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Cheap flights from the United States to London from $248

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 5/21. 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.
WestJet Logo
3:30 pm - 5:20 am
SAN
-
YXU
10h 50m
1 stop
WestJet Logo
6:10 am - 2:10 pm
YXU
-
SAN
11h 00m
1 stop
$408WestJet
Mon, Jun 22 - Mon, Jun 29
WestJet Logo
3:30 pm - 5:20 am
SAN
-
YXU
10h 50m
1 stop
WestJet Logo
6:10 am - 2:10 pm
YXU
-
SAN
11h 00m
1 stop
$450WestJet
Mon, Jun 22 - Mon, Jun 29
WestJet Logo
3:30 pm - 5:20 am
SAN
-
YXU
10h 50m
1 stop
WestJet Logo
6:10 am - 2:10 pm
YXU
-
SAN
11h 00m
1 stop
$457WestJet
Mon, Jun 22 - Mon, Jun 29
WestJet Logo
3:30 pm - 5:20 am
SAN
-
YXU
10h 50m
1 stop
WestJet Logo
6:10 am - 2:10 pm
YXU
-
SAN
11h 00m
1 stop
$458WestJet
Mon, Jun 22 - Mon, Jun 29
Air Canada Logo
1:15 pm - 8:53 am
SAN
-
YXU
16h 38m
1 stop
Air Canada Logo
5:10 am - 12:18 pm
YXU
-
SAN
10h 08m
1 stop
$459Air Canada
Thu, May 28 - Sat, May 30
Multiple Airlines Logo
6:30 pm - 5:20 am
BOS
-
YXU
10h 50m
1 stop
Multiple Airlines Logo
2:40 pm - 9:05 am
YXU
-
BOS
18h 25m
2 stops
$484Multiple Airlines
Sat, May 23 - Sun, May 24
Multiple Airlines Logo
7:25 am - 11:43 am
LGA
-
YXU
4h 18m
1 stop
Multiple Airlines Logo
2:40 pm - 8:55 am
YXU
-
LGA
18h 15m
2 stops
$518Multiple Airlines
Sun, May 31 - Tue, Jun 9
Air Canada Logo
12:05 pm - 5:33 pm
MCO
-
YXU
5h 28m
1 stop
Air Canada Logo
6:10 pm - 11:46 pm
YXU
-
MCO
5h 36m
1 stop
$520Air Canada
Thu, Jun 11 - Sun, Jun 14
United Airlines Logo
10:40 pm - 9:38 pm
SAN
-
YXU
19h 58m
2 stops
United Airlines Logo
5:10 am - 12:18 pm
YXU
-
SAN
10h 08m
1 stop
$541United Airlines
Thu, May 28 - Sat, May 30
United Airlines Logo
7:40 pm - 9:38 pm
SAN
-
YXU
22h 58m
3 stops
United Airlines Logo
5:10 am - 12:18 pm
YXU
-
SAN
10h 08m
1 stop
$546United Airlines
Wed, May 6 - Wed, May 13

WestJet flights from United States to London, Ontario

Our best WestJet deals on United States to London, Ontario flight tickets
WestJet
Jun 22
SAN3:30 pmSan Diego
10h 50m
1 stop
YXU5:20 amLondon
Jun 29
YXU6:10 amLondon
11h 00m
1 stop
SAN2:10 pmSan Diego
$408
WestJet
Jun 22
SAN3:30 pmSan Diego
10h 50m
1 stop
YXU5:20 amLondon
Jun 29
YXU6:10 amLondon
11h 00m
1 stop
SAN2:10 pmSan Diego
$450
WestJet
Jun 22
SAN3:30 pmSan Diego
10h 50m
1 stop
YXU5:20 amLondon
Jun 29
YXU6:10 amLondon
11h 00m
1 stop
SAN2:10 pmSan Diego
$457

Air Canada flights from United States to London, Ontario

Our best Air Canada deals on United States to London, Ontario flight tickets
Air Canada
May 28
SAN1:15 pmSan Diego
16h 38m
1 stop
YXU8:53 amLondon
May 30
YXU5:10 amLondon
10h 08m
1 stop
SAN12:18 pmSan Diego
$459
Air Canada
Jun 11
MCO12:05 pmOrlando
5h 28m
1 stop
YXU5:33 pmLondon
Jun 14
YXU6:10 pmLondon
5h 36m
1 stop
MCO11:46 pmOrlando
$520
Air Canada
May 31
LGA7:25 amNew York LaGuardia
4h 18m
1 stop
YXU11:43 amLondon
Jun 9
YXU9:30 amLondon
4h 06m
1 stop
LGA1:36 pmNew York LaGuardia
$525

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 10, 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

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Mon 6/22

3:30 pm-5:20 am

1 stop10h 50m

London

Mon 6/29

6:10 am-2:10 pm

1 stop11h 00m

$408

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Mon 6/22

3:30 pm-5:20 am

1 stop10h 50m

London

Mon 6/29

6:10 am-2:10 pm

1 stop11h 00m

$450

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Mon 6/22

3:30 pm-5:20 am

1 stop10h 50m

London

Mon 6/29

6:10 am-2:10 pm

1 stop11h 00m

$457

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Mon 6/22

3:30 pm-5:20 am

1 stop10h 50m

London

Mon 6/29

6:10 am-2:10 pm

1 stop11h 00m

$458

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Thu 5/28

1:15 pm-8:53 am

1 stop16h 38m

London

Sat 5/30

5:10 am-12:18 pm

1 stop10h 08m

$459

BostonLondon

BOS - YXU

BOSYXU

Boston Logan Intl

Sat 5/23

6:30 pm-5:20 am

1 stop10h 50m

London

Sun 5/24

2:40 pm-9:05 am

2 stops18h 25m

$484

New YorkLondon

LGA - YXU

LGAYXU

New York LaGuardia

Sun 5/31

7:25 am-11:43 am

1 stop4h 18m

London

Tue 6/9

2:40 pm-8:55 am

2 stops18h 15m

$518
Quickest round-trip

OrlandoLondon

MCO - YXU

MCOYXU

Orlando

Thu 6/11

12:05 pm-5:33 pm

1 stop5h 28m

London

Sun 6/14

6:10 pm-11:46 pm

1 stop5h 36m

$520

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Thu 5/28

10:40 pm-9:38 pm

2 stops19h 58m

London

Sat 5/30

5:10 am-12:18 pm

1 stop10h 08m

$541

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Wed 5/6

7:40 pm-9:38 pm

3 stops22h 58m

London

Wed 5/13

5:10 am-12:18 pm

1 stop10h 08m

$546

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 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
Air CanadaPriceFrom $210Free CancellationRating
7.1
10,915 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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