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Cheap flights from Philadelphia to London

The cheapest round trip from Philadelphia to London that travelers found recently is $853 with a carry-on: a $853 fare on Air Canada, which usually includes a carry-on. It leaves Mon, Mar 22 and comes back Sun, Mar 28.

Live prices for Mon, Mar 22 to Sun, Mar 28

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$853Cheapest round trip, carry-on included (est.)
$953Typical round trip found recently
MarchCheapest month in the next few, from $853
0%Of these fares are nonstop

Cheapest trips travelers found recently

LeaveReturnAirlineAirportsStopsFareCarry-on (est.)TotalLive prices
Mon, Mar 22Sun, Mar 28Air CanadaPHL → LHR2 stops$853Included$853Live price
Fri, Oct 23Mon, Nov 2Aer LingusPHL → STN3 stops$953Included$953Live price
Thu, Feb 18Thu, Feb 25FrontierPHL → LGW2 stops$846+$110$956Live price

Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.

Cheapest month to fly

MonthCheapest tripFromLive prices
October 2026Fri, Oct 23 to Mon, Nov 2, 10 nights$953Live price
February 2027Thu, Feb 18 to Thu, Feb 25, 7 nights$956Live price
March 2027Mon, Mar 22 to Sun, Mar 28, 6 nights$853Live price

Bag fees on this route

What the airlines flying Philadelphia to London usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.

AirlineCarry-on, each wayChecked bag, each way
Aer LingusIncludedIncluded
Air CanadaIncludedIncluded
Frontier$55$50

Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.

How these prices work

These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).

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