United has round-trip flights from Dallas (DFW) to Cozumel (CZM) for $235-$267 with a connection. Flights March to November. Weekends available. Origin/Destination reversible.
Change fees are waived, but United’s “Basic Economy” fares do not include a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.