Round Trip Washington DC to Cancun Mexico Nonstop Airfares on United Airlines

United Airlines and Priceline have round trip airfares from Washington DC (IAD) to Cancun, Mexico (CUN) for $336. These are basic economy fares with no seat selection, no carry-on bag, and no changes allowed. A personal item that fits under the seat in front of you is permitted.

Travel Availability:

• Departures: August 20-31; September 1, 6-9, 11-16, 21-30; October 2-6, 11-14, 17-20, 24-27; November 1-3, 9-10, 14-17, 28-30; December 1, 5-8, 13-14; January 1-12, 17-20, 23-26, 29-31; February 1-2, 7-9, 16-17, 21-24, 26-28; March 1-3, 8-10, 16, 23
• Returns: August 27; September 1, 3, 5, 10, 15-19, 22-26, 29-30; October 1-3, 5-10, 14-16, 20-23, 27-31; November 4-5, 11-13, 18-20, 23-24; December 2-4, 9-11, 15-18, 20-25; January 12-15, 20-22, 27-29; February 2-5, 9-12; March 2-3, 5, 8-10, 16, 23, 31