BWI to BUF flight delays & on-time performance
Nonstop flights from Baltimore/Washington International Thurgood Marshall Airport to Buffalo Niagara International Airport · 281 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BWI or BUF right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Baltimore (BWI) to Buffalo (BUF) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.9% were cancelled, and 6% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 11am did best (91% on time); around 10pm did worst (58%).
- Wednesday was the most reliable day to fly (83% on time) and Sunday the least (73%).
- The largest source of delay minutes was late-arriving aircraft (45%).
Which airline is most on time from BWI to BUF?
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 |
|---|---|---|---|---|---|
| Southwest Airlines | 77% | 1.9% | 13 min | 5.6% | 1,748 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am89%319 flights
- 7am97%37 flights
- 10am88%288 flights
- 11am91%76 flights
- 1pm73%135 flights
- 2pm84%68 flights
- 3pm75%123 flights
- 4pm70%67 flights
- 5pm66%79 flights
- 6pm66%122 flights
- 7pm65%55 flights
- 8pm78%93 flights
- 9pm61%99 flights
- 10pm58%168 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday77%3.9% cancelled
- Tuesday81%2.4% cancelled
- Wednesday83%0.4% cancelled
- Thursday74%0.4% cancelled
- Friday79%1.9% cancelled
- Saturday75%1.3% cancelled
- Sunday73%2.8% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft45%
- Airline (crew, maintenance, cleaning, fueling)37%
- Air traffic control & airport congestion15%
- Extreme weather2%
- Security1%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather70%
- Airline (crew, maintenance, cleaning, fueling)24%
- Air traffic control & airport congestion6%
- Security0%
BWI to BUF: common questions
- How often are BWI to BUF flights on time?
- 77% 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 Baltimore to Buffalo cancelled?
- 1.9% of scheduled flights were cancelled (33 of 1,748).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 52 min behind schedule on average, and 5.6% of flights were an hour or more late.
- How long is taxi time at BWI?
- Flights on this route spent 15 min taxiing from the gate to takeoff on average.
Related routes
Return trip: BUF to BWI — 87% on time
More flights from Baltimore
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BWI → BUF, nonstop flights by US airlines that report to the DOT. How we calculate this.