$319+ 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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LHR
Jul 4 — Jul 111
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
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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 June 4, 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 June 4, 2026.
This Expedia deal was found by Cheapflights users on 6/3. 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 9/271:05 pm
ONT
- LHR
1 stop18h 00m
Multiple Airlines
Wed 10/710:50 am
LHR
- ONT
2 stops20h 16m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$826
This Expedia deal was found by Cheapflights users on 6/1. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/271:05 pm
ONT
- LHR
1 stop18h 00m
British Airways
Wed 10/78:55 am
LHR
- ONT
1 stop20h 13m
British Airways
Deal found 6/1![British Airways logo]()
$828
This Priceline deal was found by Cheapflights users on 6/3. 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 12/712:00 pm
ONT
- LHR
1 stop16h 20m
Multiple Airlines
Sun 12/132:20 pm
LHR
- ONT
1 stop15h 40m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$829
This Orbitz deal was found by Cheapflights users on 6/2. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1110:47 am
ONT
- LHR
1 stop17h 28m
Multiple Airlines
Wed 11/187:40 pm
LHR
- ONT
2 stops34h 43m
Multiple Airlines
Deal found 6/2![Multiple Airlines logo]()
$831
This Expedia deal was found by Cheapflights users on 6/3. 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 11/36:00 am
ONT
- LHR
2 stops17h 10m
Multiple Airlines
Tue 11/1011:45 am
LHR
- ONT
1 stop17h 26m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$832
This Orbitz deal was found by Cheapflights users on 6/4. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/16:00 am
ONT
- LHR
2 stops16h 35m
Multiple Airlines
Sat 9/128:55 am
LHR
- ONT
1 stop21h 42m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$837
This The Travel House deal was found by Cheapflights users on 6/1. 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 The Travel House is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/26:02 am
ONT
- LHR
1 stop25h 03m
Alaska Airlines
Wed 9/165:00 pm
LHR
- ONT
1 stop29h 16m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$841
This Orbitz deal was found by Cheapflights users on 6/1. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/47:13 pm
ONT
- LHR
2 stops51h 17m
Multiple Airlines
Mon 9/144:25 pm
LHR
- ONT
1 stop25h 04m
Multiple Airlines
Deal found 6/1![Multiple Airlines logo]()
$842
This Priceline deal was found by Cheapflights users on 6/3. 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 11/154:47 pm
ONT
- LHR
1 stop12h 28m
Multiple Airlines
Fri 11/272:45 pm
LHR
- ONT
1 stop15h 54m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$845
This Orbitz deal was found by Cheapflights users on 6/3. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/52:43 pm
ONT
- LHR
1 stop31h 37m
Iberia
Sat 10/38:00 pm
LHR
- ONT
2 stops35h 36m
Iberia
Deal found 6/3![Iberia logo]()
$848
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 June 4, 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 June 4, 2026.
This Delta deal was found by Cheapflights users on 6/3. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/36:00 am
ONT
- LHR
1 stop20h 00m
Delta
Thu 8/206:30 am
LHR
- ONT
2 stops23h 22m
Delta
Deal found 6/3![Delta logo]()
$866
This Alaska Airlines deal was found by Cheapflights users on 5/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/512:04 pm
ONT
- LHR
1 stop19h 01m
Alaska Airlines
Fri 8/215:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 5/31![Alaska Airlines logo]()
$923
This United Airlines deal was found by Cheapflights users on 6/3. 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 7/271:18 pm
ONT
- LHR
1 stop12h 22m
United Airlines
Wed 8/122:50 pm
LHR
- ONT
1 stop14h 03m
United Airlines
Deal found 6/3![United Airlines logo]()
$967
This Delta deal was found by Cheapflights users on 5/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/196:00 am
ONT
- LHR
2 stops18h 45m
Delta
Sun 11/226:30 am
LHR
- ONT
2 stops18h 47m
Delta
Deal found 5/30![Delta logo]()
$971
This Alaska Airlines deal was found by Cheapflights users on 5/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/62:05 pm
ONT
- LHR
1 stop17h 00m
Alaska Airlines
Fri 8/215:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 5/31![Alaska Airlines logo]()
$973
This Alaska Airlines deal was found by Cheapflights users on 5/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/105:26 pm
ONT
- LHR
1 stop13h 39m
Alaska Airlines
Mon 8/245:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 5/31![Alaska Airlines logo]()
$973
This Delta deal was found by Cheapflights users on 6/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:05 am
ONT
- LHR
1 stop22h 10m
Delta
Wed 7/298:55 am
LHR
- ONT
2 stops21h 57m
Delta
Deal found 6/4![Delta logo]()
$1,022
This Alaska Airlines deal was found by Cheapflights users on 6/1. 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.
