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

One-Way flights

22 Sep	Spirit Airlines
27 Sep	Spirit Airlines
03 Sep	United
04 Sep	United
18 Sep	United
11 Sep	Southwest Airlines
10 Sep	Spirit Airlines
07 Sep	Spirit Airlines
15 Sep	Spirit Airlines
13 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 99€

One-Way flights