UA645United Airlines · DEN → FSD
live · 6m ago
Route confirmed United Airlines

UA645 DenverDEN · 17:25 Sioux FallsFSD · 20:04

UA645 by United Airlines flies from Denver (DEN) to Sioux Falls (FSD) for the Mon, Oct 26 departure.

Right nowOn time · gate A24
17:25

departs DEN · on schedule

⚖ UA645 typically leaves +1 and lands −16. The air wins minutes back.
Typical gate push+1 minmedian posted departure
Typical arrival−16 minmedian over 9 operations
Wins back in air~17 minmedian gate push vs arrival · how planes make up time →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
10-26
−14 arrival
10-25
+4 gate · −14 arrival
10-24
−4 gate · −27 arrival
10-23
−1 gate · −17 arrival
10-22
+76 gate · +67 arrival
10-21
−3 gate · −16 arrival
10-20
+1 gate · −24 arrival

The bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.

The last 30 days

arrival outcome per operation

median arrival −16 min · 0 cancelled · 9 operations tracked

The route today

live boards
DENDenverOn-time likelyDEN delay board →
FSDSioux FallsHigh riskFSD delay board →
DEN→FSDevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
56%Chance of 15+ min delay
1.5%Chance of cancellation
+18 minAvg hub delay right now

Driven mainly by DEN (Denver), currently flying IFR (instrument). For this route and airline, under conditions like today's, over the last 90 days.

Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Denver to Sioux Falls flights today

same route · United Airlines
UA5397departs 07:40
UA5975departs 08:05
UA4759departs 10:00
UA4793departs 13:40
UA5378departs 13:40
UA5229departs 15:35

If UA645 is cancelled, these are the other United Airlines nonstop flights from Denver to Sioux Falls on the same day, with scheduled departure times in DEN local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →

How UA645 actually runs

Pro Flight Search has tracked every published board update for UA645 across the DEN and FSD boards: schedule changes, gate pushes and actual clocks. Usually lands ~10 min early. Based on 9 confirmed landings · 8/9 within 15 min of schedule. Pushes back late but makes up time in the air.

The verdict above is that record speaking, so it reflects how UA645 operates rather than what the timetable promises. Numbers refresh as new flights operate.

Technical record

How this operation is measured

board clocksaircraft

Board log

scheduled → actual, per operation
10-26DEN 17:25FSD 20:04 19:50 (−14)
10-25DEN 17:25 17:29 (+4)FSD 20:04 19:50 (−14)
10-24DEN 18:00 17:56 (−4)FSD 20:40 20:13 (−27)
10-23DEN 17:40 17:39 (−1)FSD 20:20 20:03 (−17)
10-22DEN 17:40 18:56 (+76)FSD 20:20 21:27 (+67)
10-21DEN 17:40 17:37 (−3)FSD 20:20 20:04 (−16)
10-20DEN 17:40 17:41 (+1)FSD 20:20 19:56 (−24)
10-19DEN 17:40 17:39 (−1)FSD 20:20 20:01 (−19)
10-18DEN 17:40 17:47 (+7)FSD 20:20 20:15 (−5)

Aircraft

Recent tails: N66897, N37298, N75425, N37474.

Board clocks recorded as DEN and FSD published them.

Planning around UA645? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — UA645 Denver to Sioux Falls on-time performance, measured from the DEN and FSD airport boards.

Canonical URL
https://proflightsearch.com/flight/UA645
How we measure this →