AirHint found the following cheapest return flights from San Francisco (SFO) to London (LHR) in May 2026 (see full year).

Return flights

07 May - 11 May	TAP
12 May - 26 May	TAP
06 May - 20 May	Air Canada
01 May - 08 May	TAP
08 May - 20 May	Air Canada
05 May - 21 May	Aer Lingus
06 May - 21 May	Delta	direct
05 May - 21 May	Delta	direct
01 May - 12 May	Virgin Atlantic
03 May - 10 May	Air France
19 May - 04 Jun	Aer Lingus
24 May - 03 Jun	Austrian Airlines
24 May - 03 Jun	Austrian Airlines	direct
26 May - 15 Jun	SWISS
29 May - 05 Jun	Air Canada
31 May - 17 Jun	Air Canada
26 May - 15 Jun	Austrian Airlines	direct
29 May - 05 Jun	Austrian Airlines	direct
29 May - 07 Jun	WestJet
29 May - 07 Jun	Austrian Airlines	direct

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

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 San Francisco to London in May from 449€

Return flights