$313+ Cheap flights from Ontario (ONT) to London (LON)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/9. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LON
Oct 12 — Oct 191
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to London 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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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 September 12, 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 September 12, 2026.
This oojo deal was found by Cheapflights users on 9/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:13 am -
1 stop19h 52m
Tue 10/205:00 pm -
1 stop28h 16m
Deal found 9/12![Alaska Airlines logo]()
$732
This oojo deal was found by Cheapflights users on 9/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/52:13 pm -
1 stop16h 52m
Tue 10/135:00 pm -
1 stop28h 16m
Deal found 9/9![Alaska Airlines logo]()
$733
This flugladen.de deal was found by Cheapflights users on 9/11. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/46:02 am -
1 stop25h 03m
Tue 10/205:00 pm -
1 stop33h 00m
Deal found 9/11![Alaska Airlines logo]()
$735
This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2012:19 pm -
1 stop15h 01m
Tue 10/611:40 am -
1 stop19h 03m
Deal found 9/9![Virgin Atlantic logo]()
$736
This Booking.com deal was found by Cheapflights users on 9/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:13 am -
1 stop18h 07m
Tue 11/32:45 pm -
1 stop28h 33m
Deal found 9/9![Alaska Airlines logo]()
$737
This Booking.com deal was found by Cheapflights users on 9/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/74:09 pm -
1 stop36h 11m
Tue 11/102:45 pm -
1 stop28h 33m
Deal found 9/11![Alaska Airlines logo]()
$738
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:20 am -
1 stop21h 20m
Tue 11/36:20 am -
2 stops24h 23m
Deal found 9/11![Delta logo]()
$739
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/47:07 am -
2 stops16h 13m
Wed 11/116:30 am -
2 stops18h 49m
Deal found 9/11![Delta logo]()
$744
This Gotogate deal was found by Cheapflights users on 9/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/256:02 am -
1 stop23h 18m
Tue 11/102:45 pm -
1 stop35h 32m
Deal found 9/11![Alaska Airlines logo]()
$745
This Delta deal was found by Cheapflights users on 9/8. 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 10/611:56 am -
1 stop15h 24m
Wed 10/2111:40 am -
1 stop19h 03m
Deal found 9/8![Delta logo]()
$746
This Delta deal was found by Cheapflights users on 9/8. 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 10/47:05 am -
1 stop15h 20m
Fri 10/167:50 pm -
2 stops23h 16m
Deal found 9/8![Delta logo]()
$750
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:07 am -
2 stops18h 18m
Tue 10/2010:35 am -
2 stops20h 08m
Deal found 9/11![Delta logo]()
$758
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 September 12, 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 September 12, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/9. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/2711:36 am -
1 stop16h 44m
Tue 2/92:45 pm -
1 stop15h 56m
Deal found 9/9![Alaska Airlines logo]()
$746
This KLM deal was found by Cheapflights users on 9/9. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/237:05 am -
2 stops16h 10m
Wed 12/29:20 am -
2 stops19h 39m
Deal found 9/9![KLM logo]()
$820
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/127:00 am -
1 stop19h 40m
Mon 11/166:30 am -
2 stops24h 30m
Deal found 9/11![Delta logo]()
$839
This United Airlines deal was found by Cheapflights users on 9/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/251:24 pm -
1 stop12h 16m
Sun 9/271:40 pm -
1 stop16h 19m
Deal found 9/11![United Airlines logo]()
$896
This British Airways deal was found by Cheapflights users on 9/11. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/124:25 pm -
1 stop13h 10m
Mon 11/161:50 pm -
1 stop15h 42m
Deal found 9/11![British Airways logo]()
$985
This Finnair deal was found by Cheapflights users on 9/7. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/281:25 pm -
1 stop16h 10m
Wed 1/62:35 pm -
1 stop15h 24m
Deal found 9/7![Multiple Airlines logo]()
$1,059
This Iberia deal was found by Cheapflights users on 9/8. 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 10/610:25 am -
2 stops20h 50m
Wed 10/217:15 pm -
2 stops36h 37m
Deal found 9/8![Iberia logo]()
$1,180
This JetBlue deal was found by Cheapflights users on 9/8. 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.
Fri 10/210:39 pm -
1 stop14h 06m
Sat 10/1711:55 am -
1 stop17h 50m
Deal found 9/8![JetBlue logo]()
$1,214
This Delta deal was found by Cheapflights users on 9/10. 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.
