Cheapest return flights from Philadelphia to London in May from 800€

Best time to book flights for Philadelphia (PHL) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Philadelphia (PHL) to London (LHR) in May 2025 (see full year).

Return flights

11 May - 18 May United
27 May - 10 Jun Aer Lingus
26 May - 09 Jun Aer Lingus
11 May - 14 May Aer Lingus
11 May - 14 May Finnair direct

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

Skyscanner

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