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Cheap flights from the United States to London from $170

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 1/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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 46m2 stops
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m1 stop
$273Air Canada
Thu, Jan 29 - Sun, Feb 1
WestJet Logo
5:30 pm - 5:12 am
ORD
-
YXU
10h 42m1 stop
WestJet Logo
8:00 pm - 4:43 pm
YXU
-
ORD
21h 43m1 stop
$278WestJet
Mon, May 25 - Thu, May 28
WestJet Logo
5:30 pm - 5:12 am
ORD
-
YXU
10h 42m1 stop
WestJet Logo
8:00 pm - 4:43 pm
YXU
-
ORD
21h 43m1 stop
$283WestJet
Mon, May 25 - Thu, May 28
Air Canada Logo
8:10 am - 9:21 pm
SEA
-
YXU
10h 11m1 stop
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m1 stop
$292Air Canada
Thu, Jan 29 - Sun, Feb 1
Air Canada Logo
5:50 am - 9:21 pm
SEA
-
YXU
12h 31m2 stops
Air Canada Logo
5:10 am - 10:06 pm
YXU
-
SEA
19h 56m2 stops
$297Air Canada
Thu, Jan 29 - Sun, Feb 1
WestJet Logo
6:20 pm - 6:35 am
IAH
-
YXU
11h 15m1 stop
WestJet Logo
8:00 pm - 2:10 pm
YXU
-
IAH
19h 10m1 stop
$307WestJet
Mon, Apr 20 - Mon, Apr 27
WestJet Logo
5:30 pm - 5:12 am
ORD
-
YXU
10h 42m1 stop
WestJet Logo
8:00 pm - 4:43 pm
YXU
-
ORD
21h 43m1 stop
$369WestJet
Mon, May 25 - Thu, May 28
Multiple Airlines Logo
5:30 pm - 6:34 am
MCO
-
YXU
13h 04m1 stop
Multiple Airlines Logo
8:10 pm - 10:48 am
YXU
-
MCO
14h 38m2 stops
$385Multiple Airlines
Tue, Jan 27 - Mon, Feb 2
United Airlines Logo
11:35 pm - 5:05 pm
SEA
-
YXU
14h 30m2 stops
United Airlines Logo
9:25 am - 8:56 pm
YXU
-
SEA
14h 31m2 stops
$400United Airlines
Sat, Feb 14 - Sat, Feb 21
United Airlines Logo
12:57 pm - 5:05 pm
SEA
-
YXU
25h 08m3 stops
United Airlines Logo
5:10 am - 10:43 pm
YXU
-
SEA
20h 33m2 stops
$406United Airlines
Thu, Jan 29 - Sun, Feb 1

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 29
SEA8:00 pmSeattle/Tacoma Intl
9h 46m
2 stops
YXU8:46 amLondon
Feb 1
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$273
Find similar
Air Canada
Jan 29
SEA8:10 amSeattle/Tacoma Intl
10h 11m
1 stop
YXU9:21 pmLondon
Feb 1
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$292
Find similar
Air Canada
Jan 29
SEA5:50 amSeattle/Tacoma Intl
12h 31m
2 stops
YXU9:21 pmLondon
Feb 1
YXU5:10 amLondon
19h 56m
2 stops
SEA10:06 pmSeattle/Tacoma Intl
$297
Find similar

United Airlines flights from United States to London, Ontario

Our best United Airlines deals on United States to London, Ontario flight tickets
United Airlines
Feb 14
SEA11:35 pmSeattle/Tacoma Intl
14h 30m
2 stops
YXU5:05 pmLondon
Feb 21
YXU9:25 amLondon
14h 31m
2 stops
SEA8:56 pmSeattle/Tacoma Intl
$400
Find similar
United Airlines
Jan 29
SEA12:57 pmSeattle/Tacoma Intl
25h 08m
3 stops
YXU5:05 pmLondon
Feb 1
YXU5:10 amLondon
20h 33m
2 stops
SEA10:43 pmSeattle/Tacoma Intl
$406
Find similar
United Airlines
Feb 14
SEA12:42 pmSeattle/Tacoma Intl
29h 39m
3 stops
YXU9:21 pmLondon
Feb 21
YXU9:25 amLondon
14h 31m
2 stops
SEA8:56 pmSeattle/Tacoma Intl
$429
Find similar

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 2, 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

Thu 1/29

8:00 pm-8:46 am

2 stops9h 46m

London

Sun 2/1

5:40 pm-10:16 pm

1 stop7h 36m

$273

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

$278

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

$283

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/29

8:10 am-9:21 pm

1 stop10h 11m

London

Sun 2/1

5:40 pm-10:16 pm

1 stop7h 36m

$292

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/29

5:50 am-9:21 pm

2 stops12h 31m

London

Sun 2/1

5:10 am-10:06 pm

2 stops19h 56m

$297

HoustonLondon

IAH - YXU

IAHYXU

Houston George Bush Intcntl

Mon 4/20

6:20 pm-6:35 am

1 stop11h 15m

London

Mon 4/27

8:00 pm-2:10 pm

1 stop19h 10m

$307

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

$369

OrlandoLondon

MCO - YXU

MCOYXU

Orlando

Tue 1/27

5:30 pm-6:34 am

1 stop13h 04m

London

Mon 2/2

8:10 pm-10:48 am

2 stops14h 38m

$385

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Sat 2/14

11:35 pm-5:05 pm

2 stops14h 30m

London

Sat 2/21

9:25 am-8:56 pm

2 stops14h 31m

$400

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/29

12:57 pm-5:05 pm

3 stops25h 08m

London

Sun 2/1

5:10 am-10:43 pm

2 stops20h 33m

$406

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

3h 57m

Direct flights

None
The fastest flight from United States to London, Ontario takes 3h 57m
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
3,230 reviews
Search WestJet flights
Air CanadaPriceFrom $178Free CancellationRating
7.1
10,574 reviews
Search Air Canada flights
United AirlinesPriceFrom $186Free CancellationRating
7.4
9,132 reviews
Search United Airlines 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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