$434+ 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 5/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LON
May 15 — May 221
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 April 15, 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 April 15, 2026.
This lol.travel deal was found by Cheapflights users on 4/14. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/310:54 am
ONT
- LHR
1 stop13h 11m
British Airways
Tue 5/1910:05 am
LHR
- ONT
1 stop14h 17m
British Airways
Deal found 4/14![British Airways logo]()
$885
This Virgin Atlantic deal was found by Cheapflights users on 4/11. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/265:55 pm
ONT
- LHR
1 stop13h 40m
Virgin Atlantic
Tue 5/1211:45 am
LHR
- ONT
2 stops18h 49m
Virgin Atlantic
Deal found 4/11![Virgin Atlantic logo]()
$888
This KLM deal was found by Cheapflights users on 4/13. 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 8/232:00 pm
ONT
- LHR
1 stop17h 35m
KLM
Tue 9/86:30 am
LHR
- ONT
2 stops17h 44m
KLM
Deal found 4/13![KLM logo]()
$894
This Delta deal was found by Cheapflights users on 4/10. 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.
Tue 10/611:55 am
ONT
- LHR
1 stop19h 40m
Delta
Wed 10/146:30 am
LHR
- ONT
2 stops25h 18m
Delta
Deal found 4/10![Delta logo]()
$895
This lol.travel deal was found by Cheapflights users on 4/13. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2710:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Tue 5/1210:05 am
LHR
- ONT
1 stop14h 17m
British Airways
Deal found 4/13![British Airways logo]()
$897
This Virgin Atlantic deal was found by Cheapflights users on 4/13. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/67:00 am
ONT
- LHR
2 stops16h 10m
Virgin Atlantic
Tue 10/2011:45 am
LHR
- ONT
2 stops18h 58m
Virgin Atlantic
Deal found 4/13![Virgin Atlantic logo]()
$899
This Delta deal was found by Cheapflights users on 4/13. 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 8/237:00 am
ONT
- LHR
2 stops16h 55m
Delta
Tue 9/811:45 am
LHR
- ONT
2 stops18h 55m
Delta
Deal found 4/13![Delta logo]()
$900
This Expedia deal was found by Cheapflights users on 4/10. 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 4/282:08 pm
ONT
- LHR
1 stop16h 17m
Iberia
Tue 5/198:00 pm
LHR
- ONT
2 stops35h 46m
Iberia
Deal found 4/10![Iberia logo]()
$901
This Mytrip deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:00 am
ONT
- LHR
2 stops24h 20m
Air Canada
Tue 5/199:30 am
LHR
- ONT
2 stops43h 06m
Air Canada
Deal found 4/10![Air Canada logo]()
$903
This Air Canada deal was found by Cheapflights users on 4/14. 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 9/205:00 am
ONT
- LHR
2 stops17h 30m
Air Canada
Thu 10/110:15 am
LHR
- ONT
2 stops39h 03m
Air Canada
Deal found 4/14![Air Canada logo]()
$904
This Delta deal was found by Cheapflights users on 4/12. 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.
Tue 5/52:20 pm
ONT
- LGW
2 stops17h 40m
Delta
Tue 5/1210:35 am
LGW
- ONT
2 stops19h 59m
Delta
Deal found 4/12![Delta logo]()
$906
This Air France deal was found by Cheapflights users on 4/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/69:55 am
ONT
- LGW
2 stops22h 05m
Air France
Tue 10/135:00 pm
LGW
- ONT
2 stops31h 12m
Air France
Deal found 4/13![Air France logo]()
$919
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 April 15, 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 April 15, 2026.
This United Airlines deal was found by Cheapflights users on 4/10. 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 4/261:34 pm
ONT
- LHR
1 stop15h 01m
United Airlines
Tue 5/122:50 pm
LHR
- ONT
1 stop13h 46m
United Airlines
Deal found 4/10![United Airlines logo]()
$915
This KLM deal was found by Cheapflights users on 4/12. 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.
