Cheapest return flights from San Francisco to London in April from $550

Best time to book flights for San Francisco (SFO) to London (LGW) flights at AirHint

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

Return flights

28 Apr - 07 May Frontier Airlines
29 Apr - 04 May Hawaiian Airlines
28 Apr - 13 May Frontier Airlines
29 Apr - 13 May Hawaiian Airlines
08 Apr - 24 Apr Brussels Airlines
07 Apr - 28 Apr Frontier Airlines
27 Apr - 04 May Frontier Airlines
15 Apr - 22 Apr Hawaiian Airlines
07 Apr - 01 May FrenchBee
08 Apr - 14 Apr SWISS
27 Apr - 09 May British Airways
06 Apr - 14 Apr SWISS
07 Apr - 14 Apr SWISS
29 Apr - 19 May SWISS
27 Apr - 13 May British Airways
10 Apr - 20 Apr Frontier Airlines
13 Apr - 28 Apr Frontier Airlines
23 Apr - 07 May Sun Country Airlines
16 Apr - 29 Apr SWISS
14 Apr - 28 Apr Frontier Airlines

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

Skyscanner

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.

Book a cheap hotel in London

Cheap car rent in London