United Airlines UA521 Flight Status
According to Trip.com real-time data, the UA521 flight operated by United Airlines on May 18, 2026 is scheduled to fly from Atlanta (ATL) to Boston (BOS). The flight is expected to depart at 15:57 and land at 23:35 .
Sun, May 17
Mon, May 18
Tue, May 19
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Scheduled
Your flight will depart on time.
7h 38m
IAH
1h 12m
Check-in Counter
--
Boarding Gate
--
Arrival Gate
--
Baggage
--
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Scheduled
Your flight will depart on time.
7h 38m
IAH
1h 12m
Check-in Counter
--
Boarding Gate
--
Arrival Gate
--
Baggage
--
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Scheduled
Your flight will depart on time.
7h 38m
IAH
1h 12m
Check-in Counter
--
Boarding Gate
--
Arrival Gate
--
Baggage
--
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Information provided by VariFlight. Please refer to airport announcements for the most up-to-date information. If this is not your flight, you can browse more options for flights from Atlanta to Boston to find your schedule.
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UA1746
|
Houston (HOU) 
Atlanta (ATL)
Atlanta (ATL)Scheduled: 15:01
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UA521 Aircraft Details
According to Trip.com real-time data, the UA521 flight flying from Atlanta to Boston on 5/18/2026 is operated by the aircraft model Boeing 737-700. This aircraft has been in service for 1y, 8m. The aircraft is equipped with Up to 148 seats.
Boeing 737-700
Punctuality (Departure)
70%
Punctuality (Arrival)
97%
Early on average
8 minutes
Age
1y, 8m
Seats
Up to 148
Flight Distance
--
Economy
Business
First
Premium Economy
In-Flight Services
None
Live TV
Wi-Fi is available
No power outlets are available
Seat Information
79 cm
More legroom than on 81% of flights
--
Seat width
105°
Reclining Angle
--
Seat layout example
In-Flight Services
Snacks
Live TV
Wi-Fi is available
Power outlet
Seat Information
97 cm
More legroom than on 90% of flights
53 cm
Seat width better than on 10% of flights
135°
Reclining Angle
--
Seat layout example
In-Flight Services
Snacks
Entertainment available, please bring your own device
Wi-Fi is available
Power outlet
Seat Information
97 cm
More legroom than on 33% of flights
53 cm
Seat width better than on 67% of flights
135°
Reclining Angle
--
Seat layout example
In-Flight Services
Snacks
Live TV
Wi-Fi is available
Power outlet
Seat Information
91 cm
More legroom than on 81% of flights
43 cm
Seat width
120°
Reclining Angle
--
Seat layout example
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Recent Flight History for UA521
Trip.com historical records show that the last UA521 flight departed on Sun, May 17 from ATL at approximately 15:57. This flight is expected to arrrive in BOS at 23:35.
| Date | Airport | Aircraft Model | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Departure | Arrival | |||||
| Wed, May 13 | Atlanta (ATL) | Boston (BOS) | B38M | 15:57 | 23:35 | Scheduled |
| Thu, May 14 | Atlanta (ATL) | Boston (BOS) | 737 | 15:57 | 23:35 | Scheduled |
| Fri, May 15 | Atlanta (ATL) | Boston (BOS) | B38M | 15:57 | 23:35 | Scheduled |
| Sat, May 16 | Houston (IAH) | Boston (BOS) | B38M | 18:37 | 23:35 | Scheduled |
| Sun, May 17 | Atlanta (ATL) | Boston (BOS) | B38M | 15:57 | 23:35 | Scheduled |
| Mon, May 18 | Atlanta (ATL) | Boston (BOS) | B38M | 15:57 | 23:35 | Scheduled |
| Tue, May 19 | Atlanta (ATL) | Boston (BOS) | 737 | 15:57 | 23:35 | 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 70% (Late on average 34 minutes), and the on-time arrival rate is 97% (Early on average 8 minutes).
On-Time Departures
Punctuality
70%
Late on average 34 minutes
Early
0%
On time
70%
30 mins late
10%
60 mins late
10%
90 mins late
10%
Cancelled
0%
On-Time Arrivals
Punctuality
97%
Early on average 8 minutes
Early
70%
On time
27%
30 mins late
0%
60 mins late
3%
90 mins late
0%
Cancelled
0%
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Arrival Info: Boston Weather & Current Time
Mostly clear
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15°C - 30°C
Weather forecast for your arrival day
0 hour time difference
Time on arrival: Atlanta 23:35| Boston 23:35
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