$123 Cheap United flights Denver (DEN) to Duluth (DLH)

Scoring cheap one-way United Airlines flights from DEN to DLH from $123 on Expedia couldn’t be easier — just filter by “Price (lowest to highest).” Alternatively, check out our budget-friendly round-trip fares from $227 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.

January is one of the cheapest months to jet off to Duluth with United Airlines. You could also find great deals on one-way and return fares in February.

Begin your search one to three months ahead of your travel date to find cheaper fares on United Airlines flights from Denver Intl. Airport (DEN) to Duluth Intl. Airport (DLH). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it’s 6% cheaper on average than a Monday, the most expensive day to book.* Nail your timing, and you can enjoy significant savings on domestic flights.*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 trip from DEN to DLH with United Airlines or other airlines, check the “Nonstop” filter when searching for flights.

Filter your results by “Morning” and “Early Morning” to find the earliest flights from DEN to DLH. Heading off early means flight 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.

Board a United Airlines flight from Denver Intl. Airport (DEN) to Duluth, and you’ll likely touch down at Duluth Intl. Airport (DLH). This is the airline’s primary hub in this city.

Fly from DEN to DLH with United Airlines and you can look forward to a range of perks including a rewarding loyalty program. When you book through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to spend on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are generally free within 24 hours of making your booking, but your airline may charge you after that time. For more information about altering your reservation, check out your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to make changes without being charged, apply the “Changes included” and “No cancel fee” filters when organizing your next getaway.