United Airlines
UA521 Flight Status
According to Trip.com real-time data, the UA521 flight operated by United Airlines on Oct 7, 2026 is scheduled to fly from Houston (IAH) to Boston (BOS). The flight is expected to depart at 6:35 PM (local time in Houston, UTC-5) and land at 11:39 PM (local time in Boston, UTC-4) .
Tue, Oct 6
Wed, Oct 7
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Scheduled
Your flight will depart on time.
4h 4m
Check-in Counter
--
Boarding Gate
C42
Arrival Gate
B25
Baggage
6
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Scheduled
Your flight will depart on time.
4h 4m
Check-in Counter
--
Boarding Gate
--
Arrival Gate
--
Baggage
--
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United Airlines
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Information provided by VariFlight
For real-time updates, please check airport displays or contact your airline.
You can also explore more flights from Houston to Boston or track other flights with our flight status tracker.
UA521 Aircraft Details
According to Trip.com real-time data, the UA521 flight flying from Houston to Boston on 10/7/2026 is operated by the aircraft model Boeing 737-900. This aircraft has been in service for 5y, 8m. The aircraft is equipped with 179 seats.
Boeing 737-900
Punctuality (Departure)
50
%
Punctuality (Arrival)
73
%
Late on average
19 minutes
Age
5y, 8m
Seats
179
Flight Distance
--
Economy
First
Premium Economy
In-Flight Services
None
On-demand entertainment
Wi-Fi (additional charge)
Power outlet
Seat Information
--
Legroom
--
Seat width
100°
Reclining Angle
3-3
Seat layout example
In-Flight Services
Meal included
On-demand entertainment
Wi-Fi (additional charge)
Power outlet
Seat Information
94 cm
Legroom
51 cm
Seat width
120°
Reclining Angle
2-2
Seat layout example
In-Flight Services
Meal included
Entertainment available, please bring your own device
Wi-Fi is available
Power outlet
Seat Information
--
Legroom
--
Seat width
105°
Reclining Angle
--
Seat layout example
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Flight History for UA521
Trip.com historical records show that the last UA521 flight departed on Tue, Oct 6 from IAH at approximately 6:35 PM. This flight is expected to arrrive in BOS at 10:54 PM.
| Date | Airport | Aircraft Model | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Thu, Oct 1 | Houston (IAH) | Boston (BOS) | B39M | 7:38 PM | 11:52 PM | Arrived |
| Fri, Oct 2 | Houston (IAH) | Boston (BOS) | B39M | 7:50 PM | 11:54 PM | Arrived |
| Sat, Oct 3 | Houston (IAH) | Orlando (MCO) | B38M | 8:41 AM | 11:39 AM | Arrived |
| Sun, Oct 4 | Houston (IAH) | Boston (BOS) | B39M | 8:22 PM | 12:14 AM | Arrived |
| Mon, Oct 5 | Houston (IAH) | Boston (BOS) | B39M | 8:26 PM | 12:39 AM | Arrived |
| Tue, Oct 6 | Houston (IAH) | Boston (BOS) | B39M | 6:35 PM | 10:54 PM | Scheduled |
| Wed, Oct 7 | Houston (IAH) | Boston (BOS) | B39M | 6:35 PM | 11:39 PM | Scheduled |
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UA521 On-Time Performance
Based on the average performance of this flight over the past 30 trips, the on-time departure rate of UA521 is 50% (Late on average 1 hour5 minutes), and the on-time arrival rate is 73% (Late on average 19 minutes).
On-Time Departures
Punctuality
50
%
Late on average
1 hour5 minutes
Early
0
%
On time
50
%
30 mins late
10
%
60 mins late
13
%
90 mins late
27
%
Canceled
0
%
On-Time Arrivals
Punctuality
73
%
Late on average
19 minutes
Early
57
%
On time
17
%
30 mins late
10
%
60 mins late
3
%
90 mins late
13
%
Canceled
0
%
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Frequently Asked Questions
-
What is the current status of flight ua521?
Flight ua521 has not departed yet and is currently on schedule. Scheduled departure 6:35 PM, arrival 11:39 PM (updated Oct 7, 2026). -
Is flight ua521 on time today?
Flight ua521 has not departed yet and is currently on schedule. Scheduled departure is 6:35 PM, with arrival at 11:39 PM. Recheck gate and timing before you head to the airport. -
Has flight ua521 departed yet? What is the departure time?
Flight ua521 is scheduled to depart at 6:35 PM. The latest actual or estimated departure time is 6:35 PM, and the current status is Scheduled (updated Oct 7, 2026). -
When is flight ua521 scheduled to arrive?
Flight ua521 is scheduled to arrive at 11:39 PM. The latest estimated or actual arrival time is 11:39 PM. Status is Scheduled as of Oct 7, 2026. -
What route does flight ua521 fly?
Flight ua521 is operated by United Airlines from Houston (IAH) to Boston (BOS). Typical flight time is about 4 hours4 minutes; operating days may include Wednesday. -
How can I check real-time status for flight ua521?
Track flight ua521 on this Trip.com status page for live departure, arrival, gate and baggage updates. For push alerts on the go, open the same flight in the Trip.com App and turn on flight notifications. -
If flight ua521 is delayed or canceled, what should I do?
If ua521 is delayed or canceled, first confirm the latest status here (Scheduled, updated Oct 7, 2026). Contact United Airlines or your booking channel for rebooking or refund options, and check Trip.com Manage Booking if you booked on Trip.com. -
Has flight ua521 departed from Houston?
Flight ua521 has not departed from Houston (IAH) yet and is currently on schedule for 6:35 PM. -
What is the seat configuration for flight ua521?
Flight ua521 usually flies a Boeing 737-900 with seat layout 3-3. Layouts can differ by aircraft subtype and cabin product—confirm your seat map in Manage Booking after you purchase.
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Time on arrival: Houston 22:39
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