LHR - ONT

$352 Find Cheap Flights from London Heathrow Airport 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 Heathrow to Ontario departing on 1/27. 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, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$542
Typical prices: $618-$1,135
Virgin Atlantic
Mon 1/12Mon 1/19
LHR - ONT • 1 stop
Cheapest one-way
$352
Multiple Airlines
Tue 1/27
LHR - ONT • 3 stops
Top airlines
Virgin Atlantic
Cheapest • from $542 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 51% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
September
Cheapest • 21% price drop
November
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s 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 Heathrow to Ontario (LHR-ONT)

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

Mon, Jan 12 - Mon, Jan 19
Virgin Atlantic Logo
12:20 pm - 10:51 pmLHR-ONT
18h 31m1 stop
Virgin Atlantic Logo
7:30 am - 11:55 amONT-LHR
20h 25m1 stop
$542Virgin Atlantic
Find Deal
Sat, Mar 7 - Sat, Mar 14
Virgin Atlantic Logo
10:45 am - 9:44 pmLHR-ONT
18h 59m1 stop
Virgin Atlantic Logo
1:20 pm - 10:00 amONT-LHR
13h 40m1 stop
$545Virgin Atlantic
Find Deal
Tue, Mar 10 - Tue, Mar 17
British Airways Logo
10:15 am - 6:42 pmLHR-ONT
15h 27m1 stop
British Airways Logo
5:02 pm - 1:15 pmONT-LHR
13h 13m1 stop
$551British Airways
Find Deal
Tue, Jan 27 - Tue, Feb 3
British Airways Logo
3:00 pm - 10:48 pmLHR-ONT
15h 48m1 stop
British Airways Logo
3:09 pm - 12:15 pmONT-LHR
13h 06m1 stop
$552British Airways
Find Deal
Sat, Jan 10 - Fri, Jan 16
Virgin Atlantic Logo
3:05 pm - 10:51 pmLHR-ONT
15h 46m1 stop
Virgin Atlantic Logo
7:30 am - 10:30 amONT-LHR
19h 00m1 stop
$553Virgin Atlantic
Find Deal
Wed, Mar 11 - Wed, Mar 25
Virgin Atlantic Logo
10:45 am - 11:54 pmLHR-ONT
20h 09m1 stop
Virgin Atlantic Logo
6:00 am - 7:50 amONT-LHR
18h 50m2 stops
$554Virgin Atlantic
Find Deal
Wed, Mar 11 - Wed, Mar 25
Delta Logo
6:30 am - 9:04 pmLHR-ONT
21h 34m2 stops
Delta Logo
5:53 pm - 8:10 pmONT-LHR
19h 17m2 stops
$555Delta
Find Deal
Tue, Jan 13 - Thu, Jan 29
British Airways Logo
6:00 am - 6:45 pmLHR-ONT
20h 45m2 stops
British Airways Logo
6:00 am - 6:50 amONT-LHR
16h 50m1 stop
$558British Airways
Find Deal
Wed, Apr 15 - Thu, Apr 23
Virgin Atlantic Logo
11:20 am - 5:16 pmLHR-ONT
13h 56m1 stop
Virgin Atlantic Logo
11:55 am - 9:00 amONT-LHR
13h 05m1 stop
$559Virgin Atlantic
Find Deal
Tue, Dec 23 - Mon, Feb 9
Delta Logo
11:45 am - 10:33 pmLHR-ONT
42h 48m2 stops
Delta Logo
10:30 pm - 6:25 amONT-LHR
23h 55m1 stop
$560Delta
Find Deal
Booking Insights

KAYAK's insights & trends for Heathrow to Ontario flights

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

How much is a round-trip flight from London Heathrow Airport to Ontario?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from London Heathrow Airport to Ontario departing in January.

What’s the cheapest day of the week to fly from London Heathrow Airport to Ontario?

The average price of all round-trip flights from London Heathrow Airport to Ontario clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Ontario on a Tuesday and more expensive on a Monday. On your return trip to London Heathrow Airport, you should consider flying back on a Wednesday, and avoid Saturdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport 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 Heathrow Airport to Ontario is September, where tickets cost $573 (return) on average. On the other hand, the most expensive months are December and April, where the average cost of round-trip tickets is $1,023 and $839 respectively.

