$282+ Cheap flights from Ontario (ONT) to Heathrow (LHR)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Sep 2 — Sep 91
Round-trip
1 adult, Economy
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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
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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 August 3, 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 August 3, 2026.
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Mon 11/96:37 pm
ONT
- LHR
1 stop28h 48m
United Airlines
Thu 11/126:50 am
LHR
- ONT
2 stops19h 57m
United Airlines
Deal found 7/29![United Airlines logo]()
$736
This Expedia deal was found by Cheapflights users on 7/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:00 am
ONT
- LHR
1 stop22h 20m
Alaska Airlines
Wed 12/22:45 pm
LHR
- ONT
1 stop28h 24m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$790
This Priceline deal was found by Cheapflights users on 7/30. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:00 am
ONT
- LHR
1 stop22h 20m
Alaska Airlines
Tue 11/102:45 pm
LHR
- ONT
1 stop16h 09m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$799
This Priceline deal was found by Cheapflights users on 7/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1112:42 pm
ONT
- LHR
1 stop13h 18m
Multiple Airlines
Mon 11/162:45 pm
LHR
- ONT
1 stop16h 09m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$800
This Priceline deal was found by Cheapflights users on 8/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/510:42 pm
ONT
- LHR
1 stop14h 03m
Multiple Airlines
Fri 10/95:00 pm
LHR
- ONT
1 stop14h 42m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$803
This Expedia deal was found by Cheapflights users on 7/30. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2010:39 pm
ONT
- LHR
1 stop14h 06m
Multiple Airlines
Sun 9/275:00 pm
LHR
- ONT
1 stop34h 03m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$805
This Priceline deal was found by Cheapflights users on 7/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:00 am
ONT
- LHR
1 stop22h 20m
Alaska Airlines
Tue 12/12:45 pm
LHR
- ONT
1 stop32h 02m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$806
This Priceline deal was found by Cheapflights users on 7/30. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/144:09 pm
ONT
- LHR
1 stop36h 11m
Alaska Airlines
Sat 11/212:45 pm
LHR
- ONT
1 stop16h 19m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$810
This Priceline deal was found by Cheapflights users on 7/31. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/77:10 pm
ONT
- LHR
1 stop33h 10m
Alaska Airlines
Sat 11/212:45 pm
LHR
- ONT
1 stop16h 19m
Alaska Airlines
Deal found 7/31![Alaska Airlines logo]()
$811
This Expedia deal was found by Cheapflights users on 7/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/1510:39 pm
ONT
- LHR
1 stop14h 06m
Multiple Airlines
Tue 9/228:55 am
LHR
- ONT
1 stop17h 58m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$815
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 August 3, 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 August 3, 2026.
This United Airlines deal was found by Cheapflights users on 7/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:37 pm
ONT
- LHR
1 stop28h 48m
United Airlines
Thu 11/126:50 am
LHR
- ONT
2 stops19h 57m
United Airlines
Deal found 7/30![United Airlines logo]()
$736
This Alaska Airlines deal was found by Cheapflights users on 7/29. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/212:00 pm
ONT
- LHR
1 stop16h 20m
Alaska Airlines
Wed 12/92:45 pm
LHR
- ONT
1 stop15h 54m
Alaska Airlines
Deal found 7/29![Alaska Airlines logo]()
$876
This JetBlue deal was found by Cheapflights users on 7/30. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:13 pm
ONT
- LHR
1 stop13h 32m
JetBlue
Sat 9/128:15 am
LHR
- ONT
1 stop20h 42m
JetBlue
Deal found 7/30![JetBlue logo]()
$893
This Icelandair deal was found by Cheapflights users on 8/1. 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 10/2110:25 am
ONT
- LHR
2 stops17h 30m
Multiple Airlines
Fri 11/612:15 pm
LHR
- ONT
2 stops18h 25m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$1,025
This United Airlines deal was found by Cheapflights users on 7/28. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/299:25 am
ONT
- LHR
1 stop14h 00m
United Airlines
Wed 12/1610:05 am
LHR
- ONT
1 stop15h 42m
United Airlines
Deal found 7/28![United Airlines logo]()
$894
This JetBlue deal was found by Cheapflights users on 7/29. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/910:39 pm
ONT
- LHR
1 stop14h 06m
JetBlue
Wed 9/168:15 am
LHR
- ONT
1 stop20h 42m
JetBlue
Deal found 7/29![JetBlue logo]()
$894
This United Airlines deal was found by Cheapflights users on 7/29. 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.
Sun 11/299:25 am
ONT
- LHR
1 stop14h 00m
United Airlines
Fri 12/410:25 am
LHR
- ONT
1 stop16h 19m
United Airlines
Deal found 7/29![United Airlines logo]()
$894
This JetBlue deal was found by Cheapflights users on 8/2. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1410:39 pm
ONT
- LHR
1 stop14h 06m
JetBlue
Mon 9/218:15 am
LHR
- ONT
1 stop20h 42m
JetBlue
Deal found 8/2![JetBlue logo]()
$895
This Alaska Airlines deal was found by Cheapflights users on 8/1. 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.
