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

Return flights

09 Mar - 22 Mar	TAP
12 Mar - 16 Mar	Scandinavian Airlines
10 Mar - 17 Mar	Scandinavian Airlines
25 Mar - 31 Mar	Aer Lingus
03 Mar - 10 Mar	United
21 Mar - 29 Mar	Air Canada
03 Mar - 10 Mar	British Airways	direct
10 Mar - 17 Mar	British Airways	direct
25 Mar - 31 Mar	British Airways	direct
13 Mar - 20 Mar	United
12 Mar - 08 Apr	United
12 Mar - 08 Apr	British Airways	direct
27 Mar - 05 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 437€

Return flights