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Cheap flights from the United States to London from $188

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 8/17. 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
6:00 am - 4:45 pm
SFO
-
YXU
7h 45m
1 stop
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$336WestJet
Thu, Oct 1 - Wed, Oct 7
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 4:00 pm
YXU
-
LAX
12h 50m
2 stops
$341WestJet
Fri, Sep 11 - Sun, Sep 13
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 12:25 pm
YXU
-
LAX
9h 15m
1 stop
$348WestJet
Wed, Sep 9 - Wed, Sep 16
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 4:00 pm
YXU
-
LAX
12h 50m
2 stops
$351WestJet
Thu, Sep 10 - Sun, Sep 13
Multiple Airlines Logo
12:07 pm - 5:20 am
SFO
-
YXU
14h 13m
2 stops
Multiple Airlines Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$380Multiple Airlines
Thu, Sep 10 - Thu, Sep 17
Air Canada Logo
4:30 pm - 9:20 am
SFO
-
YXU
13h 50m
2 stops
Air Canada Logo
5:40 am - 12:34 pm
YXU
-
SFO
9h 54m
1 stop
$411Air Canada
Wed, Sep 23 - Sat, Sep 26
Multiple Airlines Logo
11:00 am - 5:20 am
SFO
-
YXU
15h 20m
2 stops
Multiple Airlines Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$421Multiple Airlines
Thu, Aug 27 - Wed, Sep 9
Air Canada Logo
1:35 pm - 9:20 am
SFO
-
YXU
16h 45m
1 stop
Air Canada Logo
5:40 am - 12:34 pm
YXU
-
SFO
9h 54m
1 stop
$430Air Canada
Wed, Sep 23 - Sat, Sep 26
Air Canada Logo
12:15 pm - 9:20 am
SFO
-
YXU
18h 05m
2 stops
Air Canada Logo
5:40 am - 12:34 pm
YXU
-
SFO
9h 54m
1 stop
$430Air Canada
Wed, Sep 23 - Sat, Sep 26
Multiple Airlines Logo
6:00 am - 4:45 pm
SFO
-
YXU
7h 45m
1 stop
Multiple Airlines Logo
6:10 am - 6:00 pm
YXU
-
SFO
14h 50m
2 stops
$463Multiple Airlines
Thu, Oct 1 - Wed, Oct 7

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Air Canada flights from United States to London, Ontario

Our best Air Canada deals on United States to London, Ontario flight tickets
Air Canada
Sep 23
SFO4:30 pmSan Francisco
13h 50m
2 stops
YXU9:20 amLondon
Sep 26
YXU5:40 amLondon
9h 54m
1 stop
SFO12:34 pmSan Francisco
$411
Air Canada
Sep 23
SFO12:15 pmSan Francisco
18h 05m
2 stops
YXU9:20 amLondon
Sep 26
YXU5:40 amLondon
9h 54m
1 stop
SFO12:34 pmSan Francisco
$430
Air Canada
Sep 23
SFO4:30 pmSan Francisco
13h 50m
2 stops
YXU9:20 amLondon
Sep 26
YXU5:40 amLondon
18h 07m
2 stops
SFO8:47 pmSan Francisco
$444

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 11
SFO10:51 pmSan Francisco
7h 29m
1 stop
YXU9:20 amLondon
Aug 12
YXU3:30 pmLondon
22h 12m
2 stops
SFO10:42 amSan Francisco
$492
United Airlines
Aug 10
SFO12:45 amSan Francisco
13h 57m
2 stops
YXU5:42 pmLondon
Aug 12
YXU3:30 pmLondon
22h 12m
2 stops
SFO10:42 amSan Francisco
$502
United Airlines
Aug 27
SFO9:30 pmSan Francisco
14h 20m
2 stops
YXU2:50 pmLondon
Aug 31
YXU6:20 pmLondon
17h 48m
1 stop
SFO9:08 amSan Francisco
$511

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 July 29, 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
Quickest round-trip

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 10/1

6:00 am-4:45 pm

1 stop7h 45m

London

Wed 10/7

6:10 am-12:00 pm

1 stop8h 50m

$336

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Fri 9/11

6:05 pm-5:20 am

1 stop8h 15m

London

Sun 9/13

6:10 am-4:00 pm

2 stops12h 50m

$341

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Wed 9/9

6:05 pm-5:20 am

1 stop8h 15m

London

Wed 9/16

6:10 am-12:25 pm

1 stop9h 15m

$348

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Thu 9/10

6:05 pm-5:20 am

1 stop8h 15m

London

Sun 9/13

6:10 am-4:00 pm

2 stops12h 50m

$351

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 9/10

12:07 pm-5:20 am

2 stops14h 13m

London

Thu 9/17

6:10 am-12:00 pm

1 stop8h 50m

$380

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 9/23

4:30 pm-9:20 am

2 stops13h 50m

London

Sat 9/26

5:40 am-12:34 pm

1 stop9h 54m

$411

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 8/27

11:00 am-5:20 am

2 stops15h 20m

London

Wed 9/9

6:10 am-12:00 pm

1 stop8h 50m

$421

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 9/23

1:35 pm-9:20 am

1 stop16h 45m

London

Sat 9/26

5:40 am-12:34 pm

1 stop9h 54m

$430

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 9/23

12:15 pm-9:20 am

2 stops18h 05m

London

Sat 9/26

5:40 am-12:34 pm

1 stop9h 54m

$430

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 10/1

6:00 am-4:45 pm

1 stop7h 45m

London

Wed 10/7

6:10 am-6:00 pm

2 stops14h 50m

$463

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

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 $355Free CancellationRating
7.2
3,415 reviews
Search WestJet flights
Air CanadaPriceFrom $358Free CancellationRating
7.1
11,405 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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