Cheap Flights from Ontario, CA to London from $203

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On Cheapflightsplus.com you will find 648 connecting flights from Ontario to London. You can compare airfare deals from 12 airlines and multiple travel sites from $203, book and save on cheap plane tickets and last minute offers. Also check out ONT-LON flight schedule to find best flight time, convenient departure and arrival airports.

Find One-Way and Round-Trip Ontario to London Flight Deals

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $203 (one-way), $348 (round-trip).

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Best Flights from Ontario to London Today

Take a look at the list of non stop flights and flights with layovers from Ontario to London with the lowest price of $203. Take a look at the list of flights with layovers from Ontario to London from $203. There’re no direct flights. The fastest connecting flight – 11h 41m.

Price	Departure	Arrival	Flight Duration	Airline	Flight
from $309 Find flight	15:00 Ontario Ontario Int.	12:30+1 день London Heathrow	13h 30m layover 1h 15m - Dallas	British Airways	BA5111 BA1522
from $323 Find flight	13:15 Ontario Ontario Int.	09:40+1 день London Heathrow	12h 25m layover 1h 3m - Denver	United Airlines	UA1417 UA27
from $363 Find flight	00:59 Ontario Ontario Int.	10:50+1 день London Heathrow	25h 51m layover 13h 38m - Dallas	British Airways	BA6571 BA1531
from $203 Find flight	17:21 Ontario Ontario Int.	10:00+2 дня London Gatwick	32h 39m layover 3h 41m - Denver 14h 30m - Orlando	Frontier Airlines	F92908 F91734 Z0784
from $208 Find flight	21:41 Ontario Ontario Int.	10:00+3 дня London Gatwick	52h 19m layover 21h 39m - San Francisco 15h 6m - Orlando	Frontier Airlines	F92677 F91646 Z0784
from $218 Find flight	00:59 Ontario Ontario Int.	10:00+1 день London Gatwick	25h 1m layover 4h 26m - Denver 6h 0m - Orlando	Frontier Airlines	F91500 F93312 Z0784
from $223 Find flight	19:36 Ontario Ontario Int.	10:00+2 дня London Gatwick	30h 24m layover 2h 15m - Las Vegas 13h 47m - Orlando	Frontier Airlines	F94758 F91876 Z0784
from $223 Find flight	12:48 Ontario Ontario Int.	10:00+2 дня London Gatwick	37h 12m layover 2h 38m - Houston 19h 51m - Orlando	Frontier Airlines	F93132 F94978 Z0784
from $243 Find flight	17:26 Ontario Ontario Int.	06:20+2 дня London Gatwick	28h 54m layover 2h 47m - Las Vegas 12h 50m - New York	Frontier Airlines	F91358 F93238 Z0702
from $254 Find flight	00:59 Ontario Ontario Int.	10:50+1 день London Heathrow	25h 51m layover 12h 21m - Denver 1h 35m - Reykjavik	Frontier Airlines	F91500 FI670 FI450
from $255 Find flight	07:10 Ontario Ontario Int.	06:20+2 дня London Gatwick	39h 10m layover 1h 3m - Portland 23h 21m - New York	Alaska Airlines	AS1058 AS294 Z0702
from $262 Find flight	06:00 Ontario Ontario Int.	11:45+1 день London Gatwick	21h 45m layover 7h 3m - Seattle 1h 20m - Reykjavik	Hawaiian Airlines	HA6288 FI680 FI470
from $262 Find flight	06:00 Ontario Ontario Int.	14:40+1 день London Gatwick	24h 40m layover 10h 15m - Seattle 1h 5m - Reykjavik	Hawaiian Airlines	HA6288 FI682 FI472
from $262 Find flight	15:04 Ontario Ontario Int.	14:40+2 дня London Gatwick	39h 36m layover 5h 46m - Seattle 20h 30m - Reykjavik	Hawaiian Airlines	HA6290 FI684 FI472
from $267 Find flight	13:31 Ontario Ontario Int.	20:20+1 день London Heathrow	22h 49m layover 2h 46m - Seattle 6h 45m - Reykjavik	Hawaiian Airlines	HA6289 FI682 FI454
from $267 Find flight	06:00 Ontario Ontario Int.	20:20+1 день London Heathrow	30h 20m layover 10h 15m - Seattle 6h 45m - Reykjavik	Hawaiian Airlines	HA6288 FI682 FI454

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*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on July 03, 2025

Flight Schedule Ontario (California) to London

Full flight schedule will help you in detecting at what time planes fly from Ontario to London. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.

