AirHint found the following cheapest return flights from San Juan (SJU) to London (LHR) in December 2025 (see full year).

Return flights

01 Dec - 11 Dec	Air France
30 Dec - 07 Jan	Delta
04 Dec - 11 Dec	British Airways
02 Dec - 09 Dec	British Airways
26 Dec - 18 Jan	Virgin Atlantic
08 Dec - 15 Dec	British Airways
06 Dec - 13 Dec	British Airways
16 Dec - 23 Dec	British Airways
20 Dec - 06 Jan	United
31 Dec - 07 Jan	British Airways
10 Dec - 17 Dec	British Airways
25 Dec - 01 Jan	British Airways
22 Dec - 29 Dec	British Airways
28 Dec - 04 Jan	British Airways
19 Dec - 26 Dec	British Airways
13 Dec - 20 Dec	British Airways

Also check the deals for one-way flights from San Juan to London in December.

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 Juan to London in December from 472€

Return flights