United Airlines UA645 Flight Status
Based on Trip.com’s real-time data, the UA645 flight operated by United Airlines on Sep 22, 2026 is scheduled to fly from Denver (DEN) to Sioux Falls (FSD). The flight is expected to depart at 17:30 (local time in Denver, UTC-6) and land at 19:36 (local time in Sioux Falls, UTC-5) .
Mon, Sep 21
Tue, Sep 22
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Scheduled
Your flight will depart on time.
1h 37m
Check-in Counter
7,8
Boarding Gate
B24
Arrival Gate
7
Baggage
1
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Scheduled
Your flight will depart on time.
1h 37m
Check-in Counter
7,8
Boarding Gate
B45
Arrival Gate
--
Baggage
1
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Information provided by VariFlight For the latest updates, please refer to airport announcements or consult your airline. You can also explore more flights from Denver to Sioux Falls or track other flights with our flight status tracker.
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UA250
|
Knoxville (TYS) 
Denver (DEN)
Denver (DEN)Scheduled: 18:10
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UA645 Aircraft Details
According to Trip.com real-time data, the UA645 flight flying from Denver to Sioux Falls on 9/22/2026 is operated by the aircraft model Airbus A320. This aircraft has been in service for 26y, 10m. The aircraft is equipped with 150 seats.
Airbus A320
Punctuality (Departure)
67%
Punctuality (Arrival)
73%
Late on average
18 minutes
Age
26y, 10m
Seats
150
Distance
--
Economy
First
Premium Economy
Onboard Amenities
Snacks
On-demand entertainment
Wi-Fi (additional charge)
Unknown
Seating Plan
76 cm
Legroom
43 cm
Seat width
100°
Reclining Angle
3-3
Seat layout example
Onboard Amenities
Snacks
On-demand entertainment
Wi-Fi (additional charge)
Power outlet
Seating Plan
99 cm
More legroom than on 83% of flights
48 cm
Seat width
120°
Reclining Angle
2-2
Seat layout example
Onboard Amenities
Snacks
Entertainment available, please bring your own device
Wi-Fi is available
Power outlet
Seating Plan
89 cm
More legroom than on 83% of flights
43 cm
Seat width
110°
Reclining Angle
3-3
Seat layout example
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Flight History for UA645
Trip.com historical records show that the last UA645 flight departed on Mon, Sep 21 from DEN at approximately 17:30. This flight is expected to arrrive in FSD at 19:36.
| Date | Airport | Aircraft Type | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Wed, Sep 16 | Denver (DEN) | Sioux Falls (FSD) | 320 | 17:45 | 19:49 | Arrived |
| Thu, Sep 17 | Denver (DEN) | Sioux Falls (FSD) | 320 | 17:40 | 19:51 | Arrived |
| Fri, Sep 18 | Denver (DEN) | Sioux Falls (FSD) | 320 | 19:45 | 21:53 | Arrived |
| Sat, Sep 19 | Denver (DEN) | Sioux Falls (FSD) | 320 | 17:52 | 20:04 | Arrived |
| Sun, Sep 20 | Denver (DEN) | Sioux Falls (FSD) | 320 | 17:41 | 19:49 | Arrived |
| Mon, Sep 21 | Denver (DEN) | Sioux Falls (FSD) | 320 | 17:30 | 19:36 | Scheduled |
| Tue, Sep 22 | Denver (DEN) | Sioux Falls (FSD) | 320 | 17:30 | 19:36 | Scheduled |
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UA645 On-Time Performance
Based on the average performance of this flight over the past 30 trips, the on-time departure rate of UA645 is 67% (Late on average 49 minutes), and the on-time arrival rate is 73% (Late on average 18 minutes).
On-Time Departures
Punctuality
67%
Late on average 49 minutes
Early
0%
On time
67%
30 mins late
7%
60 mins late
10%
90 mins late
17%
Cancelled
0%
On-Time Arrivals
Punctuality
73%
Late on average 18 minutes
Early
67%
On time
7%
30 mins late
10%
60 mins late
3%
90 mins late
13%
Cancelled
0%
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Cheap Return Flights to Denver
- Fri, Oct 2Sioux Falls (FSD)Denver (DEN)
Frontier AirlinesOne way53% offUS$232US$110 - Mon, Oct 5Sioux Falls (FSD)Denver (DEN) Frontier AirlinesOne way52% offUS$232US$111
- Mon, Sep 28Sioux Falls (FSD)Denver (DEN) Frontier AirlinesOne way44% offUS$232US$131
- Fri, Sep 25Sioux Falls (FSD)Denver (DEN) Frontier AirlinesOne way44% offUS$232US$131
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American AirlinesOne way36% offUS$232US$149 - Wed, Oct 21Sioux Falls (FSD)Denver (DEN) American AirlinesOne way20% offUS$232US$185
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Frequently Asked Questions
What is the current status of flight ua645?
Flight ua645 has not departed yet and is currently on schedule. Scheduled departure 17:30, arrival 20:07 (updated Sep 22, 2026).Is flight ua645 on time today?
Flight ua645 has not departed yet and is currently on schedule. Scheduled departure is 17:30, with arrival at 20:07. Recheck gate and timing before you head to the airport.Has flight ua645 departed yet? What is the departure time?
Flight ua645 is scheduled to depart at 17:30. The latest actual or estimated departure time is 17:30, and the current status is Scheduled (updated Sep 22, 2026).When is flight ua645 scheduled to arrive?
Flight ua645 is scheduled to arrive at 20:07. The latest estimated or actual arrival time is 19:36. Status is Scheduled as of Sep 22, 2026.What route does flight ua645 fly?
Flight ua645 is operated by United Airlines from Denver (DEN) to Sioux Falls (FSD). Typical flight time is about 1 hour37 minutes; operating days may include Tuesday.How can I check real-time status for flight ua645?
Track flight ua645 on this Trip.com status page for live departure, arrival, gate and baggage updates. For push alerts on the go, open the same flight in the Trip.com App and turn on flight notifications.If flight ua645 is delayed or canceled, what should I do?
If ua645 is delayed or canceled, first confirm the latest status here (Scheduled, updated Sep 22, 2026). Contact United Airlines or your booking channel for rebooking or refund options, and check Trip.com Manage Booking if you booked on Trip.com.Has flight ua645 departed from Denver?
Flight ua645 has not departed from Denver (DEN) yet and is currently on schedule for 17:30.What is the seat configuration for flight ua645?
Flight ua645 usually flies a Airbus A320 with seat layout 3-3. Layouts can differ by aircraft subtype and cabin product—confirm your seat map in Manage Booking after you purchase.
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Destination Info: Sioux Falls Weather & Time
Partly clear with showers
|
10°C - 14°C
Expected weather conditions upon arrival
1 hour time difference
Time on arrival: Denver 18:36| Sioux Falls 19:36
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