Cheapest return IAD–STT flights, May

AirHint found the following cheapest return flights from Washington (IAD) to St. Thomas (STT) in May 2026 (see full year).

Return flights

19 May - 19 May United
14 May - 19 May United direct
18 May - 20 May United direct
17 May - 20 May United direct
16 May - 20 May United direct
15 May - 20 May United
19 May - 23 May United
05 May - 12 May United
12 May - 15 May United
16 May - 21 May United
30 May - 05 Jun Frontier Airlines
28 May - 01 Jun Frontier Airlines
30 May - 03 Jun Frontier Airlines
30 May - 06 Jun Frontier Airlines
31 May - 06 Jun Frontier Airlines
08 May - 07 Jun Frontier Airlines
30 May - 03 Jun United direct
30 May - 01 Jun United direct
30 May - 02 Jun United direct
23 May - 01 Jun Frontier Airlines

Also check the deals for one-way flights from Washington to St. Thomas in May.

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