BUF to IAD flight delays & on-time performance
Nonstop flights from Buffalo Niagara International Airport to Washington Dulles International Airport · 283 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BUF or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Buffalo (BUF) to Washington (IAD) arrived on time 88% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 2% were cancelled, and 6% arrived an hour or more late.
- Departures scheduled around 8pm did best (92% on time); around 6am did worst (85%).
- Thursday was the most reliable day to fly (96% on time) and Tuesday the least (71%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (46%).
Which airline is most on time from BUF to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 100% | 0.0% | 5 min | 0.0% | 5 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 87% | 2.1% | 17 min | 6.5% | 142 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am85%49 flights
- 10am88%67 flights
- 8pm92%26 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday89%9.5% cancelled
- Tuesday71%0.0% cancelled
- Wednesday85%4.8% cancelled
- Thursday96%0.0% cancelled
- Friday86%0.0% cancelled
- Saturday89%0.0% cancelled
- Sunday90%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)46%
- Late-arriving aircraft43%
- Air traffic control & airport congestion10%
- Extreme weather2%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)33%
- Extreme weather33%
- Air traffic control & airport congestion33%
- Security0%
BUF to IAD: common questions
- How often are BUF to IAD flights on time?
- 88% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Buffalo to Washington cancelled?
- 2.0% of scheduled flights were cancelled (3 of 147).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 126 min behind schedule on average, and 6.3% of flights were an hour or more late.
- How long is taxi time at BUF?
- Flights on this route spent 16 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to BUF — 85% on time
More flights from Buffalo
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BUF → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.