AirHint found the following cheapest one-way flights from Boston (BOS) to Cancun (CUN) in September 2025 (see full year).

One-Way flights

03 Sep	Spirit Airlines
16 Sep	Spirit Airlines
09 Sep	Spirit Airlines
02 Sep	Spirit Airlines
13 Sep	Spirit Airlines
06 Sep	Spirit Airlines
23 Sep	Spirit Airlines
01 Sep	Spirit Airlines
15 Sep	Southwest Airlines
17 Sep	Spirit Airlines

Also check the deals for return flights from Boston to Cancun in September.

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 one-way flights from Boston to Cancun in September from 83€

One-Way flights