Denver (DEN) to Boston (BOS) flight deal from $172 USD in economy class

UAUnited Airlines

Round Trip•Economy

DEN

Denver International Airport

Denver, United States

BOS

Logan International Airport

Boston, United States

$290 USD

-41%$172 USD

Verified Nov 29, 2025 at 5:30 AM

December 2025

Today

Mon

Tue

Wed

Thu

Fri

Sat

Sun

1$327 2$262 3$262 4$262 5$257 6$257 7$257 8$257 9$257 10$257 11$257 12$197 13$277 14$277 15$277 16$277 17$273 18$199 19$270 20$244 21$221 22$244 23$244 24$172 25$172 26$217 27$354 28$217 29$217 30$228 31$204 1$277 2$356 3$572 4$307

Rare Availability

5% of dates checked are available within 10% of the lowest price

Friday, December 19th, 2025

10 round-trip options

Returning

Wed, Dec 24, 2025•5 Day Trip

$356 USD

Google Flights

Returning

Thu, Dec 25, 2025•6 Day Trip

$523 USD

Google Flights

Returning

Fri, Dec 26, 2025•7 Day Trip

$693 USD

Google Flights

Returning

Sat, Dec 27, 2025•8 Day Trip

$956 USD

Google Flights

Returning

Sun, Dec 28, 2025•9 Day Trip

$772 USD

Google Flights

Returning

Mon, Dec 29, 2025•10 Day Trip

$527 USD

Google Flights

Returning

Tue, Dec 30, 2025•11 Day Trip

$482 USD

Google Flights

Returning

Wed, Dec 31, 2025•12 Day Trip

$343 USD

Google Flights

Returning

Thu, Jan 1, 2026•13 Day Trip

$270 USD

Google Flights

Returning

Fri, Jan 2, 2026•14 Day Trip

$273 USD

Google Flights