Washington (IAD) to Buffalo (BUF): On-Time Performance
Data through May 2026
Washington (IAD) to Buffalo (BUF) is a thinner route than most in this dataset — 125 departures over the past year, roughly 2 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 83% arrived on time.
- On-time
- 83%
- arrived <15 min late
- Avg delay
- 19 min
- completed flights
- Cancelled
- 2.4%
- Flights/day
- 0.34
- last 12 months
- Duration
- 1h 23m
- scheduled
- Distance
- 283 mi
Monthly on-time trend
Best time to fly from IAD to BUF
Aim for departures around 8 a.m. (93% on-time); avoid 10 p.m. departures (82%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 13 min |
| Tuesday | 82% | 32 min |
| Wednesday | 81% | 15 min |
| Thursday | 85% | 21 min |
| Friday | 85% | 15 min |
| Saturdaybest | 88% | 34 min |
| Sunday | 83% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft27%
- Airline operations25%
- National airspace system11%
- Weather37%
Frequently asked questions
- How often are flights from IAD to BUF delayed?
- 17% of IAD–BUF flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 19 minutes.
- What is the best time of day to fly from IAD to BUF?
- Departures around 8 a.m. have the best record (93% on-time), while departures around 10 p.m. have the worst (82%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to BUF?
- The scheduled IAD–BUF flight time averages 1h 23m over 283 miles. Actual arrival times vary — flights on this route land 15+ minutes late 17% of the time.
- How often are IAD to BUF flights cancelled?
- 2.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, slightly above the national rate of 1.6%.
- What day of the week is most reliable for IAD to BUF?
- Saturday flights have the best record at 88% on-time. Day-of-week differences on this route are meaningful — Monday trails at 77%.
Explore related pages
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Based on 252 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.