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

Return flights

07 Apr - 21 Apr	Air Canada
07 Apr - 21 Apr	British Airways	direct
23 Apr - 07 May	Aer Lingus
23 Apr - 30 Apr	Finnair	direct
03 Apr - 10 Apr	British Airways	direct
13 Apr - 20 Apr	British Airways	direct
23 Apr - 07 May	British Airways	direct
26 Apr - 10 May	British Airways	direct

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

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 April from 589€

Return flights