UA645: United flight 645
Denver (DEN) → Sioux Falls (FSD) · departs 5:40p, lands 8:20p local · Mon, Tue, Wed, Thu, Fri, Sun
The timetable below has every scheduled departure; for today's flight, check United.
An estimate from the published timetable, not live tracking: it cannot know about delays, diversions or cancellations.
Live status at United →The route
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UA645 timetable
Published departure and arrival times, each in its airport's local time, from the flights we sampled Oct 14–20.
| Route | Departs | Arrives | Scheduled | Days |
|---|---|---|---|---|
| DEN → FSDDenver to Sioux Falls | 5:40p | 8:20p | 1h40m | Mon, Tue, Wed, Thu, Fri, Sun |
| DEN → FSDDenver to Sioux Falls | 5:59p | 8:39p | 1h40m | Sat |
Other nonstops from Denver to Sioux Falls
The departures either side of UA645. Times are Denver time.
| Flight | Departs | Days |
|---|---|---|
| United | 10:00a | Daily |
| United | 1:40p | Daily |
| United | 3:35p | Mon, Wed, Thu, Fri, Sun |
| This flight UA645 | 5:40p | Mon, Tue, Wed, Thu, Fri, Sun |
| United | 9:04p | Daily |
All 6 flights from DEN to FSD, by time →
Flying back from Sioux Falls
United flies Sioux Falls to Denver nonstop 39 times a week, from 6:00a to 6:50p: 9:42a UA1849 · every nonstop FSD → DEN →
How UA645 ran in our sample
6 of 7 departures left within 15 minutes of schedule (Oct 14–20). Only flights that departed are counted: cancellations are not in our data.
Aircraft: Boeing 737-900 on 7 of 7.
What time does UA645 leave Denver?
UA645 is scheduled to depart Denver (DEN) at 5:40p (Mon, Tue, Wed, Thu, Fri, Sun), 5:59p (Sat), Denver time, and to land in Sioux Falls (FSD) at about 8:20p local time, a scheduled 1h40m. Times are the published ones from the flights we sampled Oct 14–20; check United for today's.
What plane is UA645?
Boeing 737-900 on 7 of the 7 UA645 flights from DEN we sampled Oct 14–20. Airlines swap aircraft, so the plane on a given day can differ.
Does UA645 fly every day?
Yes — UA645 flew Denver to Sioux Falls every day of the week we sampled (Oct 14–20).
Is UA645 usually on time?
Of 7 UA645 departures from DEN we sampled Oct 14–20, 6 left within 15 minutes of the scheduled time. That counts only flights that departed — cancellations are not in our data — and one week is a small sample, so treat it as a hint, not a rating.
More United flights from Denver
Timetable from United departures we observed; UA645 is a United Airlines flight number, and Hop Nonstop is not affiliated with United. Schedules change — confirm with the airline before you travel.