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Cheap flights from the United States to London from $228

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 4/23. 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
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
5:55 pm - 9:40 am
YXU
-
SEA
18h 45m
1 stop
$359WestJet
Tue, May 19 - Tue, May 26
WestJet Logo
7:35 pm - 5:20 am
SEA
-
YXU
6h 45m
1 stop
WestJet Logo
6:10 am - 6:45 pm
YXU
-
SEA
15h 35m
1 stop
$433WestJet
Wed, Apr 29 - Sun, May 3
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 2:05 pm
YXU
-
LAX
10h 55m
1 stop
$451WestJet
Sat, May 16 - Sat, May 23
WestJet Logo
6:05 pm - 5:20 am
LAX
-
YXU
8h 15m
1 stop
WestJet Logo
6:10 am - 5:10 pm
YXU
-
LAX
14h 00m
1 stop
$462WestJet
Wed, Apr 29 - Wed, May 6
Multiple Airlines Logo
2:23 pm - 5:20 am
DEN
-
YXU
12h 57m
2 stops
Multiple Airlines Logo
5:55 pm - 11:20 am
YXU
-
DEN
19h 25m
1 stop
$507Multiple Airlines
Tue, May 19 - Fri, May 22
Air Canada Logo
5:50 am - 9:38 pm
SEA
-
YXU
12h 48m
2 stops
Air Canada Logo
3:30 pm - 9:08 pm
YXU
-
SEA
8h 38m
1 stop
$513Air Canada
Mon, Jun 1 - Fri, Jun 5
Air Canada Logo
6:59 am - 11:43 am
JFK
-
YXU
4h 44m
1 stop
Air Canada Logo
6:10 pm - 10:48 pm
YXU
-
JFK
4h 38m
1 stop
$516Air Canada
Sat, May 16 - Sat, May 23
Multiple Airlines Logo
2:25 pm - 5:20 am
EWR
-
YXU
14h 55m
1 stop
Multiple Airlines Logo
6:10 pm - 10:35 pm
YXU
-
EWR
4h 25m
1 stop
$519Multiple Airlines
Fri, May 8 - Sun, May 17
United Airlines Logo
11:00 am - 2:58 pm
DCA
-
YXU
3h 58m
1 stop
United Airlines Logo
5:10 am - 8:53 am
YXU
-
DCA
3h 43m
1 stop
$701United Airlines
Fri, Jun 12 - Wed, Jun 17
United Airlines Logo
6:59 am - 11:43 am
DCA
-
YXU
4h 44m
1 stop
United Airlines Logo
9:30 am - 5:25 pm
YXU
-
DCA
7h 55m
2 stops
$716United Airlines
Fri, May 1 - Fri, May 8

Air Canada flights from United States to London, Ontario

Our best Air Canada deals on United States to London, Ontario flight tickets
Air Canada
Jun 1
SEA5:50 amSeattle/Tacoma Intl
12h 48m
2 stops
YXU9:38 pmLondon
Jun 5
YXU3:30 pmLondon
8h 38m
1 stop
SEA9:08 pmSeattle/Tacoma Intl
$513
Air Canada
May 16
JFK6:59 amNew York John F Kennedy Intl
4h 44m
1 stop
YXU11:43 amLondon
May 23
YXU6:10 pmLondon
4h 38m
1 stop
JFK10:48 pmNew York John F Kennedy Intl
$516
Air Canada
May 16
EWR6:35 amNewark
5h 08m
1 stop
YXU11:43 amLondon
May 23
YXU5:10 amLondon
5h 10m
1 stop
EWR10:20 amNewark
$517

United Airlines flights from United States to London, Ontario

Our best United Airlines deals on United States to London, Ontario flight tickets
United Airlines
Jun 5
LAX7:21 pmLos Angeles Los Angeles
16h 37m
2 stops
YXU2:58 pmLondon
Jun 6
YXU6:10 pmLondon
16h 19m
2 stops
LAX7:29 amLos Angeles Los Angeles
$629
United Airlines
Jun 5
LAX7:21 pmLos Angeles Los Angeles
16h 37m
2 stops
YXU2:58 pmLondon
Jun 6
YXU6:10 pmLondon
16h 19m
2 stops
LAX7:29 amLos Angeles Los Angeles
$630
United Airlines
May 15
MCO12:34 pmOrlando
9h 04m
2 stops
YXU9:38 pmLondon
May 22
YXU12:20 pmLondon
7h 25m
2 stops
MCO7:45 pmOrlando
$642

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 April 5, 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

Tue 5/19

7:35 pm-5:20 am

1 stop6h 45m

London

Tue 5/26

5:55 pm-9:40 am

1 stop18h 45m

$359

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 4/29

7:35 pm-5:20 am

1 stop6h 45m

London

Sun 5/3

6:10 am-6:45 pm

1 stop15h 35m

$433

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles Los Angeles

Sat 5/16

6:05 pm-5:20 am

1 stop8h 15m

London

Sat 5/23

6:10 am-2:05 pm

1 stop10h 55m

$451

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles Los Angeles

Wed 4/29

6:05 pm-5:20 am

1 stop8h 15m

London

Wed 5/6

6:10 am-5:10 pm

1 stop14h 00m

$462

DenverLondon

DEN - YXU

DENYXU

Denver Intl

Tue 5/19

2:23 pm-5:20 am

2 stops12h 57m

London

Fri 5/22

5:55 pm-11:20 am

1 stop19h 25m

$507

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 6/1

5:50 am-9:38 pm

2 stops12h 48m

London

Fri 6/5

3:30 pm-9:08 pm

1 stop8h 38m

$513

New YorkLondon

JFK - YXU

JFKYXU

New York John F Kennedy Intl

Sat 5/16

6:59 am-11:43 am

1 stop4h 44m

London

Sat 5/23

6:10 pm-10:48 pm

1 stop4h 38m

$516

NewarkLondon

EWR - YXU

EWRYXU

Newark

Fri 5/8

2:25 pm-5:20 am

1 stop14h 55m

London

Sun 5/17

6:10 pm-10:35 pm

1 stop4h 25m

$519
Quickest round-trip

Washington, D.C.London

DCA - YXU

DCAYXU

Washington, D.C. Reagan-National

Fri 6/12

11:00 am-2:58 pm

1 stop3h 58m

London

Wed 6/17

5:10 am-8:53 am

1 stop3h 43m

$701

Washington, D.C.London

DCA - YXU

DCAYXU

Washington, D.C. Reagan-National

Fri 5/1

6:59 am-11:43 am

1 stop4h 44m

London

Fri 5/8

9:30 am-5:25 pm

2 stops7h 55m

$716

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?

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 58m

Direct flights

None
The fastest flight from United States to London, Ontario takes 3h 58m
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.

  • 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 $210Free CancellationRating
7.1
10,894 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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