Cheapest return flights from San Francisco to London in May from $621

Best time to book flights for San Francisco (SFO) to London (LGW) flights at AirHint

AirHint found the following cheapest return flights from San Francisco (SFO) to London (LGW) in May 2025 (see full year).

Return flights

13 May - 20 May SWISS
13 May - 22 May Lufthansa
21 May - 28 May Air Canada
16 May - 01 Jun Condor
16 May - 27 May Condor
23 May - 09 Jun SWISS
26 May - 02 Jun Frontier Airlines
22 May - 05 Jun Frontier Airlines
15 May - 20 May Condor
26 May - 09 Jun Frontier Airlines
23 May - 26 May SWISS
29 May - 12 Jun Frontier Airlines
26 May - 03 Jun Air Canada
22 May - 25 May Frontier Airlines
26 May - 13 Jun Frontier Airlines
20 May - 28 May SWISS
16 May - 26 May Lufthansa
18 May - 22 May Vueling Airlines
28 May - 09 Jun Frontier Airlines
28 May - 11 Jun Air Canada

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

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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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