Departure	Flight Details	Flight Duration	Price
00:59 — 06:25 +1 day	00:59 — 05:57 BA6571 British Airways Ontario — Dallas 9h 18m stop 15:15 — 06:25 BA1505 British Airways Dallas — London	21h 26m including layover	Find flight from$347
00:59 — 09:00 +1 day	00:59 — 05:57 BA6571 British Airways Ontario — Dallas 11h 53m stop 17:50 — 09:00 BA1589 British Airways Dallas — London	24h 1m including layover	Find flight from$347
05:10 — 09:40 +1 day	05:10 — 08:27 UA2446 United Airlines Ontario — Denver 9h 8m stop 17:35 — 09:40 UA27 United Airlines Denver — London	20h 30m including layover	Find flight from$364
05:10 — 12:20 +1 day	05:10 — 08:27 UA2446 United Airlines Ontario — Denver 11h 53m stop 20:20 — 12:20 UA262 United Airlines Denver — London	23h 10m including layover	Find flight from$364
06:38 — 09:00 +1 day	06:10 — 11:14 BA5107 British Airways Ontario — Dallas 6h 16m stop 17:50 — 09:00 BA1589 British Airways Dallas — London	18h 22m including layover	Find flight from$309
06:38 — 12:30 +1 day	06:15 — 11:14 BA5107 British Airways Ontario — Dallas 9h 36m stop 21:30 — 12:45 BA1522 British Airways Dallas — London	21h 52m including layover	Find flight from$309
07:00 — 06:20 +1 day	07:00 — 13:03 UA2226 United Airlines Ontario — Chicago 2h 57m stop 16:00 — 06:20 UA929 United Airlines Chicago — London	15h 20m including layover	Find flight from$364
07:00 — 08:20 +1 day	07:00 — 13:03 UA2226 United Airlines Ontario — Chicago 4h 57m stop 18:00 — 08:20 UA920 United Airlines Chicago — London	17h 20m including layover	Find flight from$364
08:43 — 06:25 +1 day	12:53 — 17:50 BA5110 British Airways Ontario — Dallas 1h 35m stop 16:20 — 07:20 BA1505 British Airways Dallas — London	13h 42m including layover	Find flight from$309
08:43 — 10:50 +1 day	07:30 — 12:29 BA5110 British Airways Ontario — Dallas 6h stop 19:35 — 10:50 BA1531 British Airways Dallas — London	18h 7m including layover	Find flight from$309
09:35 — 07:25 +1 day	09:35 — 10:54 UA1585 United Airlines Ontario — San Francisco 2h 11m stop 13:05 — 07:25 UA901 United Airlines San Francisco — London	13h 50m including layover	Find flight from$323
09:35 — 10:25 +1 day	09:35 — 10:54 UA1585 United Airlines Ontario — San Francisco 5h 11m stop 16:05 — 10:25 UA948 United Airlines San Francisco — London	16h 50m including layover	Find flight from$364
10:54 — 12:30 +1 day	10:51 — 15:49 BA5109 British Airways Ontario — Dallas 5h 20m stop 21:30 — 12:45 BA1522 British Airways Dallas — London	17h 36m including layover	Find flight from$309
10:54 — 06:25 +2 days	10:53 — 15:54 BA5109 British Airways Ontario — Dallas 23h 25m stop 15:10 — 06:25 BA1505 British Airways Dallas — London	35h 31m including layover	Find flight from$323
12:49 — 12:30 +1 day	12:41 — 17:40 BA5108 British Airways Ontario — Dallas 3h 25m stop 21:30 — 12:45 BA1522 British Airways Dallas — London	15h 41m including layover	Find flight from$309
12:49 — 06:25 +2 days	12:41 — 17:40 BA5108 British Airways Ontario — Dallas 21h 30m stop 15:10 — 06:25 BA1505 British Airways Dallas — London	33h 36m including layover	Find flight from$323
13:15 — 09:40 +1 day	13:15 — 16:32 UA1417 United Airlines Ontario — Denver 1h 3m stop 17:35 — 09:40 UA27 United Airlines Denver — London	12h 25m including layover	Find flight from$323
13:15 — 12:20 +1 day	13:15 — 16:32 UA1417 United Airlines Ontario — Denver 3h 48m stop 20:20 — 12:20 UA262 United Airlines Denver — London	15h 5m including layover	Find flight from$323
15:00 — 12:30 +1 day	14:44 — 19:43 BA5111 British Airways Ontario — Dallas 1h 15m stop 21:30 — 12:45 BA1522 British Airways Dallas — London	13h 30m including layover	Find flight from$309
15:00 — 14:25 +1 day	14:44 — 19:43 BA5111 British Airways Ontario — Dallas 2h 59m stop 22:59 — 14:25 BA1521 British Airways Dallas — London	15h 25m including layover	Find flight from$309
17:09 — 14:40 +1 day	16:50 — 18:15 BA6795 British Airways Ontario — Phoenix 2h 15m stop 20:40 — 14:40 BA288 British Airways Phoenix — London	13h 31m including layover	Find flight from$309
17:09 — 12:50 +1 day	16:50 — 18:15 BA6795 British Airways Ontario — Phoenix 25m stop 18:45 — 12:50 BA1527 British Airways Phoenix — London	11h 41m including layover	Find flight from$347
18:38 — 09:40 +2 days	18:34 — 21:53 UA368 United Airlines Ontario — Denver 19h 40m stop 17:40 — 09:40 UA27 United Airlines Denver — London	31h 2m including layover	Find flight from$337
18:38 — 12:20 +2 days	18:34 — 21:53 UA368 United Airlines Ontario — Denver 22h 25m stop 20:20 — 12:20 UA262 United Airlines Denver — London	33h 42m including layover	Find flight from$337
23:59 — 06:25 +2 days	23:59 — 04:56 BA5106 British Airways Ontario — Dallas 10h 20m stop 15:10 — 06:25 BA1505 British Airways Dallas — London	22h 26m including layover	Find flight from$312
23:59 — 09:00 +2 days	23:59 — 05:00 BA5106 British Airways Ontario — Dallas 12h 55m stop 17:50 — 09:00 BA1589 British Airways Dallas — London	25h 1m including layover	Find flight from$323

