$224 Cheap United flights Raleigh (RDU) to Duluth (DLH)

Scoring cheap one-way United Airlines flights from RDU to DLH from $224 on Expedia is easy — just filter by “Price (lowest to highest).” Alternatively, check out our affordable return fares from $248 for your next exciting vacation.**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 get away to Duluth with United Airlines. You could also find fantastic deals on return and one-way fares in February.

For cheap United Airlines fares from Raleigh - Durham Intl. Airport (RDU) to Duluth Intl. Airport (DLH), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also affect the price you pay. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking on a Sunday.**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.

Select our “Nonstop” filter when browsing for direct United Airlines flights from RDU to DLH. You can also compare other carriers servicing the same nonstop trip.

Sort your results by “Morning” and “Early Morning” to find the earliest departures from RDU to DLH. Leaving early means you’re 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.

Duluth Intl. Airport (DLH) is the primary Duluth hub for United Airlines flights from Raleigh - Durham Intl. Airport (RDU).

A rewarding loyalty program and the ability to collect points through United Mileage Plus are the start of the reasons to travel from RDU to DLH with United Airlines. Plus, when you sign up to Expedia’s free One Key™ program, you can earn OneKeyCash™* alongside United Airlines’s loyalty program earnings. You can put it toward your future trips.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.

Changes are usually free within 24 hours of making your booking, but your airline may add a charge after that. For further details about modifying your flights, check out your “Trips,” select your flight and click on “Manage Booking.” If you’d like the flexibility to adjust your plans without extra charges, apply the “Changes included” and “No cancel fee” filters when planning your next break.