| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jul 17 | IAH | BOS | 18:27 | 22:52 |
Landed
|
Track > |
| Jul 16 | IAH | BOS | 19:00 | 23:13 |
Landed
|
Track > |
| Jul 15 | IAH | BOS | 19:25 | 23:43 |
Landed Late
|
Track > |
| Jul 14 | IAH | BOS | 18:58 | 23:31 |
Landed
|
Track > |
| Jul 13 | IAH | BOS | 21:26 | 01:54 |
Delayed
|
Track > |
| Jul 12 | IAH | BOS | 18:50 | 23:17 |
Landed
|
Track > |
| Jul 10 | IAH | BOS | 18:34 | 22:43 |
Landed
|
Track > |
| Jul 09 | IAH | BOS | 18:39 | 23:09 |
Landed
|
Track > |
| Jul 08 | IAH | BOS | 18:33 | 22:54 |
Landed
|
Track > |
| Jul 07 | IAH | BOS | 21:48 | 02:02 |
Delayed
|
Track > |
United Airlines Flight UA521 connects Houston, United States to Boston, United States, taking off from Houston George Bush Intercontinental Airport IAH and landing at Boston Logan International Airport BOS.
How long is the UA521 flight from Houston to Boston?
The average flight time from Houston to Boston is 3 hours and 21 minutes. The flight distance is 2567 km / 1595 miles and the average flight speed is 764 km/h / 475 mph.
How many UA521 flights are operated per week?
6 flights per week. The flight UA521 is operated on Monday, Tuesday, Wednesday, Thursday, Friday and Sunday.
What is the On-Time Performance (OTP) of United Airlines Flight UA521 Houston to Boston?
The Airportia On-Time Performance Rating for United Airlines Flight UA521 is 4.5/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA521 arriving at?
Flight UA521 arrives at Boston Logan International Airport (BOS) Terminal B.
When was the latest UA521 flight?
The latest flight took off on Saturday, July 18th, 2026 with the flight status being Landed on 22:52.
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, 40% of all UA521 flights are delayed. The average delay is 80 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 1 airline using the flight number NZ6393
Other flights departing from Houston IAH: QR714, UA4035, UA5359, UA6353
Other flights arriving at Boston BOS: AA567, AA2224, DL888, B6506
All flights connecting Houston IAH to Boston BOS.