AirHint found the following cheapest return flights from Boston (BOS) to Port-of-spain (POS) in September 2025 (see full year).

Return flights

25 Sep - 29 Sep	Spirit Airlines
18 Sep - 22 Sep	Spirit Airlines
17 Sep - 21 Sep	Spirit Airlines
05 Sep - 13 Sep	Air Canada
19 Sep - 23 Sep	Air Canada
13 Sep - 17 Sep	Air Canada
22 Sep - 26 Sep	Air Canada
05 Sep - 20 Sep	Air Canada
18 Sep - 21 Sep	Spirit Airlines
25 Sep - 28 Sep	Spirit Airlines

Also check the deals for one-way flights from Boston to Port-of-spain 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 Boston to Port-of-spain in September from $416

Return flights