Latest deals
Insights
FAQs
Reviews
Price Alerts

Cheap flights from the United States to London from $149

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 7/28. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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 - 6:45 pm
YXU
-
SEA
27h 50m
1 stop
$276WestJet
Tue, Jun 30 - Tue, Jul 7
WestJet Logo
6:00 am - 4:45 pm
SFO
-
YXU
7h 45m
1 stop
WestJet Logo
6:10 am - 12:00 pm
YXU
-
SFO
8h 50m
1 stop
$290WestJet
Mon, Oct 12 - Wed, Oct 21
Air Canada Logo
7:10 am - 9:40 pm
SFO
-
YXU
11h 30m
2 stops
Air Canada Logo
5:40 am - 10:39 am
YXU
-
SFO
7h 59m
1 stop
$337Air Canada
Sun, Oct 11 - Wed, Oct 21
Air Canada Logo
8:10 am - 9:40 pm
SFO
-
YXU
10h 30m
2 stops
Air Canada Logo
5:40 am - 10:39 am
YXU
-
SFO
7h 59m
1 stop
$358Air Canada
Tue, Sep 8 - Fri, Sep 11
Multiple Airlines Logo
2:47 pm - 5:20 am
DEN
-
YXU
12h 33m
2 stops
Multiple Airlines Logo
5:55 pm - 11:20 am
YXU
-
DEN
19h 25m
1 stop
$607Multiple Airlines
Sat, Jun 13 - Thu, Jun 18
Multiple Airlines Logo
10:05 am - 1:50 pm
BOS
-
YXU
27h 45m
2 stops
Multiple Airlines Logo
6:10 am - 10:20 pm
YXU
-
BOS
16h 10m
1 stop
$608Multiple Airlines
Thu, Jun 11 - Wed, Jun 17
Delta Logo
11:33 am - 5:20 am
SJC
-
YXU
14h 47m
2 stops
Delta Logo
6:10 am - 6:48 pm
YXU
-
SJC
15h 38m
2 stops
$720Delta
Mon, Oct 12 - Wed, Oct 21
Delta Logo
11:33 am - 5:20 am
SJC
-
YXU
14h 47m
2 stops
Delta Logo
6:10 am - 6:48 pm
YXU
-
SJC
15h 38m
2 stops
$721Delta
Mon, Oct 12 - Wed, Oct 21
United Airlines Logo
8:45 am - 5:43 pm
ORD
-
YXU
7h 58m
2 stops
United Airlines Logo
10:05 am - 2:55 pm
YXU
-
ORD
5h 50m
1 stop
$746United Airlines
Tue, Sep 8 - Sat, Sep 12
United Airlines Logo
10:50 am - 9:40 pm
ORD
-
YXU
9h 50m
2 stops
United Airlines Logo
3:30 pm - 11:40 pm
YXU
-
ORD
9h 10m
2 stops
$761United Airlines
Tue, Sep 8 - Sat, Sep 12

Air Canada flights from United States to London, Ontario

Our best Air Canada deals on United States to London, Ontario flight tickets
Air Canada
Oct 11
SFO7:10 amSan Francisco
11h 30m
2 stops
YXU9:40 pmLondon
Oct 21
YXU5:40 amLondon
7h 59m
1 stop
SFO10:39 amSan Francisco
$337
Air Canada
Sep 8
SFO8:10 amSan Francisco
10h 30m
2 stops
YXU9:40 pmLondon
Sep 11
YXU5:40 amLondon
7h 59m
1 stop
SFO10:39 amSan Francisco
$358
Air Canada
Oct 11
SFO4:35 pmSan Francisco
13h 45m
2 stops
YXU9:20 amLondon
Oct 21
YXU6:20 pmLondon
20h 47m
2 stops
SFO12:07 pmSan Francisco
$372

WestJet flights from United States to London, Ontario

Our best WestJet deals on United States to London, Ontario flight tickets
WestJet
Jun 30
SEA7:35 pmSeattle/Tacoma Intl
6h 45m
1 stop
YXU5:20 amLondon
Jul 7
YXU5:55 pmLondon
27h 50m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
$276
WestJet
Oct 12
SFO6:00 amSan Francisco
7h 45m
1 stop
YXU4:45 pmLondon
Oct 21
YXU6:10 amLondon
8h 50m
1 stop
SFO12:00 pmSan Francisco
$290
WestJet
Aug 9
SEA7:00 amSeattle/Tacoma Intl
6h 45m
1 stop
YXU4:45 pmLondon
Aug 22
YXU5:55 pmLondon
27h 50m
1 stop
SEA6:45 pmSeattle/Tacoma Intl
$307

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 May 17, 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 6/30

7:35 pm-5:20 am

1 stop6h 45m

London

Tue 7/7

5:55 pm-6:45 pm

1 stop27h 50m

$276

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 10/12

6:00 am-4:45 pm

1 stop7h 45m

London

Wed 10/21

6:10 am-12:00 pm

1 stop8h 50m

$290

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 10/11

7:10 am-9:40 pm

2 stops11h 30m

London

Wed 10/21

5:40 am-10:39 am

1 stop7h 59m

$337

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Tue 9/8

8:10 am-9:40 pm

2 stops10h 30m

London

Fri 9/11

5:40 am-10:39 am

1 stop7h 59m

$358

DenverLondon

DEN - YXU

DENYXU

Denver Intl

Sat 6/13

2:47 pm-5:20 am

2 stops12h 33m

London

Thu 6/18

5:55 pm-11:20 am

1 stop19h 25m

$607

BostonLondon

BOS - YXU

BOSYXU

Boston Logan Intl

Thu 6/11

10:05 am-1:50 pm

2 stops27h 45m

London

Wed 6/17

6:10 am-10:20 pm

1 stop16h 10m

$608

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Mon 10/12

11:33 am-5:20 am

2 stops14h 47m

London

Wed 10/21

6:10 am-6:48 pm

2 stops15h 38m

$720

San JoseLondon

SJC - YXU

SJCYXU

San Jose

Mon 10/12

11:33 am-5:20 am

2 stops14h 47m

London

Wed 10/21

6:10 am-6:48 pm

2 stops15h 38m

$721
Quickest round-trip

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Tue 9/8

8:45 am-5:43 pm

2 stops7h 58m

London

Sat 9/12

10:05 am-2:55 pm

1 stop5h 50m

$746

ChicagoLondon

ORD - YXU

ORDYXU

Chicago O'Hare Intl

Tue 9/8

10:50 am-9:40 pm

2 stops9h 50m

London

Sat 9/12

3:30 pm-11:40 pm

2 stops9h 10m

$761

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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?

You could potentially save up to 27% on your flight if you consider stops on a United States to London, Ontario flight.

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 55m

Direct flights

None
The fastest flight from United States to London, Ontario takes 3h 55m
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
WestJetPriceFrom $162Free CancellationRating
7.2
3,336 reviews
Search WestJet flights
Air CanadaPriceFrom $210Free CancellationRating
7.1
11,055 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

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 6/16
Tue 6/23
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Canada