AirHint found the following cheapest return flights from Richmond (RIC) to San Juan (SJU) in September 2025 (see full year).

Return flights

27 Sep - 02 Oct	Spirit Airlines
29 Sep - 02 Oct	Delta
25 Sep - 02 Oct	Delta
25 Sep - 27 Sep	Delta
27 Sep - 30 Sep	Spirit Airlines
23 Sep - 30 Sep	Delta
22 Sep - 29 Sep	Delta
27 Sep - 29 Sep	Spirit Airlines
22 Sep - 02 Oct	Spirit Airlines
27 Sep - 28 Sep	Spirit Airlines
23 Sep - 02 Oct	Spirit Airlines
25 Sep - 30 Sep	Spirit Airlines
22 Sep - 25 Sep	Spirit Airlines
23 Sep - 25 Sep	Spirit Airlines
25 Sep - 28 Sep	Spirit Airlines

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

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 Richmond to San Juan in September from 221€

Return flights