United Airlines UA521

Landed
BOS
Flag for United States   Boston
IAD
Flag for United States   Washington
1h 4m
748km / 461mi
(Direct: 664km, +11%)
22. May 2025
DEPARTURE
09:38 EDT
13:38 UTC
09:30
+8 minutes
TERMINAL: B GATE: B26
ARRIVAL
10:43 EDT
14:43 UTC
11:10
-27 minutes
TERMINAL: D14 GATE: D14
Altitude
ft
Speed
kts
Track
°
FREQUENCY
irregular/new
DISTANCE
664km
FLIGHTS/WEEK
36
PUNCTUALITY
85%
CLAIM COMPENSATION
Flight delays happen, but that doesn't mean you have to accept them. You may be entitled to as much as €600/$700 in compensation if your flight has been delayed, canceled or overbooked within the last three years.
How long is flight UA521?
The flight has a distance of 664 km (410 mi.) with an average flight time of 1 hours and 40 minutes.
How often does UA521 fly?
Flight UA521 is operated infrequently or with changing schedules.
How many flights operate between Boston and Washington?
The route from Boston to Washington is served by 4 airline(s) with 36 flights per week. Its weekly capacity is 25,806.
Which airlines fly on this route?
This route is flown by: Lufthansa , Delta Air Lines , United Airlines , Flexjet
If UA521 was delayed or cancelled, can I get compensation?
Flight delays happen, but that doesn't mean you have to accept them. You may be entitled to as much as €600/$700 in compensation if your flight has been delayed, canceled or overbooked within the last three years.
Check Compensation
PAST FLIGHTS
13:30 EDT
in 15 hours
1min late
15:10 EDT
in 16 hours
13:30 EDT
8 hours ago
18min late
15:10 EDT
7 hours ago
14min early
13:30 EDT
1 days ago
7min late
15:10 EDT
1 days ago
21min early
13:30 EDT
2 days ago
10min late
15:10 EDT
2 days ago
16min early
13:30 EDT
3 days ago
2min late
15:10 EDT
3 days ago
19min early

CODESHARES

This flight is operated by United Airlines as flight number UA521. Tickets are also sold as:

HISTORICAL FLIGHTS

2025
2024
2023
2022
2021
2020
2019
2018
2017

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