Wed 9/231:04 pm -
2 stops19h 36m
Mon 9/289:20 am -
2 stops21h 20m
Deal found 9/10![Delta logo]()
$840
This Turkish Airlines deal was found by Cheapflights users on 9/12. 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.
Sun 9/2010:39 pm -
2 stops34h 01m
Tue 10/65:35 pm -
2 stops35h 24m
Deal found 9/12![Turkish Airlines logo]()
$1,684
This Alaska Airlines deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:00 am -
1 stop22h 20m
Fri 11/132:45 pm -
1 stop16h 21m
Deal found 9/8![Alaska Airlines logo]()
$936
This KLM deal was found by Cheapflights users on 9/8. 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 10/911:56 am -
1 stop19h 39m
Mon 10/196:30 am -
2 stops18h 42m
Deal found 9/8![KLM logo]()
$1,007
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/911:57 am -
1 stop14h 43m
Wed 12/3010:50 am -
1 stop17h 41m
Deal found 9/11![Delta logo]()
$938
This Icelandair deal was found by Cheapflights users on 9/11. 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 Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:15 am -
2 stops19h 40m
Wed 11/1111:55 am -
2 stops17h 50m
Deal found 9/11![Multiple Airlines logo]()
$1,137
This British Airways deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:25 am -
2 stops20h 50m
Tue 10/207:15 pm -
2 stops31h 29m
Deal found 9/8![British Airways logo]()
$1,160
This Iberia deal was found by Cheapflights users on 9/9. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/910:30 am -
2 stops19h 30m
Tue 12/157:15 pm -
2 stops36h 31m
Deal found 9/9![Iberia logo]()
$1,195
This Delta deal was found by Cheapflights users on 9/7. 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 10/129:45 am -
2 stops17h 35m
Sun 10/186:30 pm -
1 stop24h 46m
Deal found 9/7![Delta logo]()
$990
This Alaska Airlines deal was found by Cheapflights users on 9/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1012:00 pm -
1 stop16h 20m
Tue 12/292:45 pm -
1 stop17h 11m
Deal found 9/11![Alaska Airlines logo]()
$1,101
This KLM deal was found by Cheapflights users on 9/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/57:07 am -
2 stops16h 08m
Thu 11/127:45 am -
2 stops18h 49m
Deal found 9/11![KLM logo]()
$1,119
This British Airways deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/610:25 am -
2 stops20h 50m
Wed 10/217:15 pm -
2 stops36h 37m
Deal found 9/8![British Airways logo]()
$1,160
This Condor deal was found by Cheapflights users on 9/8. 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 Condor is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/65:40 am -
2 stops29h 10m
Sun 10/1810:20 am -
2 stops21h 25m
Deal found 9/8![Multiple Airlines logo]()
$1,162
This Iberia deal was found by Cheapflights users on 9/9. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/710:30 am -
2 stops43h 30m
Tue 12/157:15 pm -
2 stops36h 31m
Deal found 9/9![Iberia logo]()
$1,201
This Turkish Airlines deal was found by Cheapflights users on 9/9. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/510:42 pm -
2 stops27h 13m
Tue 10/137:00 am -
2 stops22h 45m
Deal found 9/9![Multiple Airlines logo]()
$1,182
This Delta deal was found by Cheapflights users on 9/12. 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 9/291:04 pm -
2 stops19h 36m
Tue 10/610:00 am -
2 stops20h 43m
Deal found 9/12![Delta logo]()
$1,110
This British Airways deal was found by Cheapflights users on 9/10. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2212:41 pm -
1 stop13h 19m
Tue 12/292:35 pm -
1 stop15h 22m
Deal found 9/10![British Airways logo]()
$1,241
This Iberia deal was found by Cheapflights users on 9/9. 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 Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/710:30 am -
2 stops43h 30m
Wed 12/167:40 am -
2 stops24h 06m
Deal found 9/9![Iberia logo]()
$1,260
This Turkish Airlines deal was found by Cheapflights users on 9/7. 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 11/712:02 pm -
2 stops26h 33m
Tue 11/106:30 am -
2 stops36h 48m
Deal found 9/7![Multiple Airlines logo]()
$1,212
This Icelandair deal was found by Cheapflights users on 9/8. 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.
