Route guide

Denver to Sioux Falls (DEN-FSD): Nonstop Upgrade & Award Space

United Airlines and Frontier Airlines fly nonstop between Denver (DEN) and Sioux Falls (FSD), roughly 42 times a week. Because so many carriers compete on this route, premium seats turn over daily, and upgrade or award space can open and close within hours. 2LNR tracks confirmed availability on every DEN to FSD departure, so you know which flights have space before you book.

Data current as of July 21, 2026, refreshed on an ongoing basis as new schedules and seats are confirmed.

See DEN to FSD on the interactive map Get started free
42
Nonstop flights a week
484 mi
Nonstop distance
Free
To get started

Confirmed upgrade & award space on every DEN to FSD departure

2LNR tracks confirmed upgrade and award availability on American, Delta, and Alaska and across 30 airlines, segment by segment, date by date. Open the calendar for Denver to Sioux Falls to see which departures have real space, or watch the route and get alerted when space opens.

See real availability

Confirmed upgrade and award seats on each DEN to FSD departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See DEN to FSD on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Denver to Sioux Falls nonstop

Carriers operating DEN to FSD nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

  • United Airlines
  • Frontier Airlines
See DEN to FSD on the interactive map →

Frequently asked questions about DEN to FSD

How far is Sioux Falls from Denver?
DEN to FSD covers about 484 miles nonstop. Flight times vary by aircraft and season; each scheduled departure on this page lists its own times.
Which airlines fly nonstop from DEN to FSD?
United Airlines and Frontier Airlines fly the route nonstop. 2LNR tracks confirmed upgrade and award space on both of them.
How many flights a week are there from DEN to FSD?
About 42 nonstop flights a week run between Denver and Sioux Falls in the current schedule, operated by United Airlines and Frontier Airlines. Frequency shifts by season; the calendar on this page reflects what's currently scheduled.
How do I check upgrade or award availability on DEN to FSD?
Open the DEN to FSD calendar on this page to see confirmed upgrade and award space by date. You can also set an alert on the Denver to Sioux Falls route, and 2LNR will notify you when space opens. It's free to start.

Never miss DEN to FSD upgrade or award space

Track confirmed availability, set alerts, and book with confidence. Free to start, no credit card required.

Get started free