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Cheap flights from Philadelphia to London from $321

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to London departing on 9/8. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Philadelphia to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Air Canada Logo
4:20 pm - 9:40 pmPHL  Philadelphia-YXU London
5h 20m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 am - 9:56 amYXU  London-PHL Philadelphia
4h 16m1 stop Toronto Pearson Intl
$755Air Canada
Thu, Sep 24 - Thu, Oct 1
Air Canada Logo
10:50 am - 2:50 pmPHL  Philadelphia-YXU London
4h 00m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 am - 10:11 amYXU  London-PHL Philadelphia
4h 31m1 stop Toronto Pearson Intl
$755Air Canada
Thu, Sep 10 - Thu, Sep 17
Air Canada Logo
4:20 pm - 9:40 pmPHL  Philadelphia-YXU London
5h 20m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 am - 2:47 pmYXU  London-PHL Philadelphia
9h 07m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl
$763Air Canada
Thu, Sep 24 - Thu, Oct 1
Air Canada Logo
10:05 am - 5:43 pmPHL  Philadelphia-YXU London
7h 38m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Air Canada Logo
6:20 pm - 10:46 pmYXU  London-PHL Philadelphia
4h 26m1 stop Toronto Pearson Intl
$763Air Canada
Thu, Sep 10 - Thu, Sep 17
Air Canada Logo
10:05 am - 5:43 pmPHL  Philadelphia-YXU London
7h 38m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Air Canada Logo
5:40 am - 2:47 pmYXU  London-PHL Philadelphia
9h 07m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl
$772Air Canada
Thu, Sep 10 - Thu, Sep 17
Air Canada Logo
10:05 am - 5:43 pmPHL  Philadelphia-YXU London
7h 38m2 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl
Air Canada Logo
3:30 pm - 9:32 pmYXU  London-PHL Philadelphia
6h 02m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl
$772Air Canada
Thu, Sep 24 - Thu, Oct 1
Air Canada Logo
4:20 pm - 9:40 pmPHL  Philadelphia-YXU London
5h 20m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 am - 10:11 amYXU  London-PHL Philadelphia
4h 31m1 stop Toronto Pearson Intl
$828Air Canada
Fri, Sep 4 - Tue, Sep 8
Air Canada Logo
4:20 pm - 9:40 pmPHL  Philadelphia-YXU London
5h 20m1 stop Toronto Pearson Intl
Air Canada Logo
5:40 am - 2:47 pmYXU  London-PHL Philadelphia
9h 07m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl
$836Air Canada
Fri, Sep 4 - Tue, Sep 8
Air Canada Logo
10:30 am - 9:40 pmPHL  Philadelphia-YXU London
11h 10m2 stops Washington, D.C. Dulles Intl Toronto Pearson Intl
Air Canada Logo
3:30 pm - 9:32 pmYXU  London-PHL Philadelphia
6h 02m2 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl
$941Air Canada
Fri, Sep 4 - Tue, Sep 8
United Airlines Logo
10:50 am - 2:50 pmPHL  Philadelphia-YXU London
4h 00m1 stop Toronto Pearson Intl
United Airlines Logo
5:40 am - 9:56 amYXU  London-PHL Philadelphia
4h 16m1 stop Toronto Pearson Intl
$1,047United Airlines
Fri, Sep 25 - Fri, Oct 2

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Air Canada flights from Philadelphia to London, Ontario

Our best Air Canada deals on Philadelphia to London, Ontario flight tickets
Air Canada
Sep 10
PHL10:50 amPhiladelphia
4h 00m
1 stop
YXU2:50 pmLondon
Sep 17
YXU5:40 amLondon
4h 31m
1 stop
PHL10:11 amPhiladelphia
$755
Air Canada
Sep 10
PHL10:05 amPhiladelphia
7h 38m
2 stops
YXU5:43 pmLondon
Sep 17
YXU6:20 pmLondon
4h 26m
1 stop
PHL10:46 pmPhiladelphia
$763
Air Canada
Sep 10
PHL10:05 amPhiladelphia
7h 38m
2 stops
YXU5:43 pmLondon
Sep 17
YXU5:40 amLondon
9h 07m
2 stops
PHL2:47 pmPhiladelphia
$772

