$318+ Cheap flights from Ontario (ONT) to Heathrow (LHR)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Nov 29 — Dec 61
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Heathrow with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Heathrow
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to HeathrowExplore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
Explore the most affordable flight options available from Ontario to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 30, 2026.
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:00 am -
2 stops29h 30m
Wed 12/912:15 pm -
2 stops18h 02m
Deal found 10/28![Multiple Airlines logo]()
$798
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/266:45 am -
2 stops28h 45m
Thu 12/312:15 pm -
2 stops20h 02m
Deal found 10/28![Multiple Airlines logo]()
$806
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/76:00 am -
2 stops29h 30m
Tue 12/1512:15 pm -
2 stops18h 02m
Deal found 10/28![Multiple Airlines logo]()
$808
This Mytrip deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:06 pm -
3 stops31h 44m
Tue 12/812:15 pm -
2 stops18h 02m
Deal found 10/30![Multiple Airlines logo]()
$841
This Mytrip deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:00 am -
2 stops20h 50m
Mon 12/78:35 pm -
2 stops33h 42m
Deal found 10/29![Multiple Airlines logo]()
$842
This Mytrip deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2710:55 am -
3 stops26h 40m
Sun 12/67:55 pm -
2 stops35h 28m
Deal found 10/27![Multiple Airlines logo]()
$848
This Mytrip deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1612:01 pm -
2 stops25h 39m
Sat 11/216:40 am -
2 stops25h 44m
Deal found 10/26![Multiple Airlines logo]()
$850
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:45 am -
2 stops28h 45m
Wed 12/28:35 pm -
2 stops35h 42m
Deal found 10/28![Multiple Airlines logo]()
$851
This Mytrip deal was found by Cheapflights users on 10/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:00 am -
2 stops20h 50m
Thu 12/1012:15 pm -
2 stops20h 05m
Deal found 10/30![Multiple Airlines logo]()
$852
Best flights from Ontario to HeathrowDiscover carefully curated flight deals from Ontario to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
Discover carefully curated flight deals from Ontario to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 30, 2026.
This Alaska Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/811:57 am -
1 stop16h 23m
Wed 1/132:45 pm -
1 stop15h 56m
Deal found 10/25![Alaska Airlines logo]()
$983
This United Airlines deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/41:29 pm -
1 stop12h 11m
Tue 11/101:45 pm -
1 stop14h 30m
Deal found 10/29![United Airlines logo]()
$1,027
This British Airways deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/61:02 pm -
1 stop12h 58m
Sun 12/132:35 pm -
1 stop15h 18m
Deal found 10/25![British Airways logo]()
$1,037
This Icelandair deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/2011:15 am -
2 stops15h 35m
Wed 2/312:15 pm -
2 stops18h 26m
Deal found 10/29![Multiple Airlines logo]()
$1,087
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/1311:36 am -
1 stop16h 44m
Wed 1/202:45 pm -
1 stop15h 56m
Deal found 10/26![Alaska Airlines logo]()
$983
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/1211:36 am -
1 stop16h 44m
Thu 1/212:45 pm -
1 stop15h 56m
Deal found 10/26![Alaska Airlines logo]()
$983
This British Airways deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/114:51 pm -
1 stop12h 44m
Sun 11/151:50 pm -
1 stop15h 42m
Deal found 10/28![British Airways logo]()
$1,087
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:02 pm -
1 stop16h 18m
Tue 11/102:45 pm -
1 stop28h 33m
Deal found 10/26![Alaska Airlines logo]()
$1,034
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:02 pm -
1 stop16h 18m
Wed 11/112:45 pm -
1 stop28h 33m
Deal found 10/26![Alaska Airlines logo]()
$1,034
This Alaska Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/156:00 am -
1 stop22h 20m
Tue 12/82:45 pm -
1 stop28h 28m
Deal found 10/26![Alaska Airlines logo]()
$1,034
This Alaska Airlines deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:00 am -
1 stop22h 20m
Mon 11/232:45 pm -
1 stop16h 46m
Deal found 10/28![Alaska Airlines logo]()
$1,078
This Alaska Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:00 am -
1 stop22h 20m
Mon 1/112:45 pm -
1 stop15h 56m
Deal found 10/25![Alaska Airlines logo]()
$1,083
Last-minute flights from Ontario to HeathrowDiscover last-minute flight deals from Ontario to Heathrow. Data last updated October 30, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Heathrow. Data last updated October 30, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1612:01 pm -
2 stops25h 39m
Sat 11/216:40 am -
2 stops25h 44m
Deal found 10/26![Multiple Airlines logo]()
$850
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1612:01 pm -
2 stops21h 39m
Mon 11/236:40 am -
2 stops25h 44m
Deal found 10/28![Multiple Airlines logo]()
$891
This Mytrip deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/1612:01 pm -
2 stops25h 39m
Fri 11/206:40 am -
2 stops25h 44m
Deal found 10/25![Multiple Airlines logo]()
$902
This Mytrip deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:45 am -
2 stops28h 45m
Tue 12/812:15 pm -
2 stops18h 02m
Deal found 10/25![Multiple Airlines logo]()
$887
This Mytrip deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2410:40 pm -
3 stops35h 50m
Tue 12/16:40 am -
2 stops24h 18m
Deal found 10/27![Multiple Airlines logo]()
$901
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:45 am -
2 stops28h 45m
Wed 12/28:35 pm -
2 stops35h 42m
Deal found 10/28![Multiple Airlines logo]()
$851
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:45 am -
2 stops28h 45m
Tue 12/18:35 pm -
2 stops33h 45m
Deal found 10/28![Multiple Airlines logo]()
$882
This Mytrip deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/266:45 am -
2 stops28h 45m
Thu 12/312:15 pm -
2 stops20h 02m
Deal found 10/28![Multiple Airlines logo]()
$806
This Mytrip deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2710:55 am -
3 stops26h 40m
Sun 12/67:55 pm -
2 stops35h 28m
Deal found 10/27![Multiple Airlines logo]()
$848
One-way flights from Ontario to HeathrowSearch for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Data last updated October 30, 2026.
