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

Return flights

01 Apr - 06 Apr	Spirit Airlines
01 Apr - 08 Apr	Spirit Airlines
25 Apr - 04 May	Spirit Airlines
24 Apr - 04 May	Spirit Airlines
06 Apr - 12 Apr	Frontier Airlines
30 Apr - 10 May	Spirit Airlines
05 Apr - 12 Apr	Aer Lingus
01 Apr - 05 Apr	Frontier Airlines

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.

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Cheapest return flights from Philadelphia to London in April from 475€

Return flights