LHR
20h 25m
1 stop
£360Virgin Atlantic
Thu, 26 Feb - Thu, 5 Mar
United Airlines Logo
10:05 - 17:41
LHR
-
ONT
15h 36m
1 stop
United Airlines Logo
13:40 - 12:00
ONT
-
LHR
14h 20m
1 stop
£365United Airlines
Sun, 15 Mar - Mon, 30 Mar
United Airlines Logo
11:35 - 20:57
LHR
-
ONT
16h 22m
1 stop
United Airlines Logo
13:34 - 12:20
ONT
-
LHR
14h 46m
1 stop
£366United Airlines
Thu, 19 Mar - Wed, 1 Apr
Delta Logo
06:30 - 22:34
LHR
-
ONT
23h 04m
2 stops
Delta Logo
11:59 - 15:35
ONT
-
LHR
19h 36m
1 stop
£369Delta
Mon, 27 Apr - Sat, 9 May
Delta Logo
10:25 - 22:37
LGW
-
ONT
20h 12m
2 stops
Delta Logo
14:00 - 16:00
ONT
-
LGW
18h 00m
2 stops
£391Delta
Wed, 25 Feb - Wed, 18 Mar
Iberia Logo
07:50 - 22:49
LCY
-
ONT
22h 59m
2 stops
Iberia Logo
10:56 - 14:05
ONT
-
LCY
20h 09m
2 stops
£451Iberia
Wed, 25 Feb - Mon, 2 Mar
Iberia Logo
07:50 - 22:49
LCY
-
ONT
22h 59m
2 stops
Iberia Logo
10:56 - 14:35
ONT
-
LCY
19h 39m
2 stops
£510Iberia
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.

Find cheap flights to Ontario
Find cheap flights to Ontario

Planning a trip from London to Ontario? KAYAK’s data-powered insights will help you find cheap flights. Learn the best time to fly, how early to book your ticket, and other tips to secure great prices.

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 March.

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 £396 (return) on average. On the other hand, the most expensive months are July and April, where the average cost of round-trip tickets is £755 and £602 respectively.

How far in advance should I book a flight from London to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure 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 average of all the values for each week.

To get a below average price on the flight from London to Ontario, you should book around 2 weeks before departure, which saves you about 48% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know - Cheap tickets from London to Ontario

Low seasonNovember
Cheapest flight£319
Best time to beat the crowds (3% less expensive on average)
Most popular time to fly (16% 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 3 days, the lowest price for a flight from London to Ontario was £319 for a one-way ticket and £342 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, KLM or Finnair?

    The two airlines most popular with KAYAK users for flights from London to Ontario are KLM and Finnair. With an average price for the route of £539 and an overall rating of 7.7, KLM is the most popular choice. Finnair is also a great choice for the route, with an average price of £468 and an overall rating of 7.6.

  • 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 5 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.
7.6
FinnairOverall score based on 1356 reviews
7.7Boarding
6.7Food
8.2Crew
6.9Entertainment
7.5Comfort
Airline reviews

Very good seat, very comfortable, good food, and good service.

10.0 ExcellentSunny, Jan 2026
HEL - DEL
Read more Finnair reviews

Very good seat, very comfortable, good food, and good service.

It was a good flight, very comfortable seats for sleeping in business class. Probably the most comfortable business class seat I've ever had (20+ times in business class on various airlines). Service was good, but the only downside is my screen didn't work and it had to be reset multiple times to get it to shut off. I had to block my eyes because the screen was white almost the entire flight and I wore an eye mask when I slept. But when eating and reading in my seat, my eyes hurt because the only way to turn the screen off was reset it and the screen would only be off for a few minutes at a time.

All reviews good because...flight from BWI to London ,economy seats was miserable. I usually book 1,step up from economy but this would have added 1500 bucks 1 way. Bit the bullet and upgraded for retun flight, otherwise all ratings would have been rock bottom.

