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

Return flights

22 Aug - 02 Sep	Spirit Airlines
20 Aug - 04 Sep	jetBlue
05 Aug - 11 Aug	Spirit Airlines
31 Aug - 07 Sep	Air France
03 Aug - 11 Aug	Spirit Airlines
04 Aug - 10 Aug	Spirit Airlines
03 Aug - 10 Aug	Spirit Airlines
01 Aug - 09 Aug	Spirit Airlines
21 Aug - 28 Aug	British Airways
17 Aug - 24 Aug	British Airways

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

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 August from $689

Return flights