$319+ Cheap flights from Ontario (ONT) to London (LON)
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 — LON
Jul 4 — Jul 111
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to London with Cheapflights
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Cheapest flights from Ontario to LondonExplore the most affordable flight options available from Ontario to London. 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 London. 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
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.
Wed 9/237:05 am
ONT
- LGW
2 stops18h 20m
Delta
Mon 9/2810:25 am
LGW
- ONT
2 stops20h 15m
Delta
Deal found 6/3![Delta logo]()
$907
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:05 am
ONT
- LGW
2 stops18h 15m
Delta
Thu 9/1010:25 am
LGW
- ONT
2 stops20h 15m
Delta
Deal found 5/31![Delta logo]()
$928
Best flights from Ontario to LondonDiscover carefully curated flight deals from Ontario to London 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 London 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.
Wed 9/237:05 am
ONT
- LGW
2 stops18h 20m
Delta
Mon 9/2810:25 am
LGW
- ONT
2 stops20h 15m
Delta
Deal found 6/3![Delta logo]()
$907
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/312:00 pm
ONT
- LHR
1 stop17h 15m
KLM
Thu 8/2011:15 am
LHR
- ONT
1 stop18h 37m
KLM
Deal found 5/30![KLM logo]()
$923
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 Turkish 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/312:00 pm
ONT
- LGW
2 stops26h 35m
Multiple Airlines
Tue 11/106:30 am
LGW
- ONT
2 stops24h 24m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$1,251
This Ovago 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/110:22 am
ONT
- LCY
2 stops25h 33m
British Airways
Wed 7/87:15 pm
LCY
- ONT
2 stops36h 44m
British Airways
Deal found 6/3![British Airways logo]()
$1,323
This Turkish 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/259:10 pm
ONT
- LGW
2 stops35h 30m
Turkish Airlines
Mon 10/510:50 am
LGW
- ONT
2 stops65h 23m
Turkish Airlines
Deal found 6/3![Turkish Airlines logo]()
$1,436
This Icelandair 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/162:14 pm
ONT
- LGW
2 stops16h 26m
Icelandair
Sun 10/252:40 pm
LGW
- ONT
2 stops40h 02m
Icelandair
Deal found 5/30![Icelandair logo]()
$1,454
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 9/2012:12 pm
ONT
- LHR
1 stop18h 53m
Alaska Airlines
Sun 9/275:00 pm
LHR
- ONT
1 stop14h 24m
Alaska Airlines
Deal found 5/31![Alaska Airlines logo]()
$927
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/57:05 am
ONT
- LGW
2 stops18h 15m
Delta
Thu 9/1010:25 am
LGW
- ONT
2 stops20h 15m
Delta
Deal found 5/31![Delta logo]()
$928
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.
Fri 9/181:18 pm
ONT
- LHR
1 stop15h 07m
United Airlines
Sun 10/41:40 pm
LHR
- ONT
1 stop16h 18m
United Airlines
Deal found 6/1![United Airlines logo]()
$995
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.
Wed 11/117:00 am
ONT
- LGW
2 stops18h 00m
Delta
Tue 12/110:00 am
LGW
- ONT
2 stops20h 14m
Delta
Deal found 5/30![Delta logo]()
$998
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 Iberia 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/1810:22 am
ONT
- LCY
2 stops20h 53m
Iberia
Tue 6/239:35 am
LCY
- ONT
2 stops22h 24m
Iberia
Deal found 5/30![Iberia logo]()
$2,403
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.
