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

Return flights

16 Mar - 22 Mar	TAP
14 Mar - 22 Mar	TAP
02 Mar - 10 Mar	TAP
11 Mar - 17 Mar	TAP
11 Mar - 18 Mar	TAP
06 Mar - 13 Mar	TAP
23 Mar - 23 Apr	TAP
23 Mar - 06 Apr	TAP
21 Mar - 23 Mar	Scandinavian Airlines
02 Mar - 31 Mar	TAP
03 Mar - 10 Mar	Scandinavian Airlines
02 Mar - 06 Mar	Scandinavian Airlines
20 Mar - 03 Apr	TAP
31 Mar - 30 Apr	Scandinavian Airlines
17 Mar - 14 Apr	Scandinavian Airlines
01 Mar - 01 Apr	Delta
24 Mar - 07 Apr	Delta
24 Mar - 07 Apr	British Airways	direct
17 Mar - 14 Apr	British Airways	direct
31 Mar - 30 Apr	British Airways	direct

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

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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Cheapest return flights from San Francisco to London in March from $424

Return flights