American Airlines and United have round-trip flights from Dallas (DFW) to Tulum (TQO) for $243-$265, NONSTOP or with connections. Flights May to February. Departures on Monday, Tuesday, Wednesday, Thursday, and Sunday. No Fridays or Saturdays. Very few extended weekends available. Origin/Destination reversible.
United and American have round-trip flights from Dallas (DFW) to Tulum (TQO) for $251-$282, Nonstop or with a connection. Flights July to February. Departures on Monday, Tuesday, Wednesday, Thursday, and Sunday. No Fridays or Saturdays. Extended weekends available. Origin/Destination reversible.
Flight may be on mixed carriers: United outbound / American inbound.
American Airlines has round-trip flights from Dallas (DFW) to Tulum (TQO) for $242-$322, NONSTOP. Flights March to December. Extended weekends available. Origin/Destination reversible. No Christmas dates available.
Cheapest ($242) fares are from August to December.
A Carry-on bag and also a personal item is allowed for free on American. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.