| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jan 05 | ORD | TYS | 15:05 | 17:06 |
Unknown
|
Track > |
| Jan 04 | ORD | TYS | 14:29 | 16:32 |
Landed
|
Track > |
| Jan 03 | ORD | TYS | 16:18 | 18:21 |
Delayed
|
Track > |
| Jan 02 | ORD | TYS | 14:10 | 16:12 |
Landed
|
Track > |
| Jan 01 | ORD | TYS | 14:51 | 16:50 |
Landed
|
Track > |
| Dec 31 | ORD | TYS | 15:04 | 17:02 |
Landed
|
Track > |
| Dec 30 | ORD | TYS | 15:33 | 17:33 |
Landed Late
|
Track > |
| Dec 29 | ORD | TYS | 17:20 | 17:00 |
Unknown
|
Track > |
| Dec 28 | ORD | TYS | 16:50 | 17:00 |
Unknown
|
Track > |
| Dec 27 | ORD | TYS | 14:41 | 16:43 |
Landed
|
Track > |
United Airlines Flight UA4521 connects Chicago, United States to Knoxville, United States, taking off from Chicago O'Hare International Airport ORD and landing at Knoxville McGhee Tyson Airport TYS.
How long is the UA4521 flight from Chicago to Knoxville?
The average flight time from Chicago to Knoxville is 1 hour and 1 minute. The flight distance is 765 km / 475 miles and the average flight speed is 683 km/h / 425 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA4521 Chicago to Knoxville?
The Airportia On-Time Performance Rating for United Airlines Flight UA4521 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA4521 arriving at?
Flight UA4521 arrives at Knoxville McGhee Tyson Airport (TYS) Terminal S.
When was the latest UA4521 flight?
The latest flight took off on Monday, January 5th, 2026 with the flight status being Unknown on 17:06.
How else can the flight UA4521 be referenced as?
This United Airlines flight can also be referenced as UAL4521, UA 4521, UAL 4521.
How often is flight UA4521 delayed?
On average, 40% of all UA4521 flights are delayed. The average delay is 30 minutes.
Can I get compensation for my delayed or cancelled UA4521 flight or baggage issues?
If your UA4521 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 UA4521 Flight Tracker above for more details.
Flight UA4521 is code-shared by 3 airlines using the flight numbers AC4513, NH7190, NZ2943
Other flights departing from Chicago ORD: AA5404, UA5279, UA2042, UA3491
Other flights arriving at Knoxville TYS: G43021, G43060, G41409, AA6095
All flights connecting Chicago ORD to Knoxville TYS.