AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LGW) in March 2026 (see full year).

Return flights

24 Mar - 01 Apr	Air Canada
01 Mar - 10 Mar	Frontier Airlines
27 Mar - 31 Mar	Lufthansa
15 Mar - 20 Mar	Icelandair
18 Mar - 24 Mar	Icelandair
22 Mar - 08 Apr	British Airways
14 Mar - 20 Mar	Icelandair
07 Mar - 16 Mar	Icelandair

Also check the deals for one-way flights from Philadelphia to London in March.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Philadelphia to London in March from $555

Return flights