Cheapest return flights from San Francisco to London in September from $547

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 September 2025 (see full year).

Return flights

29 Sep - 13 Oct TAP
20 Sep - 01 Oct Hawaiian Airlines
09 Sep - 23 Sep TAP
24 Sep - 29 Sep TAP
05 Sep - 14 Sep Hawaiian Airlines
12 Sep - 26 Sep Alaska Airlines
27 Sep - 04 Oct Iberia
02 Sep - 16 Sep TAP
19 Sep - 24 Sep Alaska Airlines
03 Sep - 14 Sep Alaska Airlines
16 Sep - 21 Sep Iberia
19 Sep - 21 Sep Alaska Airlines
07 Sep - 22 Sep jetBlue
18 Sep - 07 Oct Flair Airlines
25 Sep - 23 Oct jetBlue

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

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.

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