United Airlines UA521 Flight Status
According to Trip.com real-time data, the UA521 flight operated by United Airlines on Oct 28, 2026 is scheduled to fly from Atlanta (ATL) to Boston (BOS). The flight is expected to depart at 3:57 PM and land at 11:25 PM .
Tue, Oct 27
Wed, Oct 28
Thu, Oct 29
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Arrived
The flight has arrived 27m late
3h 50m
Check-in Counter
--
Boarding Gate
E2
Arrival Gate
B28
Baggage
6
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Scheduled
Your flight will depart on time.
7h 28m
IAH
2h 5m
Check-in Counter
--
Boarding Gate
T19
Arrival Gate
B28
Baggage
6
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Scheduled
Your flight will depart on time.
7h 28m
IAH
1h 14m
Check-in Counter
--
Boarding Gate
--
Arrival Gate
--
Baggage
6
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United Airlines From $198
Search flights Information provided by VariFlight For real-time updates, please check airport displays or contact your airline. You can also explore more flights from Atlanta to Boston or track other flights with our flight status tracker.
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UA1746
|
Houston (HOU)
Atlanta (ATL)
Atlanta (ATL)
Scheduled: 3:01 PM
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UA521 Aircraft Details
According to Trip.com real-time data, the UA521 flight flying from Atlanta to Boston on 10/28/2026 is operated by the aircraft model Airbus A320. This aircraft has been in service for 30y, 5m. The aircraft is equipped with 150 seats.
Airbus A320
Punctuality (Departure)
58
%
Punctuality (Arrival)
89
%
Early on average
4 minutes
Age
30y, 5m
Seats
150
Flight Distance
--
Economy
First
Premium Economy
In-Flight Services
None
Entertainment available, please bring your own device
Wi-Fi is available
No power outlets are available
Seat Information
76 cm
More legroom than on 3% of flights
43 cm
Seat width
100°
Reclining Angle
3-3
Seat layout example
In-Flight Services
Snacks
Entertainment available, please bring your own device
Wi-Fi is available
Power outlet
Seat Information
99 cm
More legroom than on 25% of flights
48 cm
Seat width
120°
Reclining Angle
2-2
Seat layout example
In-Flight Services
None
Entertainment available, please bring your own device
Wi-Fi is available
Power outlet
Seat Information
89 cm
More legroom than on 76% of flights
43 cm
Seat width
110°
Reclining Angle
3-3
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 27 from ATL at approximately 7:55 PM. This flight is expected to arrrive in BOS at 11:52 PM.
| Date | Airport | Aircraft Model | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Fri, Oct 23 | Houston (IAH) | Boston (BOS) | B39M | 7:05 PM | 11:36 PM | Arrived |
| Sat, Oct 24 | Houston (IAH) | Orlando (MCO) | B39M | 8:39 AM | 11:34 AM | Arrived |
| Sun, Oct 25 | Atlanta (ATL) | Boston (BOS) | B38M | 4:20 PM | 11:29 PM | Arrived |
| Mon, Oct 26 | Atlanta (ATL) | Boston (BOS) | 738 | 4:45 PM | 1:54 AM | Arrived |
| Tue, Oct 27 | Houston (IAH) | Boston (BOS) | 738 | 7:55 PM | 11:52 PM | Arrived |
| Wed, Oct 28 | Atlanta (ATL) | Boston (BOS) | 320 | 3:57 PM | 11:25 PM | Scheduled |
| Thu, Oct 29 | Atlanta (ATL) | Boston (BOS) | 320 | 3:57 PM | 11:25 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 58% (Late on average 46 minutes), and the on-time arrival rate is 89% (Early on average 4 minutes).
On-Time Departures
Punctuality
58
%
Late on average
46 minutes
Early
0
%
On time
58
%
30 mins late
11
%
60 mins late
21
%
90 mins late
11
%
Canceled
0
%
On-Time Arrivals
Punctuality
89
%
Early on average
4 minutes
Early
68
%
On time
21
%
30 mins late
0
%
60 mins late
5
%
90 mins late
5
%
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 3:57 PM, arrival 11:25 PM (updated Oct 28, 2026).Is flight ua521 on time today?
Flight ua521 has not departed yet and is currently on schedule. Scheduled departure is 3:57 PM, with arrival at 11:25 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 3:57 PM. The latest actual or estimated departure time is 3:57 PM, and the current status is Scheduled (updated Oct 28, 2026).When is flight ua521 scheduled to arrive?
Flight ua521 is scheduled to arrive at 11:25 PM. The latest estimated or actual arrival time is 11:25 PM. Status is Scheduled as of Oct 28, 2026.What is the gate information for flight ua521?
For flight ua521, the departure terminal is D and the boarding gate is T19. Gate assignments can change at short notice—confirm on airport screens before heading to security.What is the baggage carousel number for flight ua521?
After arrival, baggage for flight ua521 is expected at carousel 6 in terminal B. Carousel numbers are assigned close to landing and may change—follow airport signs on arrival.What route does flight ua521 fly?
Flight ua521 is operated by United Airlines from Atlanta (ATL) to Boston (BOS). Typical flight time is about 7 hours28 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 28, 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 Atlanta?
Flight ua521 has not departed from Atlanta (ATL) yet and is currently on schedule for 3:57 PM.What is the seat configuration for flight ua521?
Flight ua521 usually flies a Airbus A320 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: Atlanta 23:25
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