AirHint found the following cheapest return flights from Boston (BOS) to Cancun (CUN) in December 2025 (see full year).

Return flights

09 Dec - 10 Dec	Spirit Airlines
07 Dec - 12 Dec	United
05 Dec - 13 Dec	Delta
07 Dec - 10 Dec	Spirit Airlines
04 Dec - 10 Dec	Spirit Airlines
09 Dec - 12 Dec	Spirit Airlines
03 Dec - 10 Dec	Southwest Airlines
04 Dec - 12 Dec	Spirit Airlines
04 Dec - 07 Dec	Spirit Airlines
12 Dec - 15 Dec	Frontier Airlines
30 Dec - 10 Jan	Spirit Airlines
27 Dec - 05 Jan	jetBlue
30 Dec - 11 Jan	Spirit Airlines
26 Dec - 10 Jan	Spirit Airlines
26 Dec - 11 Jan	Spirit Airlines
21 Dec - 01 Jan	Delta	direct
23 Dec - 10 Jan	Spirit Airlines
23 Dec - 11 Jan	Spirit Airlines

Also check the deals for one-way flights from Boston to Cancun in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Boston to Cancun in December from 256€

Return flights