Great. It was awesome to have boarding from the front and back of the plane as it made the process go very quickly

It was okay. The airplane was a little smaller than a flight from Thailand to Helsinki.

Wish that everyone would board the back of the plane first. Also let kids on first. The gate wasn’t open at arrival and we waited 45 minutes to takeoff. They made up for time in the air.

This was an absolutely exceptional flight. The flight attendants were extremely attentive and very friendly. They seemed to go out of their way to make us comfortable and to make sure that we had everything we needed., We were in business and were very happy with the size and the details for our pods. We would definitely recommend Finnair and will definitely be flying with them again.

We had an excellent trip with Finnair. This was our first time and we’re very pleased. The only issue was with the boarding - it was a little bit confusing and needs a little bit of streamlining.

Crew very lovely. Arrived an hour late due to bad weather. We were given new tickets to an other flight but it could have been organised better, so we did not have to run through the whole airport to.

Flight delayed over an hour. They said they would hold our connection but then did not.

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

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

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

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

Great crew - old style upper class seats on the older fleet now feels dated

Premium economy more comfortable than economy, but not by much. Did was awful, do not try the omelette. Flight crew were helpful. Flight was delayed by over an hour. Overall but bad, arrived safely and thank God.

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Mean flight attendant. I wanted to reuse my plastic cup, but he (Matthew) said he can't for safety. I then said "I don't want water then" and he poured me a glass. I hope Matthew gets herpes and spends the rest of his life poor, lonely, and homeless.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Both flights delayed. 2nd flight over 3 hours late mechanical issues

Flight was delayed 45 minutes because originating flight was coming from Newark. No complimentary snacks were offered on this 5+ hour flight. No screens for the flight, but movies offered if you had already downloaded the United app (which I hadn't on my ipad). No USB ports, only a flimsy plug-in port near the bottom of the seat that was hard to see and kept coming unplugged.

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Patrick and the whole crew were amazing! Hope to have this team for all my European trips.

Smooth flight with enough time for connection. Ran out of meal options. In-flight and gate staff were friendly and helpful. Good service overall.

Paid for exit row at the back of the plane. Window seat with lots of leg space. Food was inedible (as usual). Brought my own.

They don’t give information on why a flight is delayed in a timely manner. Very frustrating.

The plane (Mitsubishi CRJ) felt old, creaking and not very new. The crew was okay. Hot water provision was broken so hot beverages could't be served.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

Never happened. Flight was delayed. Had to be re rojyed

Lufthansa is my favorite airline and have flown oversea with them for the past 25 years: i always found them so professional and incredibly efficient from checking in to arrival. I also love their Munich or Frankfurt airports.

We paid for business class, and my seat did not work at all. Each time I wanted to adjust the position, an attendant had to come to physically force the seat into its new position. They tried to fix it by fiddling with the electronics (military reset, for example), to no avail. Also, the food was just mediocre. We were at the end of a serving section, so they ran out of several choices. (This was on the flight from Los Angeles to Munich.)

The flight was delayed by an hour. Made the connection uncomfortably tight.

My touch screen at my seat wasn't working, the films BA advertised on the website for this flight were not available, and the plane was a little dated, food was good and the staff were good, just let down by the aircraft facilities.

Did not like the seating configuration at all with 2+3+2 in business class. Lacking total privacy and comfort

Check-in experience, for business call please provide a premium experience

Lost my luggage, ran out of food choices in business class, ground crew was completely unapologetic.

Excellent. The crew and flight were great. Checking in was easy and everyone was very helpful.

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

Everything. Employees offered to help me because I had to use a cane.

Check-in and boarding were great. On flight staff were rude and disrespectful. Paid for extra room and found it incredibly cramped. Bathrooms kept in poor condition. Overall negative experience.

Great seat in premium economy, great food and drinks throughout lots of in flight entertainment. 1 hour 40 min delayed flying out , 2 1/2 hour wait at passport control in tampa

My seat cushion was poor. The cushion was compressed and was uncomfortable for such a long flight.

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

Information on your arrival and departure airports