$443 Find Cheap Flights from the United Kingdom to Ontario

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 7/2. 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 for flights to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
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Flight Deals

Cheap Flights from the United Kingdom to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from the United Kingdom 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 round-trip flight deals from the United Kingdom to Ontario

Thu, Jul 2 - Fri, Jul 24
United Airlines Logo
1:40 pm - 9:55 pm
LHR
-
ONT
16h 15m
1 stop
United Airlines Logo
5:45 am - 7:55 am
ONT
-
LHR
18h 10m
1 stop
$443United Airlines
Thu, Jul 9 - Fri, Jul 17
United Airlines Logo
6:55 am - 8:42 pm
LHR
-
ONT
21h 47m
2 stops
United Airlines Logo
5:45 am - 8:40 pm
ONT
-
LHR
30h 55m
2 stops
$559United Airlines
Mon, Sep 7 - Mon, Sep 28
United Airlines Logo
6:55 am - 6:11 pm
LHR
-
ONT
19h 16m
2 stops
United Airlines Logo
5:00 am - 9:40 am
ONT
-
LHR
20h 40m
1 stop
$560United Airlines
Wed, Jul 1 - Thu, Jul 30
Lufthansa Logo
4:15 pm - 12:12 pm
LHR
-
ONT
27h 57m
1 stop
Lufthansa Logo
6:10 am - 6:45 am
ONT
-
LHR
16h 35m
1 stop
$580Lufthansa
Thu, Jul 2 - Thu, Jul 30
Air Canada Logo
5:40 pm - 8:42 pm
LHR
-
ONT
35h 02m
2 stops
Air Canada Logo
5:00 am - 10:00 am
ONT
-
LHR
21h 00m
2 stops
$589Air Canada
Fri, Jun 26 - Thu, Jul 9
Lufthansa Logo
1:40 pm - 9:55 pm
LHR
-
ONT
16h 15m
1 stop
Lufthansa Logo
1:18 pm - 12:25 pm
ONT
-
LHR
15h 07m
1 stop
$591Lufthansa
Tue, Jun 30 - Mon, Aug 3
American Airlines Logo
12:20 pm - 10:36 pm
LGW
-
ONT
42h 16m
2 stops
American Airlines Logo
1:11 pm - 6:35 am
ONT
-
LGW
33h 24m
2 stops
$617American Airlines
Tue, Oct 6 - Tue, Oct 20
British Airways Logo
8:35 am - 9:08 pm
GLA
-
ONT
20h 33m
2 stops
British Airways Logo
12:35 pm - 4:45 pm
ONT
-
GLA
20h 10m
2 stops
$673British Airways
Tue, Nov 24 - Tue, Dec 15
British Airways Logo
7:40 am - 9:59 pm
MAN
-
ONT
22h 19m
2 stops
British Airways Logo
10:47 am - 4:30 pm
ONT
-
MAN
21h 43m
2 stops
$717British Airways
Wed, Jul 1 - Fri, Jul 10
Air Canada Logo
9:00 am - 12:47 pm
MAN
-
ONT
35h 47m
2 stops
Air Canada Logo
1:50 pm - 6:30 am
ONT
-
MAN
32h 40m
2 stops
$726Air Canada
Booking Insights

KAYAK's insights & trends for flights to Ontario

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

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights 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, you should book around 2 weeks before departure, which saves you about 34% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know

Low seasonMay
Cheapest flight$443
Best time to beat the crowds with an average 18% drop in price.
Most popular time to fly and prices are also 3% lower on average.
Flight from London Heathrow Airport to Ontario

FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    You’ll need to travel 3 miles to reach the Ontario city center from Ontario Airport.

  • What is the name of Ontario’s airport?

    All flights to Ontario land at Ontario Airport. The airport code is ONT,and it can also be referred to as Ontario or Ontario Intl.

  • How does KAYAK find such low prices on flights 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 to Ontario.

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

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

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

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

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight 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 up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • How many direct flights to Ontario are there each week?

    Each week there are around 1,046 direct flights from within United Kingdom to Ontario. The most common day for departures is Sunday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to Ontario

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.

Reviews of the top airline flying from the United Kingdom to Ontario

 
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from the United Kingdom to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with 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.
6.7
British AirwaysOverall score based on 8050 reviews
6.4Entertainment
7.7Crew
6.8Comfort
6.9Boarding
6.4Food
Airline reviews

Seats not as comfortable as I had hoped. Food was very nice, service was fine. Entertainment options very nice. Had thought the premium economy was a more plus 2-3-2 layout but it was a 2-4-2 with seats not as wide as I had expected.

8.0 ExcellentEric, Jun 2026
LHR - LAS
Read more British Airways reviews

Seats not as comfortable as I had hoped. Food was very nice, service was fine. Entertainment options very nice. Had thought the premium economy was a more plus 2-3-2 layout but it was a 2-4-2 with seats not as wide as I had expected.

I flew four flights on British Airways within two weeks. I was unable to download the boarding pass to my phone for any of the four flights. I could check-in for my flight but the system would not give me boarding pass. I tried multiple ways and multiple times. I discovered many other passengers also had the same issue with their boarding passes. No explanation or acknowledgement by BA.

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

Because our ABZ-LHR flight was cancelled by BA for reasons they refuse to tell us--not weather--we did not make this flight and were booked on the following day. BA offered no assistance to us on the phone or in the airport, and we had to find a hotel at Heathrow on our own.

Horrible - flight was delayed by 6 hours - we boarded, were made to de-board due some technical fault; aircraft changed; special meals request on new flight - all went awry. Landed in Dulles airport; breezed thru immigration; as Business Class passengers or baggage was delivered almost 90 minutes after landing; air tags indicated the bags were just near the carousel but the unhelpful BA staff - Maria and Ghina refused to give any update - palming it off on some imaginary invisible “manager” despite air tags evidence showing it right there. So about 50-60 passengers waiting and getting infuriatingly impatient for their bags coz one container was not delivered. Finally after much argument by some other passengers Maria condescended to go to the “ramp” and within 5 minutes the baggage was delivered miraculously. Question is why couldn’t she have done it one hour earlier ? Poor poor experience once again on Business Class BA.

Cheap Flight Fares would not provide booking info. I canceled the reservation and we arbitrated with American Express. They provided erroneous info to Amex and it was determined that C.F.F. deserved the price of the ticket. Worse experience I've ever had.

Seating space is appalling. Seats and all surrounding area in "Economy" is built for individuals shorter than 4' 10" and below 120 lbs. Ridiculous. While I'm not expecting fine dining, the food was the worst airplane food that I can recall.

Business class lounge for my gate was closed and no email was sent, causing me to walk back and forth to different gates, etc for over 20 minutes one way. Flight entertainment was mediocre with very poor choices especially for business class cabin. Original flight was cancelled and rebooking was difficult and no reason given for cancellation.

Very comfortable flight and simple and directed one way and back. Amazing price.

We loved our flight attendant, Emma from Scotland, the meal and entertainment offerings were wonderful, the flight was smooth, and enough leg room to stretch. We would fly with you again!

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario