ONT - LHR
$317 Find Cheap Flights from Ontario to London Heathrow Airport - Compare and Save
This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to London departing on 3/3. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Everything you should know
Cheapest round-trip
$752
Typical prices: $648-$1,054
United Airlines
Fri 3/2Mon 3/5
ONT - LHR • 1 stop
Cheapest one-way
$317
Typical prices: $513-$688
British Airways
Sat 3/3
ONT - LHR • 1 stop
Flight Deals
Cheap Flights from Ontario to London (ONT-LHR)
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.
Recent round-trip flight deals from Ontario to London
Tue, Mar 2 - Fri, Mar 5
6:35 pm - 7:25 amONT Ontario-LHR London Heathrow
28h 50m1 stop San Francisco
6:50 am - 6:44 pmLHR London Heathrow-ONT Ontario
19h 54m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$752United Airlines
Tue, Mar 2 - Fri, Mar 5
1:00 pm - 10:15 amONT Ontario-LHR London Heathrow
37h 15m2 stops Denver Intl Houston George Bush Intcntl
6:50 am - 6:44 pmLHR London Heathrow-ONT Ontario
19h 54m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$767United Airlines
Wed, Nov 4 - Mon, Nov 9
6:30 am - 7:30 pmONT Ontario-LHR London Heathrow
29h 00m2 stops Denver Intl Reykjavik Keflavik Intl
12:15 pm - 11:51 pmLHR London Heathrow-ONT Ontario
19h 36m2 stops Reykjavik Keflavik Intl Denver Intl
$799Multiple Airlines
Tue, Nov 10 - Tue, Nov 17
6:25 am - 10:50 amONT Ontario-LHR London Heathrow
20h 25m2 stops Denver Intl Reykjavik Keflavik Intl
12:15 pm - 11:51 pmLHR London Heathrow-ONT Ontario
19h 36m2 stops Reykjavik Keflavik Intl Denver Intl
$800Multiple Airlines
Sun, Jan 10 - Fri, Jan 22
11:36 am - 12:20 pmONT Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
2:45 pm - 10:41 pmLHR London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$802Alaska Airlines
Sun, Jan 17 - Wed, Jan 27
7:00 am - 12:20 pmONT Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
2:45 pm - 10:41 pmLHR London Heathrow-ONT Ontario
15h 56m1 stop Seattle/Tacoma Intl
$802Alaska Airlines
Wed, Mar 17 - Wed, Mar 31
5:02 pm - 1:35 pmONT Ontario-LHR London Heathrow
13h 33m1 stop Phoenix Sky Harbor Intl
2:25 pm - 9:28 pmLHR London Heathrow-ONT Ontario
15h 03m1 stop Dallas/Fort Worth
$842British Airways
Wed, Mar 17 - Mon, Mar 22
5:02 pm - 1:35 pmONT Ontario-LHR London Heathrow
13h 33m1 stop Phoenix Sky Harbor Intl
2:35 pm - 10:07 pmLHR London Heathrow-ONT Ontario
14h 32m1 stop Phoenix Sky Harbor Intl
$842British Airways
Mon, Oct 26 - Tue, Nov 3
7:07 am - 7:50 amONT Ontario-LHR London Heathrow
17h 43m1 stop Atlanta Hartsfield-Jackson
6:30 am - 10:43 pmLHR London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$902Delta
Wed, Oct 28 - Thu, Nov 26
1:35 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 25m1 stop Salt Lake City
6:30 am - 5:16 pmLHR London Heathrow-ONT Ontario
18h 46m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$903Delta
Recent one-way flight deals from Ontario to London
Wed, Mar 3
4:59 pm - 1:35 pmONT Ontario-LHR London Heathrow
12h 36m1 stop Phoenix Sky Harbor Intl
$317British Airways
Mon, Oct 19
11:05 pm - 8:45 pmONT Ontario-LHR London Heathrow
13h 40m1 stop New York John F Kennedy Intl
$317JetBlue
Sat, Oct 17
10:42 pm - 8:45 pmONT Ontario-LHR London Heathrow
14h 03m1 stop New York John F Kennedy Intl
$317JetBlue
Sun, Jan 10
2:21 pm - 12:00 pmONT Ontario-LHR London Heathrow
13h 39m1 stop Dallas/Fort Worth
$319British Airways
Sun, Mar 28
7:00 am - 3:35 pmONT Ontario-LHR London Heathrow
24h 35m1 stop Seattle/Tacoma Intl
$321Virgin Atlantic
Sun, Jan 24
11:36 am - 12:20 pmONT Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
$322Alaska Airlines
Tue, Dec 29
6:00 am - 12:20 pmONT Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
$322Alaska Airlines
Mon, Feb 8
12:00 pm - 9:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Atlanta Hartsfield-Jackson
$329Delta
Wed, Dec 30
11:59 am - 10:40 amONT Ontario-LHR London Heathrow
14h 41m1 stop Seattle/Tacoma Intl
$329Delta
Thu, Jan 28
12:00 pm - 9:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Atlanta Hartsfield-Jackson
$375Virgin Atlantic
Recent last minute flight deals from Ontario to London
Sun, Oct 4 - Tue, Oct 13
10:39 pm - 9:30 amONT Ontario-LHR London Heathrow
26h 51m1 stop New York John F Kennedy Intl
11:55 am - 10:12 pmLHR London Heathrow-ONT Ontario
18h 17m1 stop New York John F Kennedy Intl
$889JetBlue
Tue, Oct 6 - Tue, Oct 13
10:42 pm - 8:45 pmONT Ontario-LHR London Heathrow
14h 03m1 stop New York John F Kennedy Intl
8:15 am - 10:12 pmLHR London Heathrow-ONT Ontario
21h 57m1 stop New York John F Kennedy Intl
$891JetBlue
Tue, Oct 6 - Thu, Oct 15
9:45 am - 10:20 amONT Ontario-LHR London Heathrow
16h 35m2 stops Salt Lake City Minneapolis St Paul
11:45 am - 10:43 pmLHR London Heathrow-ONT Ontario
18h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$1,062Delta
Sun, Oct 4 - Mon, Nov 2
