AirHint found the following cheapest one-way flights from Port-of-spain (POS) to Castries (SLU) in September 2025 (see full year).

One-Way flights

27 Sep	Caribbean Airlines	direct
28 Sep	Caribbean Airlines	direct
29 Sep	Caribbean Airlines	direct
26 Sep	Caribbean Airlines	direct
22 Sep	Caribbean Airlines	direct
24 Sep	Caribbean Airlines
25 Sep	Caribbean Airlines	direct
30 Sep	Caribbean Airlines
23 Sep	Caribbean Airlines

Also check the deals for return flights from Port-of-spain to Castries 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 one-way flights from Port-of-spain to Castries in September from 140€

One-Way flights