Sat 8/293:07 pm
ONT
- LHR
1 stop15h 58m
Alaska Airlines
Wed 9/305:00 pm
LHR
- ONT
1 stop26h 16m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$1,047
This United Airlines deal was found by Cheapflights users on 7/31. 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.
Sun 11/299:25 am
ONT
- LHR
1 stop14h 00m
United Airlines
Sun 12/610:05 am
LHR
- ONT
1 stop15h 42m
United Airlines
Deal found 7/31![United Airlines logo]()
$944
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 8/1812:04 pm
ONT
- LHR
1 stop19h 01m
Alaska Airlines
Fri 8/285:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$1,088
This Alaska Airlines deal was found by Cheapflights users on 7/28. 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.
Tue 8/185:26 pm
ONT
- LHR
1 stop13h 39m
Alaska Airlines
Wed 8/265:00 pm
LHR
- ONT
1 stop26h 04m
Alaska Airlines
Deal found 7/28![Alaska Airlines logo]()
$1,094
Last-minute flights from Ontario to HeathrowDiscover last-minute flight deals from Ontario to Heathrow. Data last updated August 3, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Heathrow. Data last updated August 3, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/311:51 pm
ONT
- LHR
1 stop25h 39m
JetBlue
Thu 8/208:15 am
LHR
- ONT
1 stop22h 23m
JetBlue
Deal found 7/30![JetBlue logo]()
$940
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1311:59 pm
ONT
- LHR
1 stop25h 31m
JetBlue
Thu 8/2011:55 am
LHR
- ONT
1 stop18h 43m
JetBlue
Deal found 7/30![JetBlue logo]()
$889
This JetBlue deal was found by Cheapflights users on 7/30. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:13 pm
ONT
- LHR
1 stop13h 32m
JetBlue
Sat 9/128:15 am
LHR
- ONT
1 stop20h 42m
JetBlue
Deal found 7/30![JetBlue logo]()
$893
This JetBlue deal was found by Cheapflights users on 7/30. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:13 pm
ONT
- LHR
1 stop13h 32m
JetBlue
Fri 8/218:15 am
LHR
- ONT
1 stop22h 23m
JetBlue
Deal found 7/30![JetBlue logo]()
$943
This Justfly.com deal was found by Cheapflights users on 7/29. 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.
Fri 8/2111:59 pm
ONT
- LHR
1 stop25h 31m
JetBlue
Fri 8/288:15 am
LHR
- ONT
1 stop22h 23m
JetBlue
Deal found 7/29![JetBlue logo]()
$951
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:13 pm
ONT
- LHR
1 stop13h 32m
JetBlue
Tue 9/811:55 am
LHR
- ONT
1 stop18h 42m
JetBlue
Deal found 7/30![JetBlue logo]()
$883
This CheapOair deal was found by Cheapflights users on 7/30. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:13 pm
ONT
- LHR
1 stop13h 32m
Multiple Airlines
Tue 9/85:40 pm
LHR
- ONT
2 stops32h 36m
Multiple Airlines
Deal found 7/30![Multiple Airlines logo]()
$894
This JetBlue deal was found by Cheapflights users on 8/1. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:13 pm
ONT
- LHR
1 stop13h 32m
JetBlue
Sat 8/298:15 am
LHR
- ONT
1 stop21h 44m
JetBlue
Deal found 8/1![JetBlue logo]()
$945
This Iberia deal was found by Cheapflights users on 7/29. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/262:27 pm
ONT
- LHR
1 stop15h 58m
Iberia
Wed 9/29:15 am
LHR
- ONT
2 stops21h 44m
Iberia
Deal found 7/29![Iberia logo]()
$934
This United Airlines deal was found by Cheapflights users on 7/29. 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 8/266:08 am
ONT
- LHR
2 stops18h 22m
United Airlines
Wed 9/28:40 am
LHR
- ONT
2 stops19h 21m
United Airlines
Deal found 7/29![United Airlines logo]()
$944
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 August 3, 2026.
Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Data last updated August 3, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:05 pm
ONT
- LHR
3 stops31h 00m
Multiple Airlines
Deal found 7/31![Multiple Airlines logo]()
$282
This oojo deal was found by Cheapflights users on 7/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/274:29 pm
ONT
- LHR
1 stop12h 46m
British Airways
Deal found 7/29![British Airways logo]()
$322
This Goibibo deal was found by Cheapflights users on 7/29. 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 Goibibo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/271:24 pm
ONT
- LHR
1 stop13h 36m
Virgin Atlantic
Deal found 7/29![Virgin Atlantic logo]()
$323
This Trip.com deal was found by Cheapflights users on 8/1. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/16:00 am
ONT
- LHR
1 stop22h 20m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$325
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1811:05 pm
ONT
- LHR
1 stop13h 40m
JetBlue
Deal found 7/30![JetBlue logo]()
$326
This American Airlines deal was found by Cheapflights users on 8/1. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/109:59 am
ONT
- LHR
1 stop18h 16m
American Airlines
Deal found 8/1![American Airlines logo]()
$327
This KAYAK deal was found by Cheapflights users on 7/30. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2010:39 pm
ONT
- LHR
1 stop14h 06m
JetBlue
Deal found 7/30![JetBlue logo]()
$328
This United Airlines deal was found by Cheapflights users on 7/29. 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 11/119:25 am
ONT
- LHR
1 stop17h 50m
United Airlines
Deal found 7/29![United Airlines logo]()
$329
This Air Canada deal was found by Cheapflights users on 8/1. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/117:00 am
ONT
- LHR
2 stops15h 30m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$333
This Air Canada deal was found by Cheapflights users on 8/1. 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 Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/87:00 am
ONT
- LHR
2 stops15h 30m
Multiple Airlines
Deal found 8/1![Multiple Airlines logo]()
$335
This Air Canada deal was found by Cheapflights users on 7/29. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/279:25 am
ONT
- LHR
2 stops16h 05m
Multiple Airlines
Deal found 7/29![Multiple Airlines logo]()
$336
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 August 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $736 (United Airlines) |
One-way from | $282 (Kiwi.com) |
Popular in | June |
Cheapest in | November |
Average price | $924 |
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 2,558,603 searches. Data last updated August 3, 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 - LHR
ONTLHR
Ontario
Mon 11/9
6:37 pm-7:25 am
1 stop28h 48m
London Heathrow
Thu 11/12
6:50 am-6:47 pm
2 stops19h 57m
$736
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 12/2
12:00 pm-12:20 pm
1 stop16h 20m
London Heathrow
Wed 12/9
2:45 pm-10:39 pm
1 stop15h 54m
$876
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sat 8/15
11:13 pm-8:45 pm
1 stop13h 32m
London Heathrow
Sat 9/12
8:15 am-8:57 pm
1 stop20h 42m
$893
Quickest round-trip
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 11/29
9:25 am-7:25 am
1 stop14h 00m
London Heathrow
Wed 12/16
10:05 am-5:47 pm
1 stop15h 42m
$894
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 9/9
10:39 pm-8:45 pm
1 stop14h 06m
London Heathrow
Wed 9/16
8:15 am-8:57 pm
1 stop20h 42m
$894
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 11/29
9:25 am-7:25 am
1 stop14h 00m
London Heathrow
Fri 12/4
10:25 am-6:44 pm
1 stop16h 19m
$894
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Mon 9/14
10:39 pm-8:45 pm
1 stop14h 06m
London Heathrow
Mon 9/21
8:15 am-8:57 pm
1 stop20h 42m
$895
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 11/29
9:25 am-7:25 am
1 stop14h 00m
London Heathrow
Sun 12/6
10:05 am-5:47 pm
1 stop15h 42m
$944
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 10/21
10:25 am-11:55 am
2 stops17h 30m
London Heathrow
Fri 11/6
12:15 pm-10:40 pm
2 stops18h 25m
$1,025
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sat 8/29
3:07 pm-3:05 pm
1 stop15h 58m
London Heathrow
Wed 9/30
5:00 pm-11:16 am
1 stop26h 16m
$1,047
Showing 1-10 of 24 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 August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*1 star | |
| Price Accuracy3 stars | Trust Score*2 stars | |
| Price Accuracy3 stars | Trust Score*3 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
What is the cheapest month to book a flight from Ontario to London Heathrow Airport?
Currently, November is the cheapest month in which you can book a flight from Ontario to London Heathrow Airport (average of $624). Flying from Ontario to London Heathrow Airport in June is currently the most expensive (average of $1,592). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
How much does it cost to fly round-trip from Ontario to London Heathrow Airport?
Airfare is below average for this route at the moment.
Ontario to London Heathrow Airport flights typically cost between $884 and $1,051 in November.The cheapest round-trip price found within the last 5 days was $736 on United Airlines (Nov 9-Nov 12).
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 August 3, 2026.
Read through reviews of airlines operating flights from Ontario to London Heathrow Airport, such as Delta,Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Overall
7.8
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Overall
7.8
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Overall
7.8
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Overall
7.8
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Overall
7.8
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Overall
7.8
Crew
8.5
Boarding
8.1
Comfort
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - 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
Hounslow
Winchester
Croydon
Gatwick
Wembley
Harrow
Eastleigh
Southend-on-Sea
Watford
Northampton
Dartford
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
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Alternative routes for Ontario to Heathrow
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Complete your trip
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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 August 3, 2026.
Ontario and Heathrow flights
Browse other Ontario and Heathrow flight options. Last updated on August 3, 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 August 3, 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 2,558,603 searches. Data last updated August 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$329 | Average$756 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$469 | Average$646 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$535 | Average$788 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$620 | Average$650 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$665 | Average$1,234 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$806 | Average$1,592 | FlexibilityNo cancel fee | On-time75% |