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

Return flights

18 Oct - 20 Oct	Frontier Airlines
16 Oct - 23 Oct	Frontier Airlines
15 Oct - 16 Oct	Frontier Airlines
10 Oct - 13 Oct	Frontier Airlines
13 Oct - 19 Oct	Spirit Airlines
18 Oct - 25 Oct	British Airways
10 Oct - 17 Oct	British Airways
12 Oct - 19 Oct	British Airways

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

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 October from $664

Return flights