| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| May 30 | IAD | BUF | 17:49 | 18:41 |
Landed
|
Track > |
| May 23 | IAD | BUF | 18:38 | 19:30 |
Landed Late
|
Track > |
United Airlines Flight UA4521 connects Washington, United States to Buffalo, United States, taking off from Washington Dulles International Airport IAD and landing at Buffalo Niagara International Airport BUF.
How long is the UA4521 flight from Washington to Buffalo?
The average flight time from Washington to Buffalo is 52 minutes. The flight distance is 457 km / 284 miles and the average flight speed is 527 km/h / 327 mph.
How many UA4521 flights are operated per week?
1 flight per week. The flight UA4521 is operated on Saturday.
What is the On-Time Performance (OTP) of United Airlines Flight UA4521 Washington to Buffalo?
The Airportia On-Time Performance Rating for United Airlines Flight UA4521 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest UA4521 flight?
The latest flight took off on Saturday, May 30th, 2026 with the flight status being Landed on 18:41.
How else can the flight UA4521 be referenced as?
This United Airlines flight can also be referenced as UAL4521, UA 4521, UAL 4521.
How often is flight UA4521 delayed?
On average, 50% of all UA4521 flights are delayed. The average delay is 28 minutes.
Can I get compensation for my delayed or cancelled UA4521 flight or baggage issues?
If your UA4521 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 UA4521 Flight Tracker above for more details.
Flight UA4521 is code-shared by 4 airlines using the flight numbers AV2042, CM2142, LH7566, SN8933
Other flights departing from Washington IAD: F92959, UA3624, UA4926, UA4871
Other flights arriving at Buffalo BUF: F91692, OO3969, B61202, AA6114
All flights connecting Washington IAD to Buffalo BUF.