Cheapest return flights from San Francisco to London in May from $637

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

10 May - 13 May TAP
05 May - 13 May Frontier Airlines
04 May - 08 May Frontier Airlines
13 May - 31 May Vueling Airlines
03 May - 13 May British Airways
14 May - 20 May Scandinavian Airlines
06 May - 17 May British Airways
13 May - 20 May British Airways
02 May - 09 May Frontier Airlines
20 May - 28 May British Airways
20 May - 11 Jun British Airways
20 May - 07 Jun British Airways
24 May - 07 Jun Porter Airlines (Canada) Ltd
31 May - 02 Jun WestJet
23 May - 02 Jun TAP
24 May - 08 Jun TAP
30 May - 04 Jun WestJet
26 May - 09 Jun SWISS
23 May - 03 Jun TAP
21 May - 07 Jun British Airways

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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