Sun 9/63:07 pm
ONT
- LHR
1 stop15h 58m
Alaska Airlines
Sun 9/205:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$1,001
This Alaska Airlines deal was found by Cheapflights users on 6/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/89:20 pm
ONT
- LHR
1 stop33h 45m
Alaska Airlines
Sun 8/235:00 pm
LHR
- ONT
1 stop26h 04m
Alaska Airlines
Deal found 6/2![Alaska Airlines logo]()
$1,036
This Alaska Airlines deal was found by Cheapflights users on 5/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/162:05 pm
ONT
- LHR
1 stop17h 00m
Alaska Airlines
Wed 8/195:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 5/31![Alaska Airlines logo]()
$1,145
This Alaska Airlines deal was found by Cheapflights users on 6/4. 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 7/65:26 pm
ONT
- LHR
1 stop13h 39m
Alaska Airlines
Thu 7/235:00 pm
LHR
- ONT
1 stop14h 11m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$1,146
This Alaska Airlines deal was found by Cheapflights users on 6/1. 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.
Wed 7/225:54 pm
ONT
- LHR
1 stop13h 11m
Alaska Airlines
Sat 8/15:00 pm
LHR
- ONT
1 stop14h 11m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$1,155
Last-minute flights from Ontario to HeathrowDiscover last-minute flight deals from Ontario to Heathrow. Data last updated June 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Heathrow. Data last updated June 4, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 5/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/205:26 pm
ONT
- LHR
1 stop13h 39m
Alaska Airlines
Mon 8/315:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 5/31![Alaska Airlines logo]()
$973
This Delta deal was found by Cheapflights users on 6/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/227:05 am
ONT
- LHR
1 stop22h 10m
Delta
Wed 8/196:30 am
LHR
- ONT
2 stops25h 04m
Delta
Deal found 6/4![Delta logo]()
$895
This Orbitz deal was found by Cheapflights users on 6/4. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/2212:35 pm
ONT
- LHR
1 stop16h 15m
British Airways
Wed 8/198:55 am
LHR
- ONT
1 stop17h 52m
British Airways
Deal found 6/4![British Airways logo]()
$924
This Vliegwinkel deal was found by Cheapflights users on 6/1. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/275:26 pm
ONT
- LHR
1 stop13h 39m
Alaska Airlines
Wed 8/125:00 pm
LHR
- ONT
1 stop14h 11m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$936
This United Airlines deal was found by Cheapflights users on 6/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/271:18 pm
ONT
- LHR
1 stop12h 22m
United Airlines
Wed 8/122:50 pm
LHR
- ONT
1 stop14h 03m
United Airlines
Deal found 6/2![United Airlines logo]()
$965
This United Airlines deal was found by Cheapflights users on 6/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/291:18 pm
ONT
- LHR
1 stop12h 22m
United Airlines
Wed 8/122:50 pm
LHR
- ONT
1 stop14h 03m
United Airlines
Deal found 6/1![United Airlines logo]()
$975
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 June 4, 2026.
Search for one-way flight options from Ontario to Heathrow. Find affordable one-way fares based on user searches. Data last updated June 4, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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 10/111:31 pm
ONT
- LHR
1 stop12h 59m
British Airways
Deal found 6/3![British Airways logo]()
$319
This Cheapflightsfares deal was found by Cheapflights users on 5/31. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/51:31 pm
ONT
- LHR
1 stop12h 59m
British Airways
Deal found 5/31![British Airways logo]()
$320
This Cheapflightsfares deal was found by Cheapflights users on 6/3. 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.
Wed 9/238:25 am
ONT
- LHR
1 stop13h 55m
British Airways
Deal found 6/3![British Airways logo]()
$321
This Booking.com deal was found by Cheapflights users on 6/3. 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 9/91:05 pm
ONT
- LHR
1 stop13h 25m
British Airways
Deal found 6/3![British Airways logo]()
$322
This oojo deal was found by Cheapflights users on 5/31. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:25 am
ONT
- LHR
1 stop16h 40m
British Airways
Deal found 5/31![British Airways logo]()
$324
This oojo deal was found by Cheapflights users on 6/3. 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.