Departure	Arrival	Flight Details	Flight Time	Price
		stop stop	including layover	Find flight from$

*Departure and arrival times - local. Updated on July 3, 2025

Flight Information

Below we will explain in detail what the flights cost on the destination from Ontario to London depends on and how to choose the most interesting flight option for you.

Distance between Ontario and London is 8723 miles. Time difference between the cities is 8h. Airplanes depart 00:45 to 23:59 from 2 Ontario airports and arrive 00:45 to 23:59 to 10 London airports. Average flight time is 27h 33m.

The fastest flight 11h 41m
Average flight time 27h 33m
The earliest flight 00:45
The latest flight 23:59
Distance 5421 ml

The cheapest months to travel to London are july (from 271 $), november (from 325 $), september (from 340 $).

The most expensive months are february (from 573 $), december (from 568 $), january (from 511 $).

What is the lowest airfare Ontario to London?

The cheapest plane ticket found by our users is $203. This airfare is for economy class on one-way F92908 flight by Frontier Airlines for July 13, 2025 which leaves Ontario Int. in Ontario at 17:21 am and arrives at London Gatwick at 10:00.

Economy class

$203

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Business class

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First class

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Popular Airlines on the Route

The flight Ontario — London is served by 12 regular airlines and 3 low-cost airlines. Most of the flights on this route are operated by Air Canada - 78 departures per week at the price of from $ 303 . And the most expensive tickets are offered by China Airlines airline - from $ 4110.

Direct flights

There’re no direct flights on this route. Try flights with stops.

Connecting Flights

There are 648 flights with layovers on the route. The fastest connecting flight is BA6795 by British Airways takes 11h 41m and the cheapest is F92908 by Frontier Airlines for $203.

AS - Alaska Airlines

from $255

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AC - Air Canada

from $303

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F9 - Frontier Airlines

from $203

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AV - Avianca

from $777

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CI - China Airlines

from $3996

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HA - Hawaiian Airlines

from $262

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IB - Iberia

from $532

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Y4 - Volaris

from $418

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UA - United Airlines

from $323

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VS - Virgin Atlantic Airways

from $402

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JX - Jambojet

from $3876

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BA - British Airways

from $309

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Airports

You can fly from Ontario to London from 2 airports (Ontario Int., International Heliport).

Ontario airports

Ontario Int.-ONT

from $203
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International Heliport-JIO

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London airports

London City-LCY

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London-Waterloo-QQW

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Heathrow-LHR

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Luton-LTN

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British Rail Terminal-ZLX

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London Biggin Hill-BQH

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Stansted-STN

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Gatwick-LGW

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Ebbsfleet International Rail St-XQE

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Stratford International Rail St-XOF

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Airplanes

There are flights to London from Ontario by 12 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.

Top Domestic Destinations from Ontario

You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.

Ontario — Phoenix

from $56

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Ontario — Denver

from $65

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Ontario — Austin

from $67

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Ontario — Miami

from $62

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Ontario — Tucson

from $80

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Ontario — Las Vegas

from $63

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Ontario — Seattle

from $65

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Ontario — Boise

from $70

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Ontario — Chicago

from $78

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Ontario — Philadelphia

from $62

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Top International Destinations from Ontario

Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.

Ontario — London

from $62

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Ontario — San Jose

from $61

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Ontario — Guadalajara

from $70

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Ontario — Cancun

from $74

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How to book a plane ticket yourself?

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