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

Return flights

14 Mar - 26 Mar	TAP
13 Mar - 20 Mar	TAP
14 Mar - 27 Mar	TAP
14 Mar - 21 Mar	TAP
12 Mar - 20 Mar	Scandinavian Airlines
12 Mar - 19 Mar	Scandinavian Airlines
13 Mar - 22 Mar	TAP
20 Mar - 29 Mar	Scandinavian Airlines
15 Mar - 01 Apr	Air Canada
24 Mar - 18 Apr	Scandinavian Airlines
24 Mar - 07 Apr	Air Canada
14 Mar - 22 Mar	Scandinavian Airlines
22 Mar - 29 Mar	Scandinavian Airlines
18 Mar - 04 Apr	TAP
25 Mar - 18 Apr	TAP
20 Mar - 11 Apr	TAP
24 Mar - 07 Apr	British Airways	direct
29 Mar - 18 Apr	Aer Lingus
15 Mar - 01 Apr	Delta	direct
15 Mar - 04 Apr	Scandinavian Airlines

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 $474

Return flights