Wed 9/3010:25 am
ONT
- LHR
1 stop14h 40m
British Airways
Deal found 6/3![British Airways logo]()
$325
This oojo deal was found by Cheapflights users on 6/3. 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.
Sun 10/46:00 am
ONT
- LHR
1 stop19h 00m
British Airways
Deal found 6/3![British Airways logo]()
$326
This Booking.com deal was found by Cheapflights users on 6/3. 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.
Mon 9/285:00 am
ONT
- LHR
2 stops21h 00m
Air Canada
Deal found 6/3![Air Canada logo]()
$328
This Alaska Airlines deal was found by Cheapflights users on 6/2. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/112:00 pm
ONT
- LHR
1 stop19h 05m
Alaska Airlines
Deal found 6/2![Alaska Airlines logo]()
$329
This Air Canada deal was found by Cheapflights users on 6/1. 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.
Tue 9/15:00 am
ONT
- LHR
2 stops17h 30m
Air Canada
Deal found 6/1![Air Canada logo]()
$330
This Trip.com deal was found by Cheapflights users on 6/3. 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.
Tue 7/216:00 am
ONT
- LHR
2 stops30h 20m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$332
This Trip.com deal was found by Cheapflights users on 6/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:00 am
ONT
- LHR
2 stops21h 55m
Multiple Airlines
Deal found 6/2![Multiple Airlines 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 June 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $826 (Expedia) |
One-way from | $319 (Cheapflightsfares) |
Popular in | June |
Cheapest in | November |
Average price | $1,592 |
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 June 4, 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 8/3
6:00 am-10:00 am
1 stop20h 00m
London Heathrow
Thu 8/20
6:30 am-9:52 pm
2 stops23h 22m
$866
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 8/5
12:04 pm-3:05 pm
1 stop19h 01m
London Heathrow
Fri 8/21
5:00 pm-11:24 pm
1 stop14h 24m
$923
Quickest round-trip
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Mon 7/27
1:18 pm-9:40 am
1 stop12h 22m
London Heathrow
Wed 8/12
2:50 pm-8:53 pm
1 stop14h 03m
$967
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Thu 11/19
6:00 am-8:45 am
2 stops18h 45m
London Heathrow
Sun 11/22
6:30 am-5:17 pm
2 stops18h 47m
$971
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Thu 8/6
2:05 pm-3:05 pm
1 stop17h 00m
London Heathrow
Fri 8/21
5:00 pm-11:24 pm
1 stop14h 24m
$973
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Mon 8/10
5:26 pm-3:05 pm
1 stop13h 39m
London Heathrow
Mon 8/24
5:00 pm-11:24 pm
1 stop14h 24m
$973
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 9/6
3:07 pm-3:05 pm
1 stop15h 58m
London Heathrow
Sun 9/20
5:00 pm-11:24 pm
1 stop14h 24m
$1,001
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 7/22
7:05 am-1:15 pm
1 stop22h 10m
London Heathrow
Wed 7/29
8:55 am-10:52 pm
2 stops21h 57m
$1,022
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sat 8/8
9:20 pm-3:05 pm
1 stop33h 45m
London Heathrow
Sun 8/23
5:00 pm-11:04 am
1 stop26h 04m
$1,036
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 8/16
2:05 pm-3:05 pm
1 stop17h 00m
London Heathrow
Wed 8/19
5:00 pm-11:24 pm
1 stop14h 24m
$1,145
Showing 1-10 of 22 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 June.
| 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?
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 June 4, 2026.
Read through reviews of airlines operating flights from Ontario to London Heathrow Airport, such as Delta,KLM, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.8
Food
7.2
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Entertainment
7.8
Food
7.2
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Entertainment
7.8
Food
7.2
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Entertainment
7.8
Food
7.2
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Entertainment
7.8
Food
7.2
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Entertainment
7.8
Food
7.2
Overall
7.9
Boarding
8.1
Crew
8.5
Comfort
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
Southend-on-Sea
Wembley
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Northampton
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
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Alternative routes
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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 June 4, 2026.
Ontario and Heathrow flights
Browse other Ontario and Heathrow flight options. Last updated on June 4, 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 June 4, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 5 airlines flying from Ontario to Heathrow
Discover the top 5 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 June 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$570 | Average$672 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$580 | Average$672 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$620 | Average$650 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$624 | Average$871 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$665 | Average$972 | FlexibilityNo cancel fee | On-time69% |