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Cheap flights from the United States to London from $156

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 7/31. 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
0 bags

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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
3:10 pm - 6:35 am
SEA
-
YXU
12h 25m
1 stop
WestJet Logo
8:00 am - 2:19 pm
YXU
-
SEA
9h 19m
1 stop
$302WestJet
Thu, Apr 16 - Thu, Apr 23
WestJet Logo
5:30 pm - 5:20 am
ORD
-
YXU
10h 50m
1 stop
WestJet Logo
6:10 am - 4:40 pm
YXU
-
ORD
11h 30m
1 stop
$306WestJet
Mon, May 25 - Thu, May 28
WestJet Logo
5:30 pm - 5:20 am
ORD
-
YXU
10h 50m
1 stop
WestJet Logo
6:10 am - 4:40 pm
YXU
-
ORD
11h 30m
1 stop
$325WestJet
Mon, May 25 - Thu, May 28
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
$346WestJet
Fri, Jul 10 - Tue, Jul 14
Air Canada Logo
4:15 pm - 8:44 am
SFO
-
YXU
13h 29m
1 stop
Air Canada Logo
9:25 am - 3:20 pm
YXU
-
SFO
8h 55m
1 stop
$385Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
1:20 pm - 8:44 am
SFO
-
YXU
16h 24m
2 stops
Air Canada Logo
5:10 am - 10:55 am
YXU
-
SFO
8h 45m
1 stop
$390Air Canada
Sat, Apr 11 - Wed, Apr 15
Multiple Airlines Logo
8:41 am - 6:35 am
SEA
-
YXU
18h 54m
2 stops
Multiple Airlines Logo
8:00 am - 2:19 pm
YXU
-
SEA
9h 19m
1 stop
$410Multiple Airlines
Thu, Apr 16 - Thu, Apr 23
Multiple Airlines Logo
7:56 pm - 6:35 am
ORD
-
YXU
33h 39m
2 stops
Multiple Airlines Logo
6:10 am - 4:40 pm
YXU
-
ORD
11h 30m
1 stop
$445Multiple Airlines
Mon, Apr 20 - Mon, Apr 27
United Airlines Logo
4:55 pm - 9:18 pm
CLT
-
YXU
4h 23m
1 stop
United Airlines Logo
9:25 am - 8:57 pm
YXU
-
CLT
11h 32m
2 stops
$768United Airlines
Mon, Mar 30 - Fri, Apr 3
United Airlines Logo
7:00 am - 5:03 pm
CLT
-
YXU
10h 03m
2 stops
United Airlines Logo
9:25 am - 8:57 pm
YXU
-
CLT
11h 32m
2 stops
$777United Airlines
Mon, Mar 30 - Fri, Apr 3

Air Canada flights from United States to London, Ontario

Our best Air Canada deals on United States to London, Ontario flight tickets
Air Canada
Apr 11
SFO4:15 pmSan Francisco
13h 29m
1 stop
YXU8:44 amLondon
Apr 15
YXU9:25 amLondon
8h 55m
1 stop
SFO3:20 pmSan Francisco
$385
Air Canada
Apr 11
SFO1:20 pmSan Francisco
16h 24m
2 stops
YXU8:44 amLondon
Apr 15
YXU5:10 amLondon
8h 45m
1 stop
SFO10:55 amSan Francisco
$390
Air Canada
Apr 11
SFO1:20 pmSan Francisco
16h 24m
2 stops
YXU8:44 amLondon
Apr 15
YXU5:10 amLondon
10h 20m
2 stops
SFO12:30 pmSan Francisco
$395

United Airlines flights from United States to London, Ontario

Our best United Airlines deals on United States to London, Ontario flight tickets
United Airlines
Apr 17
SFO6:55 pmSan Francisco
19h 09m
2 stops
YXU5:04 pmLondon
Apr 24
YXU9:25 amLondon
8h 55m
1 stop
SFO3:20 pmSan Francisco
$467
United Airlines
Apr 17
SFO2:30 pmSan Francisco
15h 14m
1 stop
YXU8:44 amLondon
Apr 24
YXU5:10 amLondon
8h 45m
1 stop
SFO10:55 amSan Francisco
$482
United Airlines
Apr 16
SFO2:30 pmSan Francisco
15h 14m
1 stop
YXU8:44 amLondon
Apr 23
YXU5:10 amLondon
19h 24m
3 stops
SFO9:34 pmSan Francisco
$492

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 March 6, 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

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 4/16

3:10 pm-6:35 am

1 stop12h 25m

London

Thu 4/23

8:00 am-2:19 pm

1 stop9h 19m

$302

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 5/25

5:30 pm-5:20 am

1 stop10h 50m

London

Thu 5/28

6:10 am-4:40 pm

1 stop11h 30m

$306

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 5/25

5:30 pm-5:20 am

1 stop10h 50m

London

Thu 5/28

6:10 am-4:40 pm

1 stop11h 30m

$325

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Fri 7/10

6:05 pm-5:20 am

1 stop8h 15m

London

Tue 7/14

6:10 am-12:00 pm

1 stop8h 50m

$346

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 4/11

4:15 pm-8:44 am

1 stop13h 29m

London

Wed 4/15

9:25 am-3:20 pm

1 stop8h 55m

$385

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 4/11

1:20 pm-8:44 am

2 stops16h 24m

London

Wed 4/15

5:10 am-10:55 am

1 stop8h 45m

$390

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 4/16

8:41 am-6:35 am

2 stops18h 54m

London

Thu 4/23

8:00 am-2:19 pm

1 stop9h 19m

$410

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 4/20

7:56 pm-6:35 am

2 stops33h 39m

London

Mon 4/27

6:10 am-4:40 pm

1 stop11h 30m

$445
Quickest round-trip

CharlotteLondon

CLT - YXU

CLTYXU

Charlotte Douglas

Mon 3/30

4:55 pm-9:18 pm

1 stop4h 23m

London

Fri 4/3

9:25 am-8:57 pm

2 stops11h 32m

$768

CharlotteLondon

CLT - YXU

CLTYXU

Charlotte Douglas

Mon 3/30

7:00 am-5:03 pm

2 stops10h 03m

London

Fri 4/3

9:25 am-8:57 pm

2 stops11h 32m

$777

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 United States to London flight route?

Fly from Orlando to London for the best United States - London flight prices

What cabin class options are available on United States to London flights?

There is only 1 cabin class available to choose from on United States to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

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

No. A direct flight is the cheapest option for a flight between United States to London, Ontario.

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

4h 00m

Direct flights

None
The fastest flight from United States to London, Ontario takes 4h 00m
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

  • 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.

  • What is the most popular plane model from United States to London, Ontario?

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
Air CanadaPriceFrom $254Free CancellationRating
7.1
10,785 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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