Cheapest return IAD–STT flights, June

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

Return flights

04 Jun - 08 Jun Frontier Airlines
18 Jun - 23 Jun Frontier Airlines
19 Jun - 26 Jun Frontier Airlines
06 Jun - 09 Jun Frontier Airlines
22 Jun - 25 Jun United
13 Jun - 14 Jun United
13 Jun - 16 Jun United direct
06 Jun - 09 Jun United direct
13 Jun - 15 Jun United direct
07 Jun - 09 Jun Frontier Airlines

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

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