Cheapest return flights from Boston to San Juan in January from $107

AirHint found the following cheapest return flights from Boston (BOS) to San Juan (SJU) in January 2026 (see full year).

Return flights

01 Jan - 16 Jan Frontier Airlines direct
06 Jan - 17 Jan Frontier Airlines
06 Jan - 15 Jan Frontier Airlines
06 Jan - 14 Jan Frontier Airlines
06 Jan - 10 Jan Frontier Airlines
01 Jan - 15 Jan Spirit Airlines
26 Jan - 29 Jan Spirit Airlines direct
18 Jan - 24 Jan Spirit Airlines direct
26 Jan - 31 Jan Spirit Airlines direct
12 Jan - 16 Jan Spirit Airlines direct
25 Jan - 12 Feb Spirit Airlines direct
25 Jan - 04 Feb Spirit Airlines direct
25 Jan - 06 Feb Spirit Airlines direct
25 Jan - 11 Feb Spirit Airlines direct
25 Jan - 09 Feb Spirit Airlines direct
25 Jan - 03 Feb Spirit Airlines direct
25 Jan - 10 Feb Spirit Airlines direct
25 Jan - 05 Feb Spirit Airlines direct
25 Jan - 14 Feb Spirit Airlines direct
23 Jan - 12 Feb Spirit Airlines direct

Also check the deals for one-way flights from Boston to San Juan in January.

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