Cheapest return IAD–SJU flights, October

AirHint found the following cheapest return flights from Washington (IAD) to San Juan (SJU) in October 2026 (see full year).

Return flights

03 Oct - 06 Oct Frontier Airlines
26 Oct - 03 Nov Frontier Airlines
09 Oct - 13 Oct Frontier Airlines
26 Oct - 03 Nov United direct
29 Oct - 03 Nov United direct
03 Oct - 06 Oct United direct
08 Oct - 11 Oct Frontier Airlines
10 Oct - 14 Oct Delta
09 Oct - 16 Oct Frontier Airlines
10 Oct - 14 Oct United direct
29 Oct - 02 Nov Frontier Airlines
08 Oct - 11 Oct United direct
09 Oct - 16 Oct United direct

Also check the deals for one-way flights from Washington to San Juan in October.

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