1:24 pm - 9:40 amONT Ontario-LHR London Heathrow
12h 16m1 stop Denver Intl
11:05 am - 6:47 pmLHR London Heathrow-ONT Ontario
39h 42m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$1,070United Airlines
Wed, Oct 7 - Thu, Oct 15
1:24 pm - 9:40 amONT Ontario-LHR London Heathrow
12h 16m1 stop Denver Intl
4:15 pm - 10:51 pmLHR London Heathrow-ONT Ontario
14h 36m1 stop San Francisco
$1,086United Airlines
Wed, Oct 7 - Thu, Oct 15
2:13 pm - 3:05 pmONT Ontario-LHR London Heathrow
16h 52m1 stop Seattle/Tacoma Intl
5:00 pm - 11:42 pmLHR London Heathrow-ONT Ontario
14h 42m1 stop Seattle/Tacoma Intl
$1,086Alaska Airlines
Mon, Oct 5 - Thu, Nov 19
11:13 am - 3:05 pmONT Ontario-LHR London Heathrow
19h 52m1 stop Seattle/Tacoma Intl
2:45 pm - 11:06 pmLHR London Heathrow-ONT Ontario
16h 21m1 stop Seattle/Tacoma Intl
$1,087Alaska Airlines
Tue, Oct 6 - Thu, Oct 15
1:05 pm - 10:30 amONT Ontario-LHR London Heathrow
13h 25m1 stop Phoenix Sky Harbor Intl
10:05 am - 3:16 pmLHR London Heathrow-ONT Ontario
13h 11m1 stop Phoenix Sky Harbor Intl
$1,095British Airways
Tue, Oct 6 - Tue, Oct 13
1:05 pm - 10:30 amONT Ontario-LHR London Heathrow
13h 25m1 stop Phoenix Sky Harbor Intl
10:05 am - 3:24 pmLHR London Heathrow-ONT Ontario
13h 19m1 stop Phoenix Sky Harbor Intl
$1,096British Airways
Mon, Oct 5 - Sun, Oct 11
12:29 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 31m1 stop Salt Lake City
11:40 am - 10:43 pmLHR London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
$1,137Delta
Booking Insights
Price, demand and travel trends for Ontario to London Heathrow Airport flights
Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.
Prices
Airlines
Layovers
How much is a round-trip flight from Ontario to London Heathrow Airport?
This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to London Heathrow Airport departing in march.What's the cheapest day of the week to fly from Ontario to London Heathrow Airport?
Based on deals KAYAK users found in the last 12 months, Thursday is the cheapest day of the week to fly from Ontario to London Heathrow Airport. It’s 18% cheaper than the average day, while Sunday is the most expensive, with prices 17% higher.
What’s the cheapest month to fly from Ontario to London Heathrow Airport?
KAYAK internal proprietary data takes all prices for each month over the last 12 months for round-trip flights from Ontario to London Heathrow Airport, removes the top 0.1% to account for outliers and then takes the median of all values for each month.•June is the cheapest month to fly from Ontario to London Heathrow Airport at $530 round-trip.
•July ($1,327) and January ($1,267) are the most expensive months.
•The price difference between flying in the cheapest and most expensive months is 150% on average.
This is based on KAYAK aggregated and averaged internal data over the past 12 months.
Round-trip flights from Ontario to London Heathrow Airport typically range from $648 to $1,054. The lowest price found in the past 5 days was $752, on United Airlines.
What’s the most popular layover airport when flying from Ontario to London Heathrow Airport?
KAYAK data for 1-stop round-trips over the past 3 months. Only counts itineraries with the same layover on both legs.Dallas/Fort Worth (DFW) is the most popular layover for the Ontario to London Heathrow Airport route. 30% of KAYAK users who booked 1-stop round-trips over the past 3 months connected via DFW.
What is the cheapest layover airport when flying from Ontario to London Heathrow Airport?
Flights via Atlanta Hartsfield-Jackson (ATL) offer the most affordable fares, with an average round-trip price of $580. Based on KAYAK data over the past 3 months.
Key details for Ontario to London Heathrow Airport flights
Low season | February |
|---|---|
High season | July |
Cheapest flight | $317 |
When to book flights from Ontario to London
Are your dates flexible? Find out the best times to travel from Ontario to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.
Your Ontario to London Heathrow Airport flight questions, answered
Find helpful answers about this route, including flight times, airports, airlines and booking tips.
Your guide to booking Ontario to London Heathrow Airport flights
Get tips on when to book, when to fly and what to know before your trip.More options for your flight from Ontario to London
Complete your trip to London with a hotel stay or car rental
Information on your arrival and departure airports
Cabin class types available on flights to London
Cabin classes available on flights from Ontario to London. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
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Flights from domestic origins to London
Choose which airport to fly into in Ontario
Flights to other popular destinations
The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.