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Cheap flights from the United States to London from $147

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 1/13. 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 46m2 stops
Air Canada Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m1 stop
$283Air Canada
Thu, Jan 22 - Mon, Jan 26
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
$301Air Canada
Thu, Jan 22 - Mon, Jan 26
Air Canada Logo
8:00 pm - 8:46 am
SEA
-
YXU
9h 46m2 stops
Air Canada Logo
5:40 pm - 9:31 am
YXU
-
SEA
18h 51m2 stops
$307Air Canada
Thu, Jan 22 - Mon, Jan 26
Multiple Airlines Logo
7:00 am - 6:34 am
LAX
-
YXU
20h 34m1 stop
Multiple Airlines Logo
8:10 pm - 2:02 pm
YXU
-
LAX
44h 52m2 stops
$343Multiple Airlines
Thu, Jan 22 - Thu, Jan 29
WestJet Logo
11:50 am - 6:34 am
LAX
-
YXU
15h 44m2 stops
WestJet Logo
8:10 pm - 11:00 am
YXU
-
LAX
17h 50m2 stops
$345WestJet
Thu, Jan 22 - Thu, Jan 29
WestJet Logo
7:00 am - 6:34 am
LAX
-
YXU
20h 34m1 stop
WestJet Logo
8:10 pm - 10:03 pm
YXU
-
LAX
28h 53m1 stop
$347WestJet
Thu, Jan 22 - Thu, Jan 29
WestJet Logo
12:15 pm - 7:12 pm
LAX
-
YXU
27h 57m1 stop
WestJet Logo
8:10 pm - 11:00 am
YXU
-
LAX
17h 50m2 stops
$351WestJet
Sat, Jan 24 - Mon, Jan 26
Multiple Airlines Logo
2:08 pm - 6:34 am
SFO
-
YXU
13h 26m2 stops
Multiple Airlines Logo
8:10 pm - 12:12 pm
YXU
-
SFO
19h 02m1 stop
$372Multiple Airlines
Wed, Jan 21 - Wed, Jan 28
United Airlines Logo
7:00 am - 9:21 pm
SEA
-
YXU
11h 21m2 stops
United Airlines Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m1 stop
$373United Airlines
Wed, Jan 21 - Wed, Jan 28
United Airlines Logo
8:10 am - 9:21 pm
SEA
-
YXU
10h 11m1 stop
United Airlines Logo
5:40 pm - 10:16 pm
YXU
-
SEA
7h 36m1 stop
$387United Airlines
Wed, Jan 21 - Wed, Jan 28

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 22
SEA8:00 pmSeattle/Tacoma Intl
9h 46m
2 stops
YXU8:46 amLondon
Jan 26
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$283
Find similar
Air Canada
Jan 22
SEA8:10 amSeattle/Tacoma Intl
10h 11m
1 stop
YXU9:21 pmLondon
Jan 26
YXU5:40 pmLondon
7h 36m
1 stop
SEA10:16 pmSeattle/Tacoma Intl
$301
Find similar
Air Canada
Jan 22
SEA8:00 pmSeattle/Tacoma Intl
9h 46m
2 stops
YXU8:46 amLondon
Jan 26
YXU5:40 pmLondon
18h 51m
2 stops
SEA9:31 amSeattle/Tacoma Intl
$307
Find similar

WestJet flights from United States to London, Ontario

Our best WestJet deals on United States to London, Ontario flight tickets
WestJet
Jan 22
LAX11:50 amLos Angeles
15h 44m
2 stops
YXU6:34 amLondon
Jan 29
YXU8:10 pmLondon
17h 50m
2 stops
LAX11:00 amLos Angeles
$345
Find similar
WestJet
Jan 22
LAX7:00 amLos Angeles
20h 34m
1 stop
YXU6:34 amLondon
Jan 29
YXU8:10 pmLondon
28h 53m
1 stop
LAX10:03 pmLos Angeles
$347
Find similar
WestJet
Jan 24
LAX12:15 pmLos Angeles
27h 57m
1 stop
YXU7:12 pmLondon
Jan 26
YXU8:10 pmLondon
17h 50m
2 stops
LAX11:00 amLos Angeles
$351
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 December 8, 2025.
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 1/22

8:00 pm-8:46 am

2 stops9h 46m

London

Mon 1/26

5:40 pm-10:16 pm

1 stop7h 36m

$283

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/22

8:10 am-9:21 pm

1 stop10h 11m

London

Mon 1/26

5:40 pm-10:16 pm

1 stop7h 36m

$301

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Thu 1/22

8:00 pm-8:46 am

2 stops9h 46m

London

Mon 1/26

5:40 pm-9:31 am

2 stops18h 51m

$307

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Thu 1/22

7:00 am-6:34 am

1 stop20h 34m

London

Thu 1/29

8:10 pm-2:02 pm

2 stops44h 52m

$343

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Thu 1/22

11:50 am-6:34 am

2 stops15h 44m

London

Thu 1/29

8:10 pm-11:00 am

2 stops17h 50m

$345

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Thu 1/22

7:00 am-6:34 am

1 stop20h 34m

London

Thu 1/29

8:10 pm-10:03 pm

1 stop28h 53m

$347

Los AngelesLondon

LAX - YXU

LAXYXU

Los Angeles

Sat 1/24

12:15 pm-7:12 pm

1 stop27h 57m

London

Mon 1/26

8:10 pm-11:00 am

2 stops17h 50m

$351

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Wed 1/21

2:08 pm-6:34 am

2 stops13h 26m

London

Wed 1/28

8:10 pm-12:12 pm

1 stop19h 02m

$372

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 1/21

7:00 am-9:21 pm

2 stops11h 21m

London

Wed 1/28

5:40 pm-10:16 pm

1 stop7h 36m

$373

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Wed 1/21

8:10 am-9:21 pm

1 stop10h 11m

London

Wed 1/28

5:40 pm-10:16 pm

1 stop7h 36m

$387

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 day to depart on your flight to London, Ontario?

According to our data, Wednesday is the cheapest day to fly to London, Ontario from United States. The lowest ticket price found for a Wednesday departure recently was $199. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Friday as prices are generally higher than usual. According to our data, the average ticket price to London, Ontario on Friday is $549.

What is the cheapest time of day to depart on your flight to London, Ontario?

In the afternoon is the cheapest time of day to fly from United States to London, Ontario when you can find flight prices for as low as $284. Flying to London, Ontario in the afternoon is an ideal time because this is during off-peak travel hours. In the morning is when there is more demand to fly to London, Ontario, so prices are often more expensive at around $514 per ticket.

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 26m

Direct flights

None
The fastest flight from United States to London, Ontario takes 4h 26m
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
3,193 reviews
Search WestJet flights
Air CanadaPriceFrom $178Free CancellationRating
7.1
10,514 reviews
Search Air Canada flights
United AirlinesPriceFrom $186Free CancellationRating
7.4
9,089 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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