United Airlines flights from Philadelphia to London, Ontario

Our best United Airlines deals on Philadelphia to London, Ontario flight tickets
United Airlines
Sep 25
PHL10:50 amPhiladelphia
4h 00m
1 stop
YXU2:50 pmLondon
Oct 2
YXU5:40 amLondon
4h 16m
1 stop
PHL9:56 amPhiladelphia
$1,047
United Airlines
Aug 22
PHL10:50 amPhiladelphia
4h 00m
1 stop
YXU2:50 pmLondon
Aug 30
YXU6:20 pmLondon
4h 26m
1 stop
PHL10:46 pmPhiladelphia
$1,224
United Airlines
Aug 22
PHL8:20 amPhiladelphia
13h 20m
2 stops
YXU9:40 pmLondon
Aug 30
YXU6:20 pmLondon
4h 26m
1 stop
PHL10:46 pmPhiladelphia
$1,234

momondo Fare Finder

 
Customize your flight search to find flights from Philadelphia 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 August 13, 2026.
Use the filters below to find and compare flights from Philadelphia to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Thu 9/24

4:20 pm-9:40 pm

1 stop5h 20m

London

Thu 10/1

5:40 am-9:56 am

1 stop4h 16m

$755

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Thu 9/10

10:50 am-2:50 pm

1 stop4h 00m

London

Thu 9/17

5:40 am-10:11 am

1 stop4h 31m

$755

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Thu 9/24

4:20 pm-9:40 pm

1 stop5h 20m

London

Thu 10/1

5:40 am-2:47 pm

2 stops9h 07m

$763

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Thu 9/10

10:05 am-5:43 pm

2 stops7h 38m

London

Thu 9/17

6:20 pm-10:46 pm

1 stop4h 26m

$763

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Thu 9/10

10:05 am-5:43 pm

2 stops7h 38m

London

Thu 9/17

5:40 am-2:47 pm

2 stops9h 07m

$772

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Thu 9/24

10:05 am-5:43 pm

2 stops7h 38m

London

Thu 10/1

3:30 pm-9:32 pm

2 stops6h 02m

$772

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Fri 9/4

4:20 pm-9:40 pm

1 stop5h 20m

London

Tue 9/8

5:40 am-10:11 am

1 stop4h 31m

$828

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Fri 9/4

4:20 pm-9:40 pm

1 stop5h 20m

London

Tue 9/8

5:40 am-2:47 pm

2 stops9h 07m

$836

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Fri 9/4

10:30 am-9:40 pm

2 stops11h 10m

London

Tue 9/8

3:30 pm-9:32 pm

2 stops6h 02m

$941
Quickest round-trip

PhiladelphiaLondon

PHL Philadelphia - YXU London

PHLYXU

Philadelphia

Fri 9/25

10:50 am-2:50 pm

1 stop4h 00m

London

Fri 10/2

5:40 am-9:56 am

1 stop4h 16m

$1,047

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 Philadelphia 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 airline that flies from Philadelphia to London?

Air Canada, WestJet, and United Airlines are the most popular carriers operating from Philadelphia to London

What airlines fly to London, Ontario?

Air Canada, Porter Airlines and United Airlines are the top three most popular airlines that fly to London, Ontario from Philadelphia according to our data. Air Canada is the first choice among our users, with 46% of people opting to fly with this airline when traveling to London, Ontario. Keep in mind that there are 8 different airlines that fly to London, Ontario on a routine basis, so you have a few additional options to choose from.

When to book flights from Philadelphia to London, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Philadelphia to London, Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Philadelphia to London, Ontario (PHL to YXU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Philadelphia to London, Ontario

Fastest flight time

4h 00m

Direct flights

None
The fastest flight from Philadelphia to London, Ontario takes 4h 00m
There are no direct flights from Philadelphia to London, Ontario. There are no popular flight routes from Philadelphia to London, Ontario.
Search flight deals

Frequently asked questions about flying from Philadelphia to London, Ontario

  • How far is Philadelphia to London by plane?

    A flight from Philadelphia to London will travel around 377.5 mi. A reasonable flight in good conditions will take 4h 00m.

  • When did momondo last update prices for flights from Philadelphia Airport to London Airport?

    Prices for flights from Philadelphia Airport to London Airport were last updated today.

  • How old do you have to be to fly from Philadelphia Airport to London Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Philadelphia Airport to London Airport.

  • What documentation or ID do you need to fly to London Airport?

    The necessary travel and health documents for your London Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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 Philadelphia to London?

It is quick and easy to find Philadelphia 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 Philadelphia to London with flexible booking policies on momondo?

Flights from Philadelphia to London with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Philadelphia to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Philadelphia.

I’m not ready to book a flight from Philadelphia 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 Philadelphia and alert you when they change.

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