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

Return flights

07 Dec - 11 Dec	Delta
09 Dec - 21 Dec	Delta
15 Dec - 18 Dec	United
02 Dec - 06 Dec	United
02 Dec - 03 Dec	Spirit Airlines
02 Dec - 04 Dec	Spirit Airlines
02 Dec - 11 Dec	Spirit Airlines
07 Dec - 12 Dec	Spirit Airlines
02 Dec - 12 Dec	Spirit Airlines
05 Dec - 11 Dec	Spirit Airlines
31 Dec - 08 Jan	United
30 Dec - 07 Jan	Aeromexico
31 Dec - 05 Jan	Aeromexico
31 Dec - 13 Jan	Spirit Airlines
31 Dec - 12 Jan	Spirit Airlines
31 Dec - 14 Jan	Spirit Airlines
29 Dec - 06 Jan	Frontier Airlines
13 Dec - 05 Jan	Spirit Airlines
19 Dec - 05 Jan	jetBlue
31 Dec - 20 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