Wed 5/131:29 pm
ONT
- LHR
1 stop12h 31m
KLM
Wed 5/2010:55 am
LHR
- ONT
1 stop13h 22m
KLM
Deal found 4/12![KLM logo]()
$917
This Delta deal was found by Cheapflights users on 4/10. 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 5/12:20 pm
ONT
- LGW
2 stops17h 40m
Delta
Mon 5/1110:25 am
LGW
- ONT
2 stops20h 09m
Delta
Deal found 4/10![Delta logo]()
$1,003
This Turkish Airlines deal was found by Cheapflights users on 4/10. 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 5/66:00 am
ONT
- LGW
2 stops32h 30m
Multiple Airlines
Wed 5/137:05 am
LGW
- ONT
2 stops24h 53m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,099
This JetBlue deal was found by Cheapflights users on 4/13. 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 5/1811:25 pm
ONT
- LHR
1 stop13h 20m
JetBlue
Mon 6/18:15 am
LHR
- ONT
1 stop20h 32m
JetBlue
Deal found 4/13![JetBlue logo]()
$1,343
This Iberia deal was found by Cheapflights users on 4/12. 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.
Mon 4/2710:59 am
ONT
- LCY
2 stops20h 16m
Iberia
Mon 5/119:35 am
LCY
- ONT
2 stops22h 11m
Iberia
Deal found 4/12![Iberia logo]()
$1,470
This Turkish Airlines deal was found by Cheapflights users on 4/12. 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 4/236:00 am
ONT
- LGW
2 stops32h 25m
Multiple Airlines
Mon 5/47:05 am
LGW
- ONT
2 stops24h 54m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$1,099
This United Airlines deal was found by Cheapflights users on 4/13. 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.
Tue 5/191:30 pm
ONT
- LHR
1 stop13h 40m
United Airlines
Sun 5/311:40 pm
LHR
- ONT
1 stop16h 15m
United Airlines
Deal found 4/13![United Airlines logo]()
$1,255
This Delta deal was found by Cheapflights users on 4/10. 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 4/237:00 am
ONT
- LCY
2 stops18h 30m
Delta
Mon 5/410:00 am
LCY
- ONT
2 stops20h 37m
Delta
Deal found 4/10![Delta logo]()
$1,301
This Turkish Airlines deal was found by Cheapflights users on 4/12. 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 5/110:39 am
ONT
- LGW
2 stops27h 46m
Multiple Airlines
Mon 5/117:05 am
LGW
- ONT
2 stops24h 54m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$1,188
This KLM deal was found by Cheapflights users on 4/10. 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.
Fri 4/171:29 pm
ONT
- LHR
1 stop12h 31m
KLM
Mon 4/2711:15 am
LHR
- ONT
1 stop15h 18m
KLM
Deal found 4/10![KLM logo]()
$1,329
This United Airlines deal was found by Cheapflights users on 4/9. 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 4/176:05 am
ONT
- LHR
1 stop17h 50m
United Airlines
Sat 5/1611:25 am
LHR
- ONT
1 stop17h 11m
United Airlines
Deal found 4/9![United Airlines logo]()
$1,291
This Delta deal was found by Cheapflights users on 4/9. 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 5/316:45 am
ONT
- LHR
1 stop21h 25m
Delta
Tue 6/96:30 am
LHR
- ONT
2 stops18h 12m
Delta
Deal found 4/9![Delta logo]()
$1,324
This Icelandair deal was found by Cheapflights users on 4/13. 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 4/2810:39 am
ONT
- LGW
2 stops20h 01m
Multiple Airlines
Mon 5/43:40 pm
LGW
- ONT
2 stops38h 10m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$1,263
This United Airlines deal was found by Cheapflights users on 4/13. 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.
Thu 5/141:30 pm
ONT
- LHR
1 stop13h 40m
United Airlines
Mon 5/252:50 pm
LHR
- ONT
1 stop13h 52m
United Airlines
Deal found 4/13![United Airlines logo]()
$1,307
This Iberia deal was found by Cheapflights users on 4/11. 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 5/1310:59 am
ONT
- LCY
2 stops20h 16m
Iberia
Tue 5/269:35 am
LCY
- ONT
2 stops22h 24m
Iberia
Deal found 4/11![Iberia logo]()
$1,618
This Icelandair deal was found by Cheapflights users on 4/14. 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 5/1912:04 pm
ONT
- LGW
2 stops18h 36m
Multiple Airlines
Tue 9/223:40 pm
LGW
- ONT
2 stops38h 20m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$1,270
This United Airlines deal was found by Cheapflights users on 4/9. 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.
