| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Feb 07 | STL | IAH | 16:49 | 18:46 |
Landed
|
Track > |
| Jan 31 | STL | IAH | 16:47 | 18:21 |
Landed
|
Track > |
| Jan 24 | STL | IAH | 16:42 | 19:10 |
Cancelled
|
Track > |
| Claim > | ||||||
| Jan 17 | STL | IAH | 18:06 | 19:50 |
Landed Late
|
Track > |
| Jan 10 | STL | IAH | 16:51 | 18:54 |
Landed
|
Track > |
United Airlines Flight UA521 connects St. Louis, United States to Houston, United States, taking off from St. Louis Lambert International Airport STL and landing at Houston George Bush Intercontinental Airport IAH.
How long is the UA521 flight from St. Louis to Houston?
The average flight time from St. Louis to Houston is 1 hour and 49 minutes. The flight distance is 1076 km / 668 miles and the average flight speed is 564 km/h / 350 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA521 St. Louis to Houston?
The Airportia On-Time Performance Rating for United Airlines Flight UA521 is 4.9/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA521 arriving at?
Flight UA521 arrives at Houston George Bush Intercontinental Airport (IAH) Terminal E.
When was the latest UA521 flight?
The latest flight took off on Sunday, February 8th, 2026 with the flight status being Landed on 18:46.
How else can the flight UA521 be referenced as?
This United Airlines flight can also be referenced as UAL521, UA0521, UA 521, UAL 521.
How often is flight UA521 delayed?
On average, 20% of all UA521 flights are delayed. The average delay is 40 minutes.
Can I get compensation for my delayed or cancelled UA521 flight or baggage issues?
If your UA521 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 UA521 Flight Tracker above for more details.
Flight UA521 is code-shared by 2 airlines using the flight numbers NZ6912, VA8272
Other flights departing from St. Louis STL: AA3855, UA1229, AA3856, AA3659
Other flights arriving at Houston IAH: UA1293, UA1364, UA4037, AA3967
All flights connecting St. Louis STL to Houston IAH.