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

Return flights

07 Mar - 09 Mar	Scandinavian Airlines
02 Mar - 10 Mar	TAP
13 Mar - 15 Mar	TAP
13 Mar - 25 Mar	TAP
06 Mar - 15 Mar	TAP
16 Mar - 22 Mar	TAP
21 Mar - 14 Apr	TAP
02 Mar - 08 Mar	TAP
09 Mar - 17 Mar	Scandinavian Airlines
11 Mar - 25 Mar	TAP
09 Mar - 12 Mar	Scandinavian Airlines
23 Mar - 06 Apr	Scandinavian Airlines
25 Mar - 01 Apr	Lufthansa
24 Mar - 07 Apr	Austrian Airlines
10 Mar - 02 Apr	Scandinavian Airlines
23 Mar - 01 Apr	Scandinavian Airlines
24 Mar - 01 Apr	Air Canada
31 Mar - 15 Apr	Air Canada
25 Mar - 02 Apr	Air Canada
21 Mar - 01 Apr	Aer Lingus

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 $446

Return flights