Thu 6/41:18 pm
ONT
- LHR
1 stop12h 22m
United Airlines
Tue 6/92:50 pm
LHR
- ONT
1 stop13h 52m
United Airlines
Deal found 4/9![United Airlines logo]()
$1,324
This Iberia deal was found by Cheapflights users on 4/13. 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.
Tue 4/2810:59 am
ONT
- LCY
2 stops20h 16m
Iberia
Mon 5/49:35 am
LCY
- ONT
2 stops22h 11m
Iberia
Deal found 4/13![Iberia logo]()
$1,678
This Icelandair deal was found by Cheapflights users on 4/10. 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 4/2810:39 am
ONT
- LGW
2 stops20h 01m
Multiple Airlines
Sat 5/93:40 pm
LGW
- ONT
2 stops38h 55m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,278
This Icelandair deal was found by Cheapflights users on 4/13. 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.
Mon 4/2710:39 am
ONT
- LGW
2 stops17h 06m
Multiple Airlines
Tue 5/121:00 pm
LGW
- ONT
2 stops16h 50m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$1,284
This Iberia deal was found by Cheapflights users on 4/13. 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.
Sun 5/2412:40 pm
ONT
- LCY
2 stops60h 20m
Iberia
Mon 6/19:35 am
LCY
- ONT
2 stops42h 21m
Iberia
Deal found 4/13![Iberia logo]()
$1,781
This Icelandair deal was found by Cheapflights users on 4/13. 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.
Mon 4/2710:39 am
ONT
- LHR
2 stops17h 16m
Multiple Airlines
Tue 5/121:05 pm
LHR
- ONT
2 stops16h 45m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$1,285
This Iberia deal was found by Cheapflights users on 4/13. 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.
Sun 5/242:18 pm
ONT
- LCY
2 stops58h 42m
Iberia
Thu 6/49:35 am
LCY
- ONT
2 stops42h 21m
Iberia
Deal found 4/13![Iberia logo]()
$1,781
This Icelandair deal was found by Cheapflights users on 4/10. 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.
Sat 4/1810:33 am
ONT
- LHR
2 stops17h 22m
Multiple Airlines
Sat 4/251:05 pm
LHR
- ONT
2 stops17h 27m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,337
This Iberia deal was found by Cheapflights users on 4/10. 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 6/2410:22 am
ONT
- LCY
2 stops20h 53m
Iberia
Thu 7/29:35 am
LCY
- ONT
2 stops22h 24m
Iberia
Deal found 4/10![Iberia logo]()
$1,946
This Iberia deal was found by Cheapflights users on 4/13. 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 5/1410:59 am
ONT
- LCY
2 stops20h 16m
Iberia
Tue 5/269:35 am
LCY
- ONT
2 stops22h 24m
Iberia
Deal found 4/13![Iberia logo]()
$1,983
Last-minute flights from Ontario to LondonDiscover last-minute flight deals from Ontario to London. Data last updated April 15, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to London. Data last updated April 15, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 4/10. 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 4/237:00 am
ONT
- LGW
2 stops18h 25m
Delta
Mon 5/410:25 am
LGW
- ONT
2 stops20h 12m
Delta
Deal found 4/10![Delta logo]()
$1,003
This Virgin Atlantic deal was found by Cheapflights users on 4/11. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/265:55 pm
ONT
- LHR
1 stop13h 40m
Virgin Atlantic
Tue 5/1211:45 am
LHR
- ONT
2 stops18h 49m
Virgin Atlantic
Deal found 4/11![Virgin Atlantic logo]()
$888
This lol.travel deal was found by Cheapflights users on 4/13. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/2710:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Tue 5/1210:05 am
LHR
- ONT
1 stop14h 17m
British Airways
Deal found 4/13![British Airways logo]()
$897
This Expedia deal was found by Cheapflights users on 4/10. 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 4/282:08 pm
ONT
- LHR
1 stop16h 17m
Iberia
Tue 5/198:00 pm
LHR
- ONT
2 stops35h 46m
Iberia
Deal found 4/10![Iberia logo]()
$901
This lol.travel deal was found by Cheapflights users on 4/14. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/310:54 am
ONT
- LHR
1 stop13h 11m
British Airways
Tue 5/1910:05 am
LHR
- ONT
1 stop14h 17m
British Airways
Deal found 4/14![British Airways logo]()
$885
This Delta deal was found by Cheapflights users on 4/12. 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.
