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 10/19. 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.
...and more
Everything you should know
Cheapest round-trip
$631
Typical prices: $686-$1,179
Multiple Airlines
Thu 11/22Tue 12/4
ONT - LHR • 3 stops
Cheapest one-way
$317
Typical prices: $482-$688
JetBlue
Fri 10/19
ONT - LHR • 1 stop
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.
Cheap flights from Ontario to London with top airlines, updated regularly. Compare round-trip, one-way, direct and last-minute deals.
Sun, Nov 22 - Fri, Dec 4
10:40 pm - 5:40 pmONT Ontario-LHR London Heathrow
35h 00m3 stops Las Vegas Harry Reid Intl San Francisco Kastrup Copenhagen
7:30 pm - 11:23 pmLHR London Heathrow-ONT Ontario
35h 53m2 stops Kastrup Copenhagen San Francisco
$631Multiple Airlines
Tue, Nov 17 - Tue, Nov 24
10:35 am - 9:40 pmONT Ontario-LHR London Heathrow
27h 05m3 stops Las Vegas Harry Reid Intl San Francisco Kastrup Copenhagen
6:40 am - 12:24 amLHR London Heathrow-ONT Ontario
25h 44m2 stops Kastrup Copenhagen San Francisco
$667Multiple Airlines
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
$751United Airlines
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
Mon, Jan 11 - Fri, Jan 22
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
Tue, Feb 2 - Tue, Feb 9
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
Mon, Mar 8 - Tue, Mar 23
12:49 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 11m1 stop Dallas/Fort Worth
1:50 pm - 10:25 pmLHR London Heathrow-ONT Ontario
15h 35m1 stop Dallas/Fort Worth
$846British Airways
Tue, Feb 2 - Tue, Feb 9
4:19 pm - 1:35 pmONT Ontario-LHR London Heathrow
13h 16m1 stop Phoenix Sky Harbor Intl
11:15 am - 6:51 pmLHR London Heathrow-ONT Ontario
15h 36m1 stop Dallas/Fort Worth
$848British Airways
Tue, Feb 9 - Wed, Feb 17
1:00 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Salt Lake City
10:00 am - 10:14 pmLHR London Heathrow-ONT Ontario
20h 14m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$875Delta
Sun, Feb 7 - Wed, Feb 17
12:00 pm - 9:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Atlanta Hartsfield-Jackson
10:00 am - 10:14 pmLHR London Heathrow-ONT Ontario
20h 14m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
$875Delta
Mon, Oct 19
11:05 pm - 8:45 pmONT Ontario-LHR London Heathrow
13h 40m1 stop New York John F Kennedy Intl
$317JetBlue
Wed, Jan 13
2:21 pm - 12:15 pmONT Ontario-LHR London Heathrow
13h 54m1 stop Dallas/Fort Worth
$318British Airways
Sun, Jan 17
4:19 pm - 1:35 pmONT Ontario-LHR London Heathrow
13h 16m1 stop Phoenix Sky Harbor Intl
$319British Airways
Tue, Jan 26
11:36 am - 12:20 pmONT Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
$322Alaska Airlines
Tue, Jan 5
1:00 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Salt Lake City
$324Virgin Atlantic
Tue, Jan 5
1:00 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Salt Lake City
$325Virgin Atlantic
Mon, Mar 29
1:00 pm - 10:00 amONT Ontario-LHR London Heathrow
13h 00m1 stop Salt Lake City
$325KLM
Sat, Feb 13
4:00 pm - 12:20 pmONT Ontario-LHR London Heathrow
36h 20m1 stop Seattle/Tacoma Intl
$327Alaska Airlines
Mon, Jan 11
7:00 am - 10:40 amONT Ontario-LHR London Heathrow
19h 40m1 stop Seattle/Tacoma Intl
$329Delta
Tue, Jan 19
7:00 am - 11:40 amONT Ontario-LHR London Heathrow
20h 40m1 stop Atlanta Hartsfield-Jackson
$329Delta
Sat, Oct 10 - Sat, Nov 14
11:05 pm - 9:30 amONT Ontario-LHR London Heathrow
26h 25m1 stop New York John F Kennedy Intl
2:30 pm - 12:29 pmLHR London Heathrow-ONT Ontario
29h 59m2 stops Vancouver Intl San Francisco
$940Multiple Airlines
Thu, Oct 15 - Thu, Oct 29
12:01 pm - 5:40 pmONT Ontario-LHR London Heathrow
21h 39m2 stops San Francisco Kastrup Copenhagen
6:40 am - 11:16 amLHR London Heathrow-ONT Ontario
35h 36m3 stops Kastrup Copenhagen San Francisco Las Vegas Harry Reid Intl
$980Multiple Airlines
Tue, Oct 13 - Tue, Oct 20
11:13 am - 3:05 pmONT Ontario-LHR London Heathrow
19h 52m1 stop Seattle/Tacoma Intl
5:00 pm - 10:17 amLHR London Heathrow-ONT Ontario
25h 17m1 stop Seattle/Tacoma Intl
$1,003Alaska Airlines
Wed, Oct 14 - Thu, Oct 22
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
$1,016Alaska Airlines
Tue, Oct 13 - Thu, Oct 22
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
$1,025British Airways
Sat, Oct 10 - Sat, Nov 14
6:00 pm - 8:10 pmONT Ontario-LHR London Heathrow
18h 10m2 stops Seattle/Tacoma Intl New York John F Kennedy Intl
6:30 am - 5:16 pmLHR London Heathrow-ONT Ontario
18h 46m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$1,041Delta
Sat, Oct 10 - Sat, Nov 14
5:03 pm - 8:10 pmONT Ontario-LHR London Heathrow
19h 07m2 stops Salt Lake City New York John F Kennedy Intl
6:30 am - 11:00 pmLHR London Heathrow-ONT Ontario
24h 30m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
$1,041Delta
Thu, Oct 15 - Wed, Oct 21
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
$1,074British Airways
Thu, Oct 15 - Wed, Oct 21
6:00 am - 7:45 amONT Ontario-LHR London Heathrow
17h 45m1 stop Houston George Bush Intcntl
8:40 am - 10:49 pmLHR London Heathrow-ONT Ontario
22h 09m2 stops Zurich Chicago O'Hare Intl
$1,106United Airlines
Tue, Oct 13 - Sun, Oct 18
7:00 am - 9:20 amONT Ontario-LHR London Heathrow
18h 20m2 stops Chicago O'Hare Intl Newark
6:50 am - 10:49 pmLHR London Heathrow-ONT Ontario
23h 59m2 stops Brussels Bruxelles-National Chicago O'Hare Intl
$1,112United Airlines
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
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 27% cheaper than the average day, while Wednesday is the most expensive, with prices 7% 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.
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 Phoenix Sky Harbor Intl (PHX) offer the most affordable fares, with an average round-trip price of $916. 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.
Find direct flights to and from Ontario and London
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.