How far in advance should I book a flight from London Heathrow Airport 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 Heathrow Airport 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 Heathrow Airport to Ontario, you should book around 2 weeks before departure, which saves you about 51% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$352
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly and prices are also 10% lower on average.
Flight from London Heathrow Airport to Ontario

When to book flights from Heathrow to Ontario

Are your dates flexible? Find out the best times to travel from Heathrow to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 London Heathrow Airport to Ontario flights

  • What is the cheapest flight from London Heathrow Airport to Ontario?

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Ontario was $352 for a one-way ticket and $542 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Ontario?

    Yes, you'll most likely have to show a valid passport before boarding the plane in London Heathrow Airport and on arrival in Ontario.

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

    London Heathrow Airport airport is called London Heathrow and the only airport in Ontario is Ontario.

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

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

  • Which airline alliances offer flights from London Heathrow Airport to Ontario?

    Star Alliance is the only airline alliance operating flights between London Heathrow Airport and Ontario.

  • How does KAYAK find such low prices on flights from London Heathrow Airport 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 Heathrow Airport to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from London Heathrow Airport 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 Heathrow Airport 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 to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and ONT can sometimes prove cheaper using this method.

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

Reviews of the top airline flying from Heathrow 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 Heathrow 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.
7.4
United AirlinesOverall score based on 9058 reviews
7.3Comfort
6.6Food
8.1Crew
7.1Entertainment
7.7Boarding
Airline reviews

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

10.0 ExcellentPaul, Nov 2025LHR - ORD
Read more United Airlines reviews

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

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

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!!

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

The internet service I paid for didn’t work at all and the flight crew was not very friendly.

Subject: Formal Complaint: Discriminatory and Unprofessional Conduct – Request for Immediate Action & Compensation Dear [Airline Customer Relations Team], I am writing to file a formal complaint regarding my recent travel experience with [Airline], which was by far the worst I have ever encountered. What occurred was not only unprofessional, but in several instances discriminatory, unsafe, and unacceptable. On the first leg of my trip, I arrived only four minutes past check-in. Instead of making any attempt to resolve the matter, your representative flatly denied me boarding and made me wait while she attended to passengers who arrived after me. By the time a manager intervened, it was too late to board, costing me time, money, and unnecessary frustration. The second leg of my trip (Chicago–San Francisco) raised even more serious concerns. From the outset, it was apparent that the staff—particularly two attendants—prioritized Caucasian passengers while dismissing African American and minority passengers. • When a Caucasian passenger in the exit row refused to comply with federal safety requirements, I, as a first responder, immediately offered to switch seats and assume the responsibility. My offer was blatantly ignored, and instead, a Caucasian passenger seated further up was chosen. This was discriminatory and deeply insulting, especially as I was actively de-escalating the situation that could have delayed the flight further. • During a lengthy tarmac delay of over 90 minutes, passengers were given conflicting and unreasonable instructions that created unnecessary distress and tension. • Throughout the flight, a visibly intoxicated passenger directly in front of me was disruptive, rude to others, failed to comply with seatbelt and electronic device rules, and yet faced no enforcement from the crew. In stark contrast, I was singled out for repeated compliance checks even though I was following every rule. This unequal treatment was so obvious that multiple passengers around me spoke up in my defense. This pattern of behavior demonstrated a clear lack of professionalism, disregard for passenger safety, and discriminatory treatment. I expect far better from an airline of your stature. As a paying customer subjected to this unacceptable treatment, I am formally requesting: 1. A full investigation into the conduct of the staff on both flights. 2. A written apology acknowledging the discriminatory and unprofessional behavior I endured. 3. Appropriate compensation for the distress, inconvenience, and mishandling of my travel. If this matter is not addressed promptly and thoroughly, I will have no choice but to escalate my complaint further, including filing with the U.S. Department of Transportation and sharing my experience through other channels. I trust [Airline] will take this complaint seriously and provide a timely resolution.

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

Information on your arrival and departure airports