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Cheap flights from the United States to London from $152

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to London departing on 8/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from the United States to London

Recent round-trip flight deals from the United States to London

Enter your travel dates to find the best prices.
WestJet Logo
6:05 pm - 5:20 am
SFO
-
YXU
8h 15m
1 stop
WestJet Logo
5:55 pm - 12:00 pm
YXU
-
SFO
21h 05m
1 stop
$358WestJet
Wed, Aug 12 - Mon, Aug 17
WestJet Logo
6:00 am - 1:50 pm
SFO
-
YXU
28h 50m
2 stops
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$368WestJet
Mon, Aug 17 - Wed, Aug 26
WestJet Logo
6:05 pm - 5:20 am
SFO
-
YXU
8h 15m
1 stop
WestJet Logo
5:55 pm - 9:55 pm
YXU
-
SFO
31h 00m
1 stop
$371WestJet
Mon, Aug 17 - Wed, Aug 26
WestJet Logo
6:05 pm - 5:20 am
SFO
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$374WestJet
Tue, Aug 18 - Fri, Aug 21
WestJet Logo
6:05 pm - 5:20 am
SFO
-
YXU
8h 15m
1 stop
WestJet Logo
2:40 pm - 9:55 pm
YXU
-
SFO
10h 15m
2 stops
$380WestJet
Tue, Aug 18 - Fri, Aug 21
WestJet Logo
6:00 am - 5:20 am
SFO
-
YXU
20h 20m
1 stop
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$385WestJet
Tue, Sep 15 - Sat, Sep 19
Air Canada Logo
8:10 am - 9:20 am
SFO
-
YXU
22h 10m
2 stops
Air Canada Logo
10:05 am - 8:51 pm
YXU
-
SFO
13h 46m
2 stops
$403Air Canada
Tue, Aug 18 - Fri, Aug 21
Air Canada Logo
8:10 am - 9:20 am
SFO
-
YXU
22h 10m
2 stops
Air Canada Logo
10:05 am - 8:51 pm
YXU
-
SFO
13h 46m
2 stops
$431Air Canada
Tue, Aug 18 - Fri, Aug 21
Multiple Airlines Logo
12:15 pm - 5:20 am
DEN
-
YXU
15h 05m
1 stop
Multiple Airlines Logo
6:10 am - 7:46 pm
YXU
-
DEN
15h 36m
2 stops
$482Multiple Airlines
Wed, Aug 12 - Wed, Aug 19
Air Canada Logo
8:45 am - 8:32 pm
ORD
-
YXU
10h 47m
2 stops
Air Canada Logo
10:05 am - 8:05 pm
YXU
-
ORD
11h 00m
2 stops
$616Air Canada
Thu, Jul 9 - Wed, Jul 15

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WestJet flights from United States to London, Ontario

Our best WestJet deals on United States to London, Ontario flight tickets
WestJet
Aug 12
SFO6:05 pmSan Francisco
8h 15m
1 stop
YXU5:20 amLondon
Aug 17
YXU5:55 pmLondon
21h 05m
1 stop
SFO12:00 pmSan Francisco
$358
WestJet
Aug 17
SFO6:00 amSan Francisco
28h 50m
2 stops
YXU1:50 pmLondon
Aug 26
YXU6:10 amLondon
8h 50m
1 stop
SFO12:00 pmSan Francisco
$368
WestJet
Aug 17
SFO6:05 pmSan Francisco
8h 15m
1 stop
YXU5:20 amLondon
Aug 26
YXU5:55 pmLondon
31h 00m
1 stop
SFO9:55 pmSan Francisco
$371