Thu 12/310:05 am -
2 stops16h 50m
Fri 12/1811:55 am -
2 stops18h 30m
Deal found 9/8![Multiple Airlines logo]()
$1,216
This Icelandair deal was found by Cheapflights users on 9/7. 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 10/192:13 pm -
2 stops16h 27m
Mon 11/211:55 am -
2 stops18h 45m
Deal found 9/7![Multiple Airlines logo]()
$1,236
This Turkish Airlines deal was found by Cheapflights users on 9/11. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/262:13 pm -
2 stops25h 22m
Tue 11/36:30 am -
2 stops43h 47m
Deal found 9/11![Multiple Airlines logo]()
$1,313
Last-minute flights from Ontario to LondonDiscover last-minute flight deals from Ontario to London. Data last updated September 12, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to London. Data last updated September 12, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 9/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2012:19 pm -
1 stop15h 01m
Tue 10/611:40 am -
1 stop19h 03m
Deal found 9/9![Virgin Atlantic logo]()
$736
This Delta deal was found by Cheapflights users on 9/12. 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 9/299:52 am -
2 stops17h 28m
Tue 10/66:30 am -
2 stops18h 42m
Deal found 9/12![Delta logo]()
$744
This Delta deal was found by Cheapflights users on 9/8. 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 10/36:00 pm -
1 stop33h 20m
Wed 10/2111:40 am -
1 stop19h 03m
Deal found 9/8![Delta logo]()
$751
This flugladen.de deal was found by Cheapflights users on 9/11. 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 flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/46:02 am -
1 stop25h 03m
Tue 10/205:00 pm -
1 stop33h 00m
Deal found 9/11![Alaska Airlines logo]()
$735
This Delta deal was found by Cheapflights users on 9/8. 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 10/47:05 am -
1 stop15h 20m
Fri 10/167:50 pm -
2 stops23h 16m
Deal found 9/8![Delta logo]()
$750
This oojo deal was found by Cheapflights users on 9/9. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/52:13 pm -
1 stop16h 52m
Tue 10/135:00 pm -
1 stop28h 16m
Deal found 9/9![Alaska Airlines logo]()
$733
This Delta deal was found by Cheapflights users on 9/8. 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 10/611:56 am -
1 stop15h 24m
Wed 10/2111:40 am -
1 stop19h 03m
Deal found 9/8![Delta logo]()
$746
This oojo deal was found by Cheapflights users on 9/12. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:13 am -
1 stop19h 52m
Tue 10/205:00 pm -
1 stop28h 16m
Deal found 9/12![Alaska Airlines logo]()
$732
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/137:07 am -
2 stops18h 18m
Tue 10/2010:35 am -
2 stops20h 08m
Deal found 9/11![Delta logo]()
$758
This Gotogate deal was found by Cheapflights users on 9/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/256:02 am -
1 stop23h 18m
Tue 11/102:45 pm -
1 stop35h 32m
Deal found 9/11![Alaska Airlines logo]()
$745
This Booking.com deal was found by Cheapflights users on 9/9. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2611:13 am -
1 stop18h 07m
Tue 11/32:45 pm -
1 stop28h 33m
Deal found 9/9![Alaska Airlines logo]()
$737
This Delta deal was found by Cheapflights users on 9/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:20 am -
1 stop21h 20m
Tue 11/36:20 am -
2 stops24h 23m
Deal found 9/11![Delta logo]()
$739
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 September 12, 2026.
Search for one-way flight options from Ontario to London. Find affordable one-way fares based on user searches. Data last updated September 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Fri 10/98:00 am -
2 stops42h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Multiple Airlines logo]()
$313
This Kiwi.com deal was found by Cheapflights users on 9/8. 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.
