AirHint found the following cheapest return flights from San Francisco (SFO) to London (LGW) in July 2025 (see full year).

Return flights

29 Jul - 26 Aug	SWISS
24 Jul - 22 Aug	Frontier Airlines
16 Jul - 13 Aug	Virgin Atlantic
25 Jul - 19 Aug	Frontier Airlines
15 Jul - 22 Jul	Delta
16 Jul - 24 Jul	Delta
14 Jul - 22 Jul	Delta
20 Jul - 28 Jul	American Airlines
14 Jul - 18 Aug	Frontier Airlines
09 Jul - 14 Aug	Air France
15 Jul - 23 Jul	Air France
08 Jul - 12 Jul	Iberia For Level
16 Jul - 25 Jul	Delta
13 Jul - 22 Jul	Delta
14 Jul - 09 Aug	Frontier Airlines
05 Jul - 13 Aug	jetBlue
28 Jul - 11 Aug	Frontier Airlines
30 Jul - 08 Aug	Frontier Airlines
22 Jul - 28 Jul	Delta
23 Jul - 28 Jul	Delta

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

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 July from 424€

Return flights