| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Mar 28 | TYS | IAH | 09:53 | 10:55 |
Landed
|
Track > |
| Mar 27 | TYS | IAH | 09:04 | 09:51 |
Landed
|
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| Mar 26 | TYS | IAH | 09:05 | 09:52 |
Landed
|
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| Mar 25 | TYS | IAH | 09:14 | 09:59 |
Landed
|
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| Mar 24 | TYS | IAH | 09:07 | 10:01 |
Landed
|
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| Mar 23 | TYS | IAH | 09:02 | 09:55 |
Landed
|
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| Mar 22 | TYS | IAH | 09:13 | 10:13 |
Landed
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| Mar 21 | TYS | IAH | 09:09 | 09:58 |
Landed
|
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| Mar 20 | TYS | IAH | 09:03 | 09:46 |
Landed
|
Track > |
| Mar 19 | TYS | IAH | 09:22 | 10:07 |
Landed
|
Track > |
United Airlines Flight UA4251 connects Knoxville, United States to Houston, United States, taking off from Knoxville McGhee Tyson Airport TYS and landing at Houston George Bush Intercontinental Airport IAH.
How long is the UA4251 flight from Knoxville to Houston?
The average flight time from Knoxville to Houston is 1 hour and 50 minutes. The flight distance is 1240 km / 771 miles and the average flight speed is 676 km/h / 420 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA4251 Knoxville to Houston?
The Airportia On-Time Performance Rating for United Airlines Flight UA4251 is 5/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA4251 arriving at?
Flight UA4251 arrives at Houston George Bush Intercontinental Airport (IAH) Terminal B.
When was the latest UA4251 flight?
The latest flight took off on Saturday, March 28th, 2026 with the flight status being Landed on 10:55.
How else can the flight UA4251 be referenced as?
This United Airlines flight can also be referenced as UAL4251, UA 4251, UAL 4251.
How often is flight UA4251 delayed?
On average, 10% of all UA4251 flights are delayed. The average delay is 10 minutes.
Can I get compensation for my delayed or cancelled UA4251 flight or baggage issues?
If your UA4251 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 UA4251 Flight Tracker above for more details.
Flight UA4251 is code-shared by 1 airline using the flight number NZ6668
Other flights departing from Knoxville TYS: WN4584, G43046, AA5785, G41424
Other flights arriving at Houston IAH: UA573, UA1361, UA2214, UA6283
All flights connecting Knoxville TYS to Houston IAH.