Tue 10/611:45 am -
3 stops38h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Multiple Airlines logo]()
$315
This oojo deal was found by Cheapflights users on 9/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/2210:39 pm -
1 stop14h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![JetBlue logo]()
$316
This oojo deal was found by Cheapflights users on 9/7. 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 9/2810:39 pm -
1 stop14h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![JetBlue logo]()
$317
This Expedia deal was found by Cheapflights users on 9/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/104:25 pm -
1 stop13h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![British Airways logo]()
$320
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3012:41 pm -
1 stop13h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![British Airways logo]()
$322
This Justfly.com deal was found by Cheapflights users on 9/9. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/812:00 pm -
1 stop16h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Alaska Airlines logo]()
$323
This Goibibo deal was found by Cheapflights users on 9/9. 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 Goibibo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/82:22 pm -
1 stop13h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![British Airways logo]()
$324
This CheapOair deal was found by Cheapflights users on 9/8. 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 10/1811:05 pm -
1 stop13h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![JetBlue logo]()
$325
This Jetabroad deal was found by Cheapflights users on 9/12. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/1311:05 pm -
1 stop13h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![JetBlue logo]()
$327
This Jetabroad deal was found by Cheapflights users on 9/11. 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 Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1710:42 pm -
1 stop14h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/11![JetBlue logo]()
$328
This FlightHub deal was found by Cheapflights users on 9/8. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/510:34 am -
1 stop17h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![British Airways 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 September 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $732 (oojo) |
One-way from | $313 (Kiwi.com) |
Popular in | July |
Cheapest in | March |
Average price | $923 |
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 7,457,451 searches. Data last updated September 12, 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 Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 1/6
6:00 am-7:25 am
1 stop17h 25m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$329
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Mon 10/5
10:42 pm-8:45 pm
1 stop14h 03m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$329
OntarioLondon
ONT Ontario - LGW London Gatwick
ONTLGW
Ontario
Tue 10/20
2:13 pm-6:25 pm
3 stops20h 12m
London Gatwick
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$415
OntarioLondon
ONT Ontario - SEN London Southend
ONTSEN
Ontario
Tue 11/24
10:40 pm-6:35 pm
3 stops35h 55m
London Southend
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$438
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 10/7
10:42 pm-8:45 pm
1 stop14h 03m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$439
OntarioLondon
ONT Ontario - SEN London Southend
ONTSEN
Ontario
Thu 11/26
8:02 am-5:15 pm
3 stops25h 13m
London Southend
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$461
Quickest round-trip
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Sun 10/11
1:24 pm-9:40 am
1 stop12h 16m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$463
OntarioLondon
ONT Ontario - LHR London Heathrow
ONTLHR
Ontario
Wed 10/7
1:52 pm-11:10 am
1 stop13h 18m
London Heathrow
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$463
OntarioLondon
ONT Ontario - LCY London City
ONTLCY
Ontario
Mon 10/12
6:20 am-9:30 am
2 stops19h 10m
London City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$480
OntarioLondon
ONT Ontario - LCY London City
ONTLCY
Ontario
Wed 10/7
5:03 pm-4:40 pm
2 stops15h 37m
London City
Wed 12/31
12:00 am-3:00 pm
Nonstop0h 00m
$480
Showing 1-10 of 60 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 September.
| 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-LHR
ONT-LGW
ONT-LCY
ONT-SEN
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-LCY
ONT-SEN
What is the cheapest month to book a flight from Ontario to London?
Currently, February is the cheapest month in which you can book a flight from Ontario to London (average of $654). Flying from Ontario to London in July is currently the most expensive (average of $1,326). 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?
Airfare is below average for this route at the moment.
Ontario to London flights typically cost between $922 and $1,160 in October.The cheapest round-trip price found within the last 5 days was $732 on Alaska Airlines (Oct 13-Oct 20).
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 September 12, 2026.
Get a feel of what it's like to fly with Delta,United Airlines, andVirgin Atlantic 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
Comfort
7.8
Boarding
8.1
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Comfort
7.8
Boarding
8.1
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Comfort
7.8
Boarding
8.1
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Comfort
7.8
Boarding
8.1
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Crew
8.5
Comfort
7.8
Boarding
8.1
Overall
7.8
Food
7.2
Entertainment
7.8
Reviews
1 / 20
10.0
ExcellentAaron,Oct 2024
LAX - LHR
Related info for your journey
Find useful and relevant information for your journey from Ontario to 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
Gatwick
Hounslow
Harrow
Wembley
Southend-on-Sea
Basingstoke
Watford
Dartford
Winchester
Croydon
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
Harlow
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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Complete your trip
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Search flights from Ontario to London by cabin class
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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 September 12, 2026.
Ontario and London flights
Browse other Ontario and London flight options. Last updated on September 12, 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 September 12, 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 7,457,451 searches. Data last updated September 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$488 | Average$1,016 | FlexibilityNo cancel fee | On-time72% | |
| Cheapest$615 | Average$872 | FlexibilityNo cancel fee | On-time70% | |
| Cheapest$624 | Average$986 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$665 | Average$1,168 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$806 | Average$1,592 | FlexibilityNo cancel fee | On-time75% |