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Cheap flights from the United States to London from $142

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 2/19. 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
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
5:10 am - 10:45 am
YXU
-
SFO
8h 35m
1 stop
$401Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
5:10 am - 3:32 pm
YXU
-
SFO
13h 22m
2 stops
$406Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
7:25 am - 9:18 pm
SFO
-
YXU
10h 53m
2 stops
Air Canada Logo
5:10 am - 12:32 pm
YXU
-
SFO
10h 22m
2 stops
$411Air Canada
Sat, Apr 11 - Wed, Apr 15
Air Canada Logo
8:30 am - 9:18 pm
SFO
-
YXU
9h 48m
1 stop
Air Canada Logo
6:00 am - 10:50 am
YXU
-
SFO
7h 50m
1 stop
$428Air Canada
Wed, Apr 29 - Sun, May 3
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
$480WestJet
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
$485WestJet
Mon, May 25 - Thu, May 28
Multiple Airlines Logo
7:40 am - 6:13 pm
LGA
-
YXU
34h 33m
3 stops
Multiple Airlines Logo
5:10 am - 9:18 am
YXU
-
LGA
4h 08m
1 stop
$572Multiple Airlines
Sat, Mar 7 - Sat, Mar 14
Multiple Airlines Logo
3:10 pm - 6:35 am
SEA
-
YXU
12h 25m
1 stop
Multiple Airlines Logo
8:10 pm - 7:57 pm
YXU
-
SEA
26h 47m
1 stop
$584Multiple Airlines
Thu, Mar 5 - Thu, Mar 12
United Airlines Logo
1:05 pm - 5:05 pm
LGA
-
YXU
4h 00m
1 stop
United Airlines Logo
5:10 am - 10:43 am
YXU
-
LGA
5h 33m
1 stop
$660United Airlines
Thu, Mar 5 - Thu, Mar 12
United Airlines Logo
4:50 pm - 9:21 pm
JFK
-
YXU
4h 31m
1 stop
United Airlines Logo
5:40 pm - 10:39 pm
YXU
-
JFK
4h 59m
1 stop
$660United Airlines
Thu, Mar 5 - Thu, Mar 12

WestJet flights from United States to London, Ontario

Our best WestJet deals on United States to London, Ontario flight tickets
WestJet
May 25
ORD5:30 pmChicago O'Hare Intl
10h 42m
1 stop
YXU5:12 amLondon
May 28
YXU8:00 pmLondon
21h 43m
1 stop
ORD4:43 pmChicago O'Hare Intl
$480
WestJet
May 25
ORD5:30 pmChicago O'Hare Intl
10h 42m
1 stop
YXU5:12 amLondon
May 28
YXU8:00 pmLondon
21h 43m
1 stop
ORD4:43 pmChicago O'Hare Intl
$485
WestJet
Mar 18
SFO5:01 pmSan Francisco
10h 34m
2 stops
YXU6:35 amLondon
Mar 22
YXU8:10 pmLondon
26h 50m
2 stops
SFO8:00 pmSan Francisco
$834

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
SFO8:30 amSan Francisco
9h 48m
1 stop
YXU9:18 pmLondon
Apr 15
YXU5:10 amLondon
8h 35m
1 stop
SFO10:45 amSan Francisco
$401
Air Canada
Apr 11
SFO8:30 amSan Francisco
9h 48m
1 stop
YXU9:18 pmLondon
Apr 15
YXU5:10 amLondon
10h 22m
2 stops
SFO12:32 pmSan Francisco
$406
Air Canada
Apr 11
SFO7:25 amSan Francisco
10h 53m
2 stops
YXU9:18 pmLondon
Apr 15
YXU5:10 amLondon
10h 22m
2 stops
SFO12:32 pmSan Francisco
$411

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 21, 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

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 4/11

8:30 am-9:18 pm

1 stop9h 48m

London

Wed 4/15

5:10 am-10:45 am

1 stop8h 35m

$401

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 4/11

8:30 am-9:18 pm

1 stop9h 48m

London

Wed 4/15

5:10 am-3:32 pm

2 stops13h 22m

$406

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 4/11

7:25 am-9:18 pm

2 stops10h 53m

London

Wed 4/15

5:10 am-12:32 pm

2 stops10h 22m

$411

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 4/29

8:30 am-9:18 pm

1 stop9h 48m

London

Sun 5/3

6:00 am-10:50 am

1 stop7h 50m

$428

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

$480

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

$485

New YorkLondon

LGA - YXU

LGAYXU

New York LaGuardia

Sat 3/7

7:40 am-6:13 pm

3 stops34h 33m

London

Sat 3/14

5:10 am-9:18 am

1 stop4h 08m

$572

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 3/5

3:10 pm-6:35 am

1 stop12h 25m

London

Thu 3/12

8:10 pm-7:57 pm

1 stop26h 47m

$584

New YorkLondon

LGA - YXU

LGAYXU

New York LaGuardia

Thu 3/5

1:05 pm-5:05 pm

1 stop4h 00m

London

Thu 3/12

5:10 am-10:43 am

1 stop5h 33m

$660

New YorkLondon

JFK - YXU

JFKYXU

New York John F Kennedy Intl

Thu 3/5

4:50 pm-9:21 pm

1 stop4h 31m

London

Thu 3/12

5:40 pm-10:39 pm

1 stop4h 59m

$660

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 $145Free CancellationRating
7.1
10,644 reviews
Search Air Canada flights
WestJetPriceFrom $162Free CancellationRating
7.2
3,247 reviews
Search WestJet flights
United AirlinesPriceFrom $183Free CancellationRating
7.4
9,188 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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