Sat 7/181:18 pm
ONT
- LHR
1 stop12h 22m
United Airlines
Sat 7/251:40 pm
LHR
- ONT
1 stop16h 15m
United Airlines
Deal found 6/3![United Airlines logo]()
$1,164
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1912:00 pm
ONT
- LHR
1 stop16h 20m
Alaska Airlines
Sun 11/292:45 pm
LHR
- ONT
1 stop28h 24m
Alaska Airlines
Deal found 5/30![Alaska Airlines logo]()
$1,078
This Icelandair 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/251:50 pm
ONT
- LGW
2 stops16h 50m
Multiple Airlines
Mon 9/73:40 pm
LGW
- ONT
2 stops35h 23m
Multiple Airlines
Deal found 6/1![Multiple Airlines logo]()
$1,367
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/612:04 pm
ONT
- LHR
1 stop19h 01m
Alaska Airlines
Fri 7/175:00 pm
LHR
- ONT
1 stop14h 11m
Alaska Airlines
Deal found 5/30![Alaska Airlines logo]()
$1,095
This Turkish 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:24 pm
ONT
- LGW
2 stops53h 46m
Multiple Airlines
Thu 8/277:30 am
LGW
- ONT
2 stops23h 54m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$1,376
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/197:05 am
ONT
- LGW
2 stops18h 20m
Delta
Wed 7/2910:25 am
LGW
- ONT
2 stops20h 27m
Delta
Deal found 5/31![Delta logo]()
$1,257
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 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.
Fri 9/256:20 am
ONT
- LCY
2 stops19h 10m
Delta
Mon 10/58:25 am
LCY
- ONT
2 stops22h 15m
Delta
Deal found 6/3![Delta logo]()
$1,309
This Turkish Airlines 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1311:50 pm
ONT
- LGW
2 stops53h 20m
Multiple Airlines
Mon 8/177:05 am
LGW
- ONT
2 stops24h 06m
Multiple Airlines
Deal found 5/30![Multiple Airlines logo]()
$1,525
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
This Turkish Airlines 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/292:05 pm
ONT
- LGW
2 stops24h 25m
Multiple Airlines
Sat 8/87:10 am
LGW
- ONT
2 stops24h 01m
Multiple Airlines
Deal found 5/30![Multiple Airlines logo]()
$1,585
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.
Sun 7/197:05 am
ONT
- LGW
2 stops18h 20m
Delta
Sun 8/210:25 am
LGW
- ONT
2 stops19h 25m
Delta
Deal found 5/30![Delta logo]()
$1,469
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/195:10 pm
ONT
- LCY
2 stops16h 10m
KLM
Tue 8/47:45 am
LCY
- ONT
2 stops16h 39m
KLM
Deal found 5/31![KLM logo]()
$4,981
This KLM 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/195:10 pm
ONT
- LCY
2 stops16h 10m
KLM
Mon 8/37:45 am
LCY
- ONT
2 stops16h 39m
KLM
Deal found 5/31![KLM logo]()
$4,986
Last-minute flights from Ontario to LondonDiscover last-minute flight deals from Ontario to London. Data last updated June 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to London. Data last updated June 4, 2026 and is based on user searches.
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/89:36 pm
ONT
- LGW
2 stops25h 29m
Multiple Airlines
Thu 6/119:40 am
LGW
- ONT
2 stops21h 25m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$1,058
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/812:55 am
ONT
- LGW
2 stops22h 10m
Multiple Airlines
Thu 6/189:40 am
LGW
- ONT
2 stops21h 25m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$1,088
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/119:36 pm
ONT
- LGW
2 stops26h 14m
Multiple Airlines
Thu 6/189:40 am
LGW
- ONT
2 stops21h 25m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$1,091
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/55:34 am
ONT
- LCY
2 stops28h 51m
British Airways
Sun 7/197:00 pm
LCY
- ONT
2 stops32h 59m
British Airways
Deal found 5/31![British Airways logo]()
$1,281
This flugladen.de 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/145:26 pm
ONT
- LHR
1 stop13h 39m
Alaska Airlines
Thu 8/135:00 pm
LHR
- ONT
1 stop14h 11m
Alaska Airlines
Deal found 6/1![Alaska Airlines logo]()
$998
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/197:05 am
ONT
- LGW
2 stops18h 20m
Delta
Wed 7/2910:25 am
LGW
- ONT
2 stops20h 27m
Delta
Deal found 6/2![Delta logo]()
$1,128
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 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 Kissandfly.com 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 Kissandfly.com 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
Lufthansa
Wed 8/122:50 pm
LHR
- ONT
1 stop14h 03m
Lufthansa
Deal found 6/1![Lufthansa logo]()
$985
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
This Icelandair 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/292:05 pm
ONT
- LGW
2 stops16h 35m
Multiple Airlines
Wed 8/123:40 pm
LGW
- ONT
2 stops33h 12m
Multiple Airlines
Deal found 6/1![Multiple Airlines logo]()
$1,276
One-way flights from Ontario to LondonSearch for one-way flight options from Ontario to London. Find affordable one-way fares based on user searches. Data last updated June 4, 2026.
