$161 Cheap United flights Boston (BOS) to Cancun (CUN)

Scoring cheap one-way United Airlines flights from BOS to CUN from $161 on Expedia is simple — just filter by “Price (lowest to highest).” Or check out our affordable return fares from $331 for your next break.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Browse for one-way or round-trip flights to Cancun in October or September. You could find a cheap fare with United Airlines during these off-season months.

Look for United Airlines flights from BOS to CUN about one month before you want to go. The cheapest time to reserve an international flight is generally 18 to 29 days ahead of your departure date when you can save 17% versus booking four to five months in advance. Regardless of fare class and itinerary, the best day to book international airfare is usually Sunday. Friday is often the most expensive. Travelers who book on a Sunday can save 17% on average compared to those who book on a Friday.**Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC’s global airline sales database.

To figure out if there’s a direct journey from BOS to CUN with United Airlines or any other airlines, use our “Nonstop” filter when browsing for flights.

To find the earliest departures from BOS to CUN with United Airlines, filter your results by “Morning” and “Early Morning.” Booking an early flight generally means cancellations are less likely.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG’s global flight data platform.

United Airlines flights from Logan Intl. Airport (BOS) to Cancun touch down at Cancun Intl. Airport (CUN). This is the main gateway here.

A rewarding loyalty program and the opportunity to collect points through United Mileage Plus are the start of the reasons to depart from BOS to CUN with United Airlines. Plus, when you sign up to Expedia’s free One Key™ program, you can earn OneKeyCash™* on top of any airline loyalty program earnings. It’s yours to use wherever your next trip takes you.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are often free within 24 hours of booking, but your airline may charge you after that. For more information about modifying your flights, go to your “Trips,” select your flight and click on “Manage Booking.” If you want the freedom to make changes without being charged, tick the “No cancel fee” or “Changes included” filter when planning your next trip.