United Airlines flights from United States to London, Ontario

Our best United Airlines deals on United States to London, Ontario flight tickets
United Airlines
Aug 9
SFO12:50 amSan Francisco
11h 00m
2 stops
YXU2:50 pmLondon
Aug 17
YXU3:30 pmLondon
12h 20m
2 stops
SFO12:50 amSan Francisco
$620
United Airlines
Aug 7
MCO9:40 amOrlando
12h 00m
2 stops
YXU9:40 pmLondon
Aug 16
YXU5:40 amLondon
13h 52m
2 stops
MCO7:32 pmOrlando
$798
United Airlines
Aug 7
EWR9:00 amNewark
5h 50m
1 stop
YXU2:50 pmLondon
Aug 14
YXU3:30 pmLondon
3h 35m
1 stop
EWR7:05 pmNewark
$836

momondo Fare Finder

 
Customize your flight search to find flights from United States to London, Ontario 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, momondo users made 832,500 searches. Data last updated June 28, 2026.
Use the filters below to find and compare flights from the United States to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 8/12

6:05 pm-5:20 am

1 stop8h 15m

London

Mon 8/17

5:55 pm-12:00 pm

1 stop21h 05m

$358

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 8/17

6:00 am-1:50 pm

2 stops28h 50m

London

Wed 8/26

6:10 am-12:00 pm

1 stop8h 50m

$368

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 8/17

6:05 pm-5:20 am

1 stop8h 15m

London

Wed 8/26

5:55 pm-9:55 pm

1 stop31h 00m

$371
Quickest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/18

6:05 pm-5:20 am

1 stop8h 15m

London

Fri 8/21

6:10 am-12:00 pm

1 stop8h 50m

$374

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/18

6:05 pm-5:20 am

1 stop8h 15m

London

Fri 8/21

2:40 pm-9:55 pm

2 stops10h 15m

$380

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 9/15

6:00 am-5:20 am

1 stop20h 20m

London

Sat 9/19

6:10 am-12:00 pm

1 stop8h 50m

$385

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/18

8:10 am-9:20 am

2 stops22h 10m

London

Fri 8/21

10:05 am-8:51 pm

2 stops13h 46m

$403

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 8/18

8:10 am-9:20 am

2 stops22h 10m

London

Fri 8/21

10:05 am-8:51 pm

2 stops13h 46m

$431

DenverLondon

DEN - YXU

DENYXU

Denver Intl

Wed 8/12

12:15 pm-5:20 am

1 stop15h 05m

London

Wed 8/19

6:10 am-7:46 pm

2 stops15h 36m

$482

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Thu 7/9

8:45 am-8:32 pm

2 stops10h 47m

London

Wed 7/15

10:05 am-8:05 pm

2 stops11h 00m

$616

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from United States to London, Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to London, Ontario?

If you don’t want to visit London, Ontario in March, then you should wait until February to fly from United States, when ticket prices are also cheap, with an average price of $0.

Can stopping save me money on United States to London, Ontario flights?

You could potentially save up to 29% on your flight if you consider stops on a United States to London, Ontario flight.

Cheap United States to London, Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from United States to London, Ontario

Fastest flight time

3h 50m

Direct flights

None
The fastest flight from United States to London, Ontario takes 3h 50m
There are no direct flights from United States to London, Ontario. There are no popular flight routes from United States to London, Ontario.
Search flight deals

Frequently asked questions about flying from the United States to London, Ontario

  • When did momondo last update prices for flights from United States to London Airport?

    Prices for flights from United States to London Airport were last updated today.

  • How many operators does momondo search for flights from United States to London Airport?

  • How old do you have to be to fly from United States to London Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States to London Airport.

  • What documentation or ID do you need to fly to London Airport?

    The travel and health documents you'll need for your trip to London Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from United States to London, Ontario

Compare and see reviews for airlines that fly from United States to London, Ontario with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom $162Free CancellationRating
7.2
3,385 reviews
Search WestJet flights
Air CanadaPriceFrom $210Free CancellationRating
7.1
11,269 reviews
Search Air Canada flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Grand Bend
Port Stanley

Why use momondo?

Why should I use momondo to find a flight deal from United States to London?

It is quick and easy to find United States to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

Can I find flights from United States to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from United States with this policy.

How can momondo help me find flights from United States to London?

momondo helps you find the best flight between United States and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from United States to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from United States and alert you when they change.

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