This Justfly.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/39:45 am -
2 stops18h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Air Canada logo]()
$318
This Justfly.com deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/301:00 pm -
2 stops18h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Virgin Atlantic logo]()
$319
This Justfly.com deal was found by Cheapflights users on 10/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/26:00 am -
2 stops17h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/29![Virgin Atlantic logo]()
$322
This Cheapflightsfares deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/164:25 pm -
1 stop13h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![British Airways logo]()
$323
This Expedia deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/214:25 pm -
1 stop13h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![British Airways logo]()
$324
This Booking.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/32:23 pm -
1 stop13h 47m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![British Airways logo]()
$325
This Justfly.com deal was found by Cheapflights users on 10/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/205:00 am -
2 stops41h 30m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/27![Air Canada logo]()
$326
This Air France deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/2412:00 pm -
1 stop13h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Air France logo]()
$329
This Booking.com deal was found by Cheapflights users on 10/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/134:52 pm -
1 stop13h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/28![British Airways logo]()
$330
This Justfly.com deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/185:00 am -
2 stops32h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Air Canada logo]()
$331
This Justfly.com deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/174:03 pm -
2 stops37h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Air Canada logo]()
$333
Find flight deals from Ontario to Heathrow
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 30, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $757 (United Airlines) |
One-way from | $318 (Justfly.com) |
Popular in | June |
Cheapest in | November |
Average price | $937 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Heathrow 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, Cheapflights users made 7,457,451 searches. Data last updated October 30, 2026.
Use the filters below to find and compare flights from Ontario to London Heathrow Airport that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 12/23
10:35 pm-6:25 am
1 stop23h 50m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$592
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 1/13
7:05 am-6:25 am
1 stop15h 20m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$685
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 12/9
11:20 am-11:15 am
1 stop15h 55m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$708
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Tue 11/24
7:00 am-12:00 pm
1 stop21h 00m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$708
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 11/25
5:00 am-9:40 am
1 stop20h 40m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$708
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 12/2
5:45 am-7:40 am
1 stop17h 55m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$708
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Mon 12/7
7:00 am-5:55 am
1 stop14h 55m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$708
Quickest round-trip
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Tue 12/8
1:40 pm-9:40 am
1 stop12h 00m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$708
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 1/13
11:15 am-10:50 am
2 stops15h 35m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$719
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Tue 12/8
11:57 am-12:20 pm
1 stop16h 23m
London Heathrow
Wed 1/13
2:45 pm-10:41 pm
1 stop15h 56m
$983
Showing 1-10 of 21 resultsSorted by cheapest first
Compare providers for flights from Ontario to Heathrow
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Ontario to Heathrow in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Ontario-London Heathrow Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-London Heathrow Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-London Heathrow Airport flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-London Heathrow Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Ontario-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Ontario to Heathrow
Have a flexible travel schedule? Discover the best time to fly to Heathrow from Ontario with our price prediction graph.
ONT-LHR
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to London Heathrow Airport
Reviews of airlines servicing Heathrow
Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated October 30, 2026.
Read through reviews of airlines operating flights from Ontario to London Heathrow Airport, such as Alaska Airlines,Delta, andVirgin Atlantic. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Crew
8.5
Entertainment
7.0
Food
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
6.0
GoodAnonymous,Jul 2026
SEA - LHR
Related info for your journey
Find useful and relevant information for your journey from Ontario to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near London Heathrow Airport?
Book flights to London Heathrow Airport if you plan to visit one of these locationsIlford
Dorking
Gatwick
Hounslow
Wembley
Harrow
Southend-on-Sea
Basingstoke
Watford
Northampton
Dartford
Winchester
Croydon
Kingston upon Thames
Chipping Norton
Slough
Eastbourne
Stansted
Sutton
Luton
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Heathrow flight routes
Other flight options
Other flights from Ontario
Popular flights
Alternative routes for Ontario to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Heathrow by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Heathrow by cabin class
Find flights from Ontario to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Heathrow
Explore flights to Heathrow departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 30, 2026.
Ontario and Heathrow flights
Browse other Ontario and Heathrow flight options. Last updated on October 30, 2026.
Other flights from Ontario
Browse through other flights departing from Ontario. Flights are based on user searches made on Cheapflights and were last updated on October 30, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 6 airlines flying from Ontario to Heathrow
Discover the top 6 airlines that operate flights from Ontario to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 30, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$488 | Average$1,051 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$615 | Average$911 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$620 | Average$640 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$710 | Average$1,020 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$725 | Average$1,234 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$806 | Average$1,592 | FlexibilityNo cancel fee | On-time75% |