$153 Cheap United flights St. Louis (STL) to Duluth (DLH)

Scoring cheap one-way United Airlines flights from STL to DLH from $153 on Expedia is simple — just filter by “Price (lowest to highest).” Or check out our affordable return fares from $243 for your next exciting getaway.**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 least expensive months to travel to Duluth with United Airlines. You could also find great prices on return and one-way tickets in February.

To find cheap United Airlines fares from Lambert-St. Louis Intl. Airport (STL) to Duluth Intl. Airport (DLH), start searching one to three months before your planned departure. Reserving 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 overall price. Sunday is generally the cheapest, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking your journey 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 looking for direct United Airlines flights from STL to DLH. It’s also a good way to compare other airlines servicing the same nonstop trip.

To find the earliest departures from STL to DLH with United Airlines, filter your results by “Early Morning” and “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.

Jump on a United Airlines flight from Lambert-St. Louis Intl. Airport (STL) to Duluth, and you’ll likely come in to Duluth Intl. Airport (DLH). This is the airline’s primary hub in this destination.

A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to depart from STL to DLH with United Airlines. Plus, by joining Expedia’s free One Key™ program, you can earn OneKeyCash™* alongside 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.

In most cases, you can reschedule or cancel your flight, although additional charges may apply if you booked over 24 hours ago. Want to keep your options open? Use Expedia’s “No cancel fee” and “Changes included” filters to find flights that won’t charge you extra if you have to alter your plans. To update your booking, go to “Trips,” select your flight and click on “Manage Booking” for more details.