| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Dec 01 | BUF | IAD | 14:15 | 11:55 |
Unknown
|
Track > |
| Nov 27 | BUF | IAD | 12:09 | 12:56 |
Delayed
|
Track > |
| Nov 25 | BUF | IAD | 11:08 | 11:58 |
Landed
|
Track > |
| Nov 21 | BUF | IAD | 10:47 | 11:35 |
Landed
|
Track > |
| Nov 20 | BUF | IAD | 11:53 | 12:44 |
Delayed
|
Track > |
| Nov 18 | BUF | IAD | 11:07 | 11:51 |
Landed
|
Track > |
| Nov 17 | BUF | IAD | 10:39 | 11:40 |
Landed
|
Track > |
| Nov 14 | BUF | IAD | 10:51 | 11:40 |
Landed
|
Track > |
| Nov 13 | BUF | IAD | 10:34 | 11:21 |
Landed
|
Track > |
| Nov 11 | BUF | IAD | 13:47 | 11:55 |
Unknown
|
Track > |
United Airlines Flight UA4020 connects Buffalo, United States to Washington, United States, taking off from Buffalo Niagara International Airport BUF and landing at Washington Dulles International Airport IAD.
How long is the UA4020 flight from Buffalo to Washington?
The average flight time from Buffalo to Washington is 49 minutes. The flight distance is 457 km / 284 miles and the average flight speed is 516 km/h / 320 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA4020 Buffalo to Washington?
The Airportia On-Time Performance Rating for United Airlines Flight UA4020 is 4.8/5 stars. This metric is calculated using data from the past 10 flights.
When was the latest UA4020 flight?
The latest flight took off on Monday, December 1st, 2025 with the flight status being Unknown on 11:55.
How else can the flight UA4020 be referenced as?
This United Airlines flight can also be referenced as UAL4020, UA 4020, UAL 4020.
How often is flight UA4020 delayed?
On average, 30% of all UA4020 flights are delayed. The average delay is 37 minutes.
Can I get compensation for my delayed or cancelled UA4020 flight or baggage issues?
If your UA4020 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 UA4020 Flight Tracker above for more details.
Flight UA4020 is code-shared by 2 airlines using the flight numbers AV2043, CM2149
Other flights departing from Buffalo BUF: UA4737, UA3431, UA5322, AA3382
Other flights arriving at Washington IAD: UA4424, UA6230, UA1617, UA1733
All flights connecting Buffalo BUF to Washington IAD.