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Cheap flights from the United States to London from $141

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 2/10. 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
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.
Air Canada Logo
8:00 pm - 8:46 am
SEA
-
YXU
9h 46m
2 stops
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m
1 stop
$276Air Canada
Wed, Jan 28 - Wed, Feb 4
Air Canada Logo
8:00 pm - 8:46 am
SEA
-
YXU
9h 46m
2 stops
Air Canada Logo
5:10 am - 2:31 pm
YXU
-
SEA
12h 21m
2 stops
$281Air Canada
Wed, Jan 28 - Wed, Feb 4
Air Canada Logo
8:10 am - 9:21 pm
SEA
-
YXU
10h 11m
1 stop
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m
1 stop
$295Air Canada
Thu, Feb 26 - Thu, Mar 5
Air Canada Logo
9:55 am - 8:46 am
SEA
-
YXU
19h 51m
2 stops
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m
1 stop
$301Air Canada
Thu, Jan 29 - Sun, Feb 1
WestJet Logo
5:30 pm - 5:12 am
ORD
-
YXU
10h 42m
1 stop
WestJet Logo
8:00 pm - 4:43 pm
YXU
-
ORD
21h 43m
1 stop
$324WestJet
Mon, May 25 - Thu, May 28
WestJet Logo
5:30 pm - 5:12 am
ORD
-
YXU
10h 42m
1 stop
WestJet Logo
8:00 pm - 4:43 pm
YXU
-
ORD
21h 43m
1 stop
$353WestJet
Mon, May 25 - Thu, May 28
Multiple Airlines Logo
3:10 pm - 6:35 am
SEA
-
YXU
12h 25m
1 stop
Multiple Airlines Logo
8:10 pm - 9:22 am
YXU
-
SEA
40h 12m
2 stops
$368Multiple Airlines
Mon, Feb 9 - Mon, Feb 16
Multiple Airlines Logo
8:59 am - 6:35 am
ORD
-
YXU
20h 36m
2 stops
Multiple Airlines Logo
8:10 pm - 1:35 pm
YXU
-
ORD
18h 25m
1 stop
$426Multiple Airlines
Thu, Feb 26 - Thu, Mar 5
United Airlines Logo
8:30 am - 9:21 pm
SFO
-
YXU
9h 51m
1 stop
United Airlines Logo
5:10 am - 10:54 am
YXU
-
SFO
8h 44m
1 stop
$431United Airlines
Thu, Feb 26 - Thu, Mar 5
United Airlines Logo
8:30 am - 9:21 pm
SFO
-
YXU
9h 51m
1 stop
United Airlines Logo
9:25 am - 12:16 am
YXU
-
SFO
17h 51m
2 stops
$446United Airlines
Thu, Feb 26 - Thu, Mar 5

United Airlines flights from United States to London, Ontario

Our best United Airlines deals on United States to London, Ontario flight tickets
United Airlines
Jan 29
SEA12:57 pmSeattle/Tacoma Intl
25h 08m
3 stops
YXU5:05 pmLondon
Feb 1
YXU9:50 amLondon
15h 53m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$387
United Airlines
Feb 26
SFO8:30 amSan Francisco
9h 51m
1 stop
YXU9:21 pmLondon
Mar 5
YXU5:10 amLondon
8h 44m
1 stop
SFO10:54 amSan Francisco
$431
United Airlines
Feb 26
SFO8:30 amSan Francisco
9h 51m
1 stop
YXU9:21 pmLondon
Mar 5
YXU9:25 amLondon
17h 51m
2 stops
SFO12:16 amSan Francisco
$446

Air Canada flights from United States to London, Ontario

Our best Air Canada deals on United States to London, Ontario flight tickets
Air Canada
Jan 28
SEA8:00 pmSeattle/Tacoma Intl
9h 46m
2 stops
YXU8:46 amLondon
Feb 4
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$276
Air Canada
Jan 28
SEA8:00 pmSeattle/Tacoma Intl
9h 46m
2 stops
YXU8:46 amLondon
Feb 4
YXU5:10 amLondon
12h 21m
2 stops
SEA2:31 pmSeattle/Tacoma Intl
$281
Air Canada
Feb 26
SEA8:10 amSeattle/Tacoma Intl
10h 11m
1 stop
YXU9:21 pmLondon
Mar 5
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$295

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 January 14, 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

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 1/28

8:00 pm-8:46 am

2 stops9h 46m

London

Wed 2/4

5:40 pm-10:16 pm

1 stop7h 36m

$276

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 1/28

8:00 pm-8:46 am

2 stops9h 46m

London

Wed 2/4

5:10 am-2:31 pm

2 stops12h 21m

$281

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 2/26

8:10 am-9:21 pm

1 stop10h 11m

London

Thu 3/5

5:40 pm-10:16 pm

1 stop7h 36m

$295

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/29

9:55 am-8:46 am

2 stops19h 51m

London

Sun 2/1

5:40 pm-10:16 pm

1 stop7h 36m

$301

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 5/25

5:30 pm-5:12 am

1 stop10h 42m

London

Thu 5/28

8:00 pm-4:43 pm

1 stop21h 43m

$324

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Mon 5/25

5:30 pm-5:12 am

1 stop10h 42m

London

Thu 5/28

8:00 pm-4:43 pm

1 stop21h 43m

$353

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 2/9

3:10 pm-6:35 am

1 stop12h 25m

London

Mon 2/16

8:10 pm-9:22 am

2 stops40h 12m

$368

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Thu 2/26

8:59 am-6:35 am

2 stops20h 36m

London

Thu 3/5

8:10 pm-1:35 pm

1 stop18h 25m

$426

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 2/26

8:30 am-9:21 pm

1 stop9h 51m

London

Thu 3/5

5:10 am-10:54 am

1 stop8h 44m

$431

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Thu 2/26

8:30 am-9:21 pm

1 stop9h 51m

London

Thu 3/5

9:25 am-12:16 am

2 stops17h 51m

$446

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 02m

Direct flights

None
The fastest flight from United States to London, Ontario takes 4h 02m
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
WestJetPriceFrom $162Free CancellationRating
7.2
3,240 reviews
Search WestJet flights
United AirlinesPriceFrom $192Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights
Air CanadaPriceFrom $210Free CancellationRating
7.1
10,619 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.

An easier way to manage your London, Ontario trip

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