AirHint found the following cheapest return flights from London (LHR) to San Diego (SAN) in May 2026 (see full year).

Return flights

02 May - 02 May	Lufthansa
05 May - 18 May	Lufthansa
04 May - 12 May	Lufthansa
11 May - 16 May	Lufthansa
09 May - 16 May	Lufthansa
04 May - 07 May	Lufthansa
11 May - 18 May	Lufthansa
09 May - 18 May	Lufthansa
12 May - 19 May	Lufthansa
06 May - 18 May	Lufthansa
26 May - 03 Jun	Lufthansa
29 May - 01 Jun	Lufthansa
28 May - 01 Jun	Lufthansa
29 May - 01 Jun	British Airways	direct
28 May - 01 Jun	British Airways	direct
30 May - 06 Jun	Air Canada
28 May - 04 Jun	British Airways
30 May - 06 Jun	British Airways	direct

Also check the deals for one-way flights from London to San Diego in May.

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 London to San Diego in May from 249€

Return flights