Cheapest return flights from London to San Juan in September from $1188

AirHint found the following cheapest return flights from London (LCY) to San Juan (SJU) in September 2026 (see full year).

Return flights

14 Sep - 21 Sep Aer Lingus
07 Sep - 21 Sep Aer Lingus
07 Sep - 14 Sep Aer Lingus
01 Sep - 08 Sep Aer Lingus
15 Sep - 20 Sep ITA Airways
10 Sep - 26 Sep SWISS
04 Sep - 10 Sep British Airways
02 Sep - 06 Sep Aer Lingus
11 Sep - 20 Sep ITA Airways

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

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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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