Right now, November/2019 and May/2020 are the most affordable months to take a flight to Cancun.
JetBlue, Delta, Southwest, United, American Airlines, Aeromexico and Interjet fly non-stop from the United States of America to Cancun.
American Airlines is the cheapest airline to fly to Cancun from the United States of America.
Air Canada is the best airline to fly to Cancun from the United States of America. If you would like non-stop flights then JetBlue is the best.