Tue 5/57:00 am
ONT
- LHR
1 stop21h 10m
Delta
Tue 5/129:55 am
LHR
- ONT
2 stops19h 53m
Delta
Deal found 4/12![Delta logo]()
$894
This Delta deal was found by Cheapflights users on 4/12. 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.
Tue 5/52:20 pm
ONT
- LGW
2 stops17h 40m
Delta
Tue 5/1210:35 am
LGW
- ONT
2 stops19h 59m
Delta
Deal found 4/12![Delta logo]()
$906
This Cheapflightsfares deal was found by Cheapflights users on 4/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Fri 5/154:10 pm
LHR
- ONT
1 stop13h 49m
British Airways
Deal found 4/9![British Airways logo]()
$907
This Virgin Atlantic deal was found by Cheapflights users on 4/10. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/62:20 pm
ONT
- LHR
1 stop17h 15m
Virgin Atlantic
Wed 5/139:55 am
LHR
- ONT
2 stops21h 39m
Virgin Atlantic
Deal found 4/10![Virgin Atlantic logo]()
$895
This Delta deal was found by Cheapflights users on 4/12. 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 5/61:29 pm
ONT
- LHR
2 stops15h 46m
Delta
Wed 5/138:40 am
LHR
- ONT
2 stops21h 54m
Delta
Deal found 4/12![Delta logo]()
$899
This Mytrip deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/125:00 am
ONT
- LHR
2 stops24h 20m
Air Canada
Tue 5/199:30 am
LHR
- ONT
2 stops43h 06m
Air Canada
Deal found 4/10![Air Canada logo]()
$903
This Trip.com deal was found by Cheapflights users on 4/14. 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 5/125:50 pm
ONT
- LHR
1 stop13h 45m
Virgin Atlantic
Tue 5/1910:55 am
LHR
- ONT
1 stop13h 22m
Virgin Atlantic
Deal found 4/14![Virgin Atlantic logo]()
$908
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 April 15, 2026.
Search for one-way flight options from Ontario to London. Find affordable one-way fares based on user searches. Data last updated April 15, 2026.
This JetBlue deal was found by Cheapflights users on 4/13. 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 5/1811:25 pm
ONT
- LHR
1 stop13h 20m
JetBlue
Deal found 4/13![JetBlue logo]()
$434
This Trip.com deal was found by Cheapflights users on 4/14. 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 5/176:00 am
ONT
- LHR
3 stops23h 15m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$447
This Kiwi.com deal was found by Cheapflights users on 4/11. 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.
Mon 6/111:51 am
ONT
- LGW
3 stops49h 24m
Multiple Airlines
Deal found 4/11![Multiple Airlines logo]()
$447
This Cheapflightsfares deal was found by Cheapflights users on 4/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1210:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Deal found 4/10![British Airways logo]()
$498
This Cheapflightsfares deal was found by Cheapflights users on 4/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/510:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Deal found 4/14![British Airways logo]()
$500
This Cheapflightsfares deal was found by Cheapflights users on 4/13. 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 4/2910:59 am
ONT
- LHR
1 stop12h 56m
British Airways
Deal found 4/13![British Airways logo]()
$501
This Flightnetwork deal was found by Cheapflights users on 4/13. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/410:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Deal found 4/13![British Airways logo]()
$503
This Cheapflightsfares deal was found by Cheapflights users on 4/9. 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 4/2710:59 am
ONT
- LHR
1 stop13h 06m
British Airways
Deal found 4/9![British Airways logo]()
$504
This Kiwi.com deal was found by Cheapflights users on 4/10. 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.
