$109 Cheap United flights Colorado Springs (COS) to Boston (BOS)

Use the “Price (lowest to highest)” filter on Expedia to find cheap United Airlines round-trip flights from $237 from COS to BOS. Affordable one-way options from $109 are available too.**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.

Look for one-way or return flights to Boston in January or February. You could find a cheap fare with United Airlines during these off-peak months.

Look for cheap United Airlines flights from Colorado Springs Airport (COS) to Logan Intl. Airport (BOS) one to three months ahead of your day of departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare class and itinerary, the ideal day to book a domestic flight is usually Sunday and the most expensive day tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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 see if there’s a direct route from COS to BOS with United Airlines or other airlines, use our “Nonstop” filter when searching for tickets.

Filter your results by “Morning” and “Early Morning” to find the earliest departures from COS to BOS. Taking off early means you’re 20% less likely to experience cancellations.**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.

Hop on a United Airlines flight from Colorado Springs Airport (COS) to Boston, and you’ll likely touch down at Logan Intl. Airport (BOS). This is the airline’s primary hub in this destination.

A rewarding loyalty program and the opportunity to collect points through United Mileage Plus are the start of the reasons to fly from COS to BOS with United Airlines. Plus, when you join our One Key™ program, you can receive OneKeyCash™* in addition to United Airlines’s loyalty program earnings. It’s yours to spend on your next adventure.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Depending on the type of ticket you purchased, a fee is typically charged if you change or cancel your booking more than 24 hours after it’s been confirmed. To find flexible plane tickets, select our “Changes included” and “No cancel fee” boxes when you look for flights. For additional information on changing or canceling your reservation, go to “Trips,” select your flight and click on “Manage Booking.”