Cheap Flights from Ontario, CA to London from $253

Return flight: London – Ontario
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On Cheapflightsplus.com you will find 970 connecting flights from Ontario to London. You can compare airfare deals from 13 airlines and multiple travel sites from $253, 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: $253 (one-way), $434 (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 $253. Take a look at the list of flights with layovers from Ontario to London from $253. There’re no direct flights. The fastest connecting flight – 11h 41m.
Price Departure Arrival Flight Duration Airline Flight
from $388
Find flight
23:59
Ontario
Ontario Int.
 06:25+2 дня
London
Heathrow
 22h 26m
layover
10h 20m - Dallas
 British Airways
BA5106
BA1505
from $401
Find flight
13:15
Ontario
Ontario Int.
 09:40+1 день
London
Heathrow
 12h 25m
layover
1h 3m - Denver
 United Airlines
UA1417
UA27
from $253
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 $303
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
Show all tickets
*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on September 15, 2025
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 Arrival Flight Details Flight Duration Price
06:00 — 07:25
+1 day
06:00 — 07:19 UA2647 United Airlines
Ontario — San Francisco
5h 41m stop
13:00 — 07:25 UA901 United Airlines
San Francisco — London
17h 25m
including layover
Find flight
from$406
06:00 — 10:25
+1 day
06:00 — 07:19 UA2647 United Airlines
Ontario — San Francisco
8h 41m stop
16:00 — 10:25 UA948 United Airlines
San Francisco — London
20h 25m
including layover
Find flight
from$406
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$401
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$401
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$401
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$401
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$401
13:35 — 10:25
+1 day
13:35 — 14:54 UA1840 United Airlines
Ontario — San Francisco
1h 11m stop
16:05 — 10:25 UA948 United Airlines
San Francisco — London
12h 50m
including layover
Find flight
from$401
15:00 — 06:25
+2 days
14:53 — 19:48 BA5111 British Airways
Ontario — Dallas
19h 20m stop
16:20 — 07:20 BA1505 British Airways
Dallas — London
31h 25m
including layover
Find flight
from$401
15:00 — 09:00
+2 days
14:40 — 19:43 BA5111 British Airways
Ontario — Dallas
21h 55m stop
17:50 — 09:00 BA1589 British Airways
Dallas — London
34h
including layover
Find flight
from$401
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$388
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$401
23:59 — 10:50
+2 days
23:59 — 04:56 BA5106 British Airways
Ontario — Dallas
14h 45m stop
19:35 — 10:50 BA1531 British Airways
Dallas — London
26h 51m
including layover
Find flight
from$401
23:59 — 12:30
+2 days
23:59 — 04:56 BA5106 British Airways
Ontario — Dallas
16h 15m stop
21:30 — 12:45 BA1522 British Airways
Dallas — London
28h 31m
including layover
Find flight
from$401
23:59 — 14:25
+2 days
23:59 — 04:56 BA5106 British Airways
Ontario — Dallas
17h 59m stop
22:59 — 14:25 BA1521 British Airways
Dallas — London
30h 26m
including layover
Find flight
from$401
*Departure and arrival times - local. Updated on September 15, 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 00:08 to 23:59 from 2 Ontario airports and arrive 00:08 to 23:59 to 10 London airports. Average flight time is 27h 40m.

  • The fastest flight 11h 41m
  • Average flight time 27h 40m
  • The earliest flight 00:08
  • The latest flight 23:59
  • Distance 5421 ml

The cheapest months to travel to London are july (from 253 $), november (from 303 $), september (from 303 $).

The most expensive months are february (from 534 $), december (from 529 $), january (from 476 $).

What is the lowest airfare Ontario to London?

The cheapest plane ticket found by our users is $253. This airfare is for economy class on one-way F92908 flight by Frontier Airlines for July 4, 2025 which leaves Ontario Int. in Ontario at 17:21 am and arrives at London Gatwick at 10:00.

Economy class
$253
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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 13 regular airlines and 3 low-cost airlines. Most of the flights on this route are operated by KLM - 1 departures per week at the price of from $ 949 . And the most expensive tickets are offered by China Airlines airline - from $ 5094.

Direct flights

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

Connecting Flights

There are 970 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 $253.

  • KL - KLM
    from $949
    Find
  • AC - Air Canada
    from $377
    Find
  • CI - China Airlines
    from $4892
    Find
  • UA - United Airlines
    from $401
    Find
  • JX - Jambojet
    from $4766
    Find
  • AS - Alaska Airlines
    from $317
    Find
  • F9 - Frontier Airlines
    from $253
    Find
  • AV - Avianca
    from $848
    Find
  • HA - Hawaiian Airlines
    from $325
    Find
  • IB - Iberia
    from $660
    Find
  • Y4 - Volaris
    from $519
    Find
  • VS - Virgin Atlantic Airways
    from $500
    Find
See more connecting flights

Airports

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

Ontario airports

  • Ontario Int.-ONT
    from $253
    Find
  • International Heliport-JIO
    Find

London airports

  • London City-LCY
    Find
  • London-Waterloo-QQW
    Find
  • Heathrow-LHR
    Find
  • Luton-LTN
    Find
  • British Rail Terminal-ZLX
    Find
  • London Biggin Hill-BQH
    Find
  • Stansted-STN
    Find
  • Gatwick-LGW
    Find
  • Ebbsfleet International Rail St-XQE
    Find
  • Stratford International Rail St-XOF
    Find

Airplanes

There are flights to London from Ontario by 13 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.

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.

How to book a plane ticket yourself?

How to book an air ticket yourself?
  • Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
  • Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
  • Click «Buy» when you are ready — our system will redirect you to the site that sells the selected flight ticket.
  • Fill in all passenger and payment information — passport and contact information, please double check all passengers’ names and make a payment for your itinerary.
  • That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.

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