Wed 4/2211:44 am
ONT
- LGW
3 stops51h 26m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$505
This Trip.com deal was found by Cheapflights users on 4/14. 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 5/101:35 pm
ONT
- LHR
1 stop14h 35m
Virgin Atlantic
Deal found 4/14![Virgin Atlantic logo]()
$507
This JetBlue deal was found by Cheapflights users on 4/12. 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 5/2011:39 pm
ONT
- LHR
1 stop13h 06m
JetBlue
Deal found 4/12![JetBlue logo]()
$508
This Trip.com deal was found by Cheapflights users on 4/13. 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 5/311:53 am
ONT
- LHR
1 stop19h 42m
Virgin Atlantic
Deal found 4/13![Virgin Atlantic logo]()
$509
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 April 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $885 (lol.travel) |
One-way from | $434 (JetBlue) |
Popular in | June |
Cheapest in | March |
Average price | $886 |
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 April 15, 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 - LHR
ONTLHR
Ontario
Sun 4/26
1:34 pm-12:35 pm
1 stop15h 01m
London Heathrow
Tue 5/12
2:50 pm-8:36 pm
1 stop13h 46m
$915
Quickest round-trip
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Wed 5/13
1:29 pm-10:00 am
1 stop12h 31m
London Heathrow
Wed 5/20
10:55 am-4:17 pm
1 stop13h 22m
$917
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Fri 5/1
2:20 pm-4:00 pm
2 stops17h 40m
London Gatwick
Mon 5/11
10:25 am-10:34 pm
2 stops20h 09m
$1,003
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Wed 5/6
6:00 am-10:30 pm
2 stops32h 30m
London Gatwick
Wed 5/13
7:05 am-11:58 pm
2 stops24h 53m
$1,099
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Thu 4/23
6:00 am-10:25 pm
2 stops32h 25m
London Gatwick
Mon 5/4
7:05 am-11:59 pm
2 stops24h 54m
$1,099
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Fri 5/1
10:39 am-10:25 pm
2 stops27h 46m
London Gatwick
Mon 5/11
7:05 am-11:59 pm
2 stops24h 54m
$1,188
OntarioLondon
ONT - LHR
ONTLHR
Ontario
Tue 5/19
1:30 pm-11:10 am
1 stop13h 40m
London Heathrow
Sun 5/31
1:40 pm-9:55 pm
1 stop16h 15m
$1,255
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Tue 4/28
10:39 am-2:40 pm
2 stops20h 01m
London Gatwick
Mon 5/4
3:40 pm-9:50 pm
2 stops38h 10m
$1,263
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Tue 5/19
12:04 pm-2:40 pm
2 stops18h 36m
London Gatwick
Tue 9/22
3:40 pm-10:00 pm
2 stops38h 20m
$1,270
OntarioLondon
ONT - LGW
ONTLGW
Ontario
Tue 4/28
10:39 am-2:40 pm
2 stops20h 01m
London Gatwick
Sat 5/9
3:40 pm-10:35 pm
2 stops38h 55m
$1,278
Showing 1-10 of 57 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 April.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*3 stars | |
| Price Accuracy2 stars | Trust Score*2 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-LHR
ONT-LGW
ONT-SEN
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-LHR
ONT-LGW
ONT-SEN
ONT-LCY
What is the cheapest month to book a flight from Ontario to London?
Currently, October is the cheapest month in which you can book a flight from Ontario to London (average of $217). Flying from Ontario to London in June is currently the most expensive (average of $572). 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 April 15, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andAmerican Airlines 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.
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Boarding
8.1
Comfort
7.9
Crew
8.5
Entertainment
7.8
Overall
7.9
Food
7.2
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
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Borehamwood
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Sutton
Stansted
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.
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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 April 15, 2026.
Ontario and London flights
Browse other Ontario and London flight options. Last updated on April 15, 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 April 15, 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 April 15, 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$624 | Average$687 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$624 | Average$872 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$662 | Average$941 | FlexibilityNo cancel fee | On-time69% |