Search for one-way flight options from Ontario to London. 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 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.
Sun 11/16:02 am
ONT
- LHR
1 stop17h 28m
United Airlines
Deal found 6/2![United 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 6/3. 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.
Wed 8/2610:50 am
ONT
- LGW
2 stops19h 50m
Multiple Airlines
Deal found 6/3![Multiple Airlines logo]()
$332
Find flight deals from Ontario to London
Discover tips and strategies to find the most affordable flight options for your journey from Ontario (ONT) to London (LON). 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 | March |
Average price | $1,433 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to London 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 that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Wed 9/23
7:05 am-9:25 am
2 stops18h 20m
London Gatwick
Mon 9/28
10:25 am-10:40 pm
2 stops20h 15m
$907
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Mon 8/3
12:00 pm-1:15 pm
1 stop17h 15m
London Heathrow
Thu 8/20
11:15 am-9:52 pm
1 stop18h 37m
$923
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
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Sun 9/20
12:12 pm-3:05 pm
1 stop18h 53m
London Heathrow
Sun 9/27
5:00 pm-11:24 pm
1 stop14h 24m
$927
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Sat 9/5
7:05 am-9:20 am
2 stops18h 15m
London Gatwick
Thu 9/10
10:25 am-10:40 pm
2 stops20h 15m
$928
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
Fri 9/18
1:18 pm-12:25 pm
1 stop15h 07m
London Heathrow
Sun 10/4
1:40 pm-9:58 pm
1 stop16h 18m
$995
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Wed 11/11
7:00 am-9:00 am
2 stops18h 00m
London Gatwick
Tue 12/1
10:00 am-10:14 pm
2 stops20h 14m
$998
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
Thu 11/19
12:00 pm-12:20 pm
1 stop16h 20m
London Heathrow
Sun 11/29
2:45 pm-11:09 am
1 stop28h 24m
$1,078
Showing 1-10 of 58 resultsSorted by cheapest first
Compare providers for flights from Ontario to London
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 London in June.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 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 flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Ontario-London flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Ontario-London flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Ontario-London 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 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 London
Have a flexible travel schedule? Discover the best time to fly to London from Ontario with our price prediction graph.
ONT-LON
ONT-LGW
ONT-LHR
ONT-LCY
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
ONT-LON
ONT-LGW
ONT-LHR
ONT-LCY
What is the cheapest month to book a flight from Ontario to London?
Currently, September is the cheapest month in which you can book a flight from Ontario to London (average of $251). Flying from Ontario to London in June is currently the most expensive (average of $1,105). 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?
Reviews of airlines servicing London
Get insights into the airlines that provide service to London. 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 London. Reviews last updated June 4, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andBritish Airways from Ontario to London by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Food
7.2
Overall
7.9
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Entertainment
7.8
Comfort
7.8
Boarding
8.1
Food
7.2
Overall
7.9
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 London. 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?
Book flights to London if you plan to visit one of these locationsIlford
Dorking
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
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
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Other flights from Ontario
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Alternative routes for Ontario to London
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Complete your trip
Complete your trip to London by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to London by cabin class
Find flights from Ontario to London, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to London
Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 4, 2026.
Ontario and London flights
Browse other Ontario and London 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 London
Discover the top 5 airlines that operate flights from Ontario to London. 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% |