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Cheap flights from the United States to London, ON from C$ 275

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 15/6. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — YXU
26 Apr — 3 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from USA to London

Enter your travel dates to find the best prices.

Cheapest flights from USA to London
Explore the most affordable flight options available from USA to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 March 2026.

Tue 21/411:00 a.m.
SAN
-
YXU
2 stops18h 44m
Air Canada
Tue 28/45:10 a.m.
YXU
-
SAN
1 stop9h 43m
Air Canada
Deal found 24/3C$ 553
Tue 9/66:05 p.m.
SFO
-
YXU
1 stop8h 15m
WestJet
Sat 13/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 23/3C$ 559
Wed 10/66:05 p.m.
SFO
-
YXU
1 stop8h 15m
WestJet
Sat 13/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 24/3C$ 560
Fri 12/66:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Sat 13/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 24/3C$ 592
Thu 11/66:00 a.m.
SFO
-
YXU
1 stop7h 45m
WestJet
Fri 12/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 24/3C$ 600
Wed 10/66:05 p.m.
SFO
-
YXU
1 stop19h 40m
WestJet
Fri 12/62:40 p.m.
YXU
-
SFO
2 stops10h 15m
WestJet
Deal found 23/3C$ 603
Tue 9/66:05 p.m.
SFO
-
YXU
1 stop19h 40m
WestJet
Fri 12/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 24/3C$ 607
Sun 3/51:00 p.m.
SFO
-
YXU
1 stop24h 45m
WestJet
Fri 12/66:10 a.m.
YXU
-
SFO
1 stop8h 50m
WestJet
Deal found 25/3C$ 627
Sun 31/56:34 p.m.
SFO
-
YXU
2 stops17h 24m
United Airlines
Thu 4/69:30 a.m.
YXU
-
SFO
1 stop9h 05m
United Airlines
Deal found 24/3C$ 636
Tue 28/46:20 p.m.
SAN
-
YXU
2 stops11h 24m
United Airlines
Sat 2/55:10 a.m.
YXU
-
SAN
1 stop10h 08m
United Airlines
Deal found 24/3C$ 639
Mon 11/57:35 p.m.
SEA
-
YXU
1 stop6h 45m
WestJet
Mon 18/56:10 a.m.
YXU
-
SEA
1 stop15h 35m
WestJet
Deal found 27/3C$ 645
Sun 31/57:30 p.m.
SFO
-
YXU
2 stops13h 13m
Air Canada
Thu 4/65:10 a.m.
YXU
-
SFO
1 stop8h 40m
Air Canada
Deal found 26/3C$ 648

Find flight deals from USA to London

Keep the following information in mind while searching for USA to London flight deals. Data was last updated 27 March 2026.

Round-trip from

C$ 553

One-way from

C$ 275
Air Canada
  • Air Canada
  • 21/4-28/4
  • 3 total stops
  • 28h 27m total
  • USA to London
Search Deals
WestJet
  • WestJet
  • 15/6
  • 1 total stop
  • 8h 15m total
  • USA to London
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from USA to London 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, Cheapflights users made 629,999 searches. Data last updated 27 March 2026.
Use the filters below to find and compare flights from the United States to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Tue 21/4

11:00 a.m.-8:44 a.m.

2 stops18h 44m

London

Tue 28/4

5:10 a.m.-11:53 a.m.

1 stop9h 43m

C$ 553

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 31/5

6:34 p.m.-2:58 p.m.

2 stops17h 24m

London

Thu 4/6

9:30 a.m.-3:35 p.m.

1 stop9h 05m

C$ 636

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Tue 28/4

6:20 p.m.-8:44 a.m.

2 stops11h 24m

London

Sat 2/5

5:10 a.m.-12:18 p.m.

1 stop10h 08m

C$ 639

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sun 31/5

7:30 p.m.-11:43 a.m.

2 stops13h 13m

London

Thu 4/6

12:20 p.m.-9:02 p.m.

2 stops11h 42m

C$ 660

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Tue 28/4

6:20 a.m.-8:44 a.m.

2 stops23h 24m

London

Sat 2/5

5:10 a.m.-12:18 p.m.

1 stop10h 08m

C$ 674

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Mon 1/6

7:35 p.m.-5:20 a.m.

1 stop6h 45m

London

Fri 5/6

5:55 p.m.-6:45 p.m.

1 stop27h 50m

C$ 696

SeattleLondon

SEA - YXU

SEAYXU

Seattle/Tacoma Intl

Fri 29/5

7:35 p.m.-5:20 a.m.

1 stop6h 45m

London

Tue 2/6

5:55 p.m.-6:45 p.m.

1 stop27h 50m

C$ 696

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Mon 1/6

9:00 p.m.-5:33 p.m.

2 stops17h 33m

London

Thu 4/6

9:30 a.m.-7:24 p.m.

2 stops12h 54m

C$ 719

San DiegoLondon

SAN - YXU

SANYXU

San Diego

Wed 6/5

1:15 p.m.-8:53 a.m.

1 stop16h 38m

London

Wed 13/5

5:10 a.m.-12:18 p.m.

1 stop10h 08m

C$ 746

San FranciscoLondon

SFO - YXU

SFOYXU

San Francisco

Sat 23/5

6:00 a.m.-4:45 p.m.

1 stop7h 45m

London

Tue 26/5

2:40 p.m.-9:55 p.m.

2 stops10h 15m

C$ 753

Flights are sorted by cheapest round-trip flights first.

Deals found on 22/3

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from USA to London

Have a flexible travel schedule? Discover the best time to fly to London from USA with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from the United States to London

What is the cheapest month to book a flight from USA to London, Ontario?

Currently, February is the cheapest month in which you can book a flight from USA to London, Ontario (average of C$ 111). Flying from USA to London, Ontario in March is currently the most expensive (average of C$ 162). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from USA to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to London from United States?

    London (YXU), located 8.6 km from the city centre, is the airport you fly into when you book flights from United States to London.

  • How long is the flight from USA to London, Ontario?

    Airlines like Air Canada, United Airlines, and WestJet fly from USA to London, Ontario in about 6h 45m. The time it takes to get you to your destination can typically vary by up to 11h 59m. USA and London, Ontario are separated by a distance of 3219 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from USA to London, Ontario?

    The most popular route from USA to London, Ontario is San Francisco - London. You may also consider Denver Intl - London or New York LaGuardia - London.

  • Can I find deals for flights from USA to London that include hotel bookings?

    Yes. In addition to deals on USA to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from USA to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from USA to London.

  • Can I find deals for business class flights from USA to London?

    Yes. Cheapflights offers flight deals from USA to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from USA to London, Ontario?

    Currently, February is the cheapest month in which you can book a flight from USA to London, Ontario (average of C$ 111). Flying from USA to London, Ontario in March is currently the most expensive (average of C$ 162). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
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Alternative routes for USA to London

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from USA to London?

Deals for USA to London flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from USA to London?

Cheapflights simply makes it quick and affordable to book flights from USA to London by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from USA to London with no change fees?

Yes, we can. To see specific flights from USA to London with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from USA to London become cheaper?

Yes, Cheapflights offers price alerts on USA to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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