Cheapest return flights from Seattle to San Juan in December from 198€

AirHint found the following cheapest return flights from Seattle (SEA) to San Juan (SJU) in December 2025 (see full year).

Return flights

05 Dec - 10 Dec Frontier Airlines
07 Dec - 11 Dec Frontier Airlines
06 Dec - 13 Dec Frontier Airlines
04 Dec - 10 Dec Frontier Airlines
06 Dec - 11 Dec Frontier Airlines
12 Dec - 20 Dec Frontier Airlines
10 Dec - 17 Dec United
12 Dec - 15 Dec Frontier Airlines
01 Dec - 05 Dec Frontier Airlines
03 Dec - 10 Dec Alaska Airlines
19 Dec - 19 Jan Frontier Airlines
27 Dec - 10 Jan Delta

Also check the deals for one-way flights from Seattle to San Juan in December.

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