| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Mar 04 | SEA | DEN | 15:06 | 18:14 |
Landed
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| Mar 03 | SEA | DEN | 15:15 | 18:26 |
Landed
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| Mar 02 | SEA | DEN | 15:23 | 18:31 |
Landed
|
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| Mar 01 | SEA | DEN | 15:08 | 18:14 |
Landed
|
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| Feb 28 | SEA | DEN | 15:27 | 18:36 |
Landed
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| Feb 27 | SEA | DEN | 15:17 | 18:13 |
Landed
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| Feb 26 | SEA | DEN | 15:22 | 18:19 |
Landed
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| Feb 25 | SEA | DEN | 16:26 | 19:24 |
Delayed
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| Feb 24 | SEA | DEN | 15:19 | 18:17 |
Landed
|
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| Feb 23 | SEA | DEN | 15:20 | 18:21 |
Landed
|
Track > |
United Airlines Flight UA399 connects Seattle, United States to Denver, United States, taking off from Seattle Tacoma International Airport SEA and landing at Denver International Airport DEN.
How long is the UA399 flight from Seattle to Denver?
The average flight time from Seattle to Denver is 2 hours and 3 minutes. The flight distance is 1645 km / 1022 miles and the average flight speed is 803 km/h / 499 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA399 Seattle to Denver?
The Airportia On-Time Performance Rating for United Airlines Flight UA399 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest UA399 flight?
The latest flight took off on Thursday, March 5th, 2026 with the flight status being Landed on 18:14.
How else can the flight UA399 be referenced as?
This United Airlines flight can also be referenced as UAL399, UA0399, UA 399, UAL 399.
How often is flight UA399 delayed?
On average, 10% of all UA399 flights are delayed. The average delay is 46 minutes.
Can I get compensation for my delayed or cancelled UA399 flight or baggage issues?
If your UA399 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our UA399 Flight Tracker above for more details.
Flight UA399 is code-shared by 2 airlines using the flight numbers CM1286, NH7376
Other flights departing from Seattle SEA: DL1520, WN1513, AS346, DL1584
Other flights arriving at Denver DEN: UA1048, UA1153, UA2171, WN1061
All flights connecting Seattle SEA to Denver DEN.