AirHint found the following cheapest return flights from San Jose (SJC) to London (LHR) in January 2026 (see full year).

Return flights

19 Jan - 26 Jan	British Airways
14 Jan - 23 Jan	Delta
14 Jan - 29 Jan	British Airways
12 Jan - 29 Jan	British Airways
13 Jan - 28 Jan	British Airways
17 Jan - 29 Jan	Delta
23 Jan - 01 Feb	Delta
10 Jan - 31 Jan	British Airways
10 Jan - 27 Jan	British Airways
10 Jan - 28 Jan	British Airways
10 Jan - 29 Jan	British Airways
10 Jan - 01 Feb	British Airways

Also check the deals for one-way flights from San Jose to London in January.

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 Jose to London in January from 505€

Return flights