IAD to PIT flight delays & on-time performance
Nonstop flights from Washington Dulles International Airport to Pittsburgh International Airport · 182 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAD or PIT right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Washington (IAD) to Pittsburgh (PIT) arrived on time 85% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.5% were cancelled, and 5% arrived an hour or more late.
- United Airlines was the most punctual airline here (87% on time); Republic Airways was the least (83%).
- Departures scheduled around 8am did best (92% on time); around 5pm did worst (79%).
- Tuesday was the most reliable day to fly (88% on time) and Sunday the least (82%).
- The largest source of delay minutes was late-arriving aircraft (42%).
Which airline is most on time from IAD to PIT?
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 | 87% | 0.8% | 11 min | 4.7% | 516 |
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 83% | 2.1% | 12 min | 5.8% | 711 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 8am92%251 flights
- 12pm90%257 flights
- 1pm100%26 flights
- 5pm79%329 flights
- 10pm80%364 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday84%2.1% cancelled
- Tuesday88%1.1% cancelled
- Wednesday87%1.1% cancelled
- Thursday85%1.1% cancelled
- Friday84%0.0% cancelled
- Saturday82%1.7% cancelled
- Sunday82%3.9% 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 aircraft42%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion20%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather63%
- Air traffic control & airport congestion26%
- Airline (crew, maintenance, cleaning, fueling)11%
- Security0%
IAD to PIT: common questions
- How often are IAD to PIT flights on time?
- 85% 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 Washington to Pittsburgh cancelled?
- 1.5% of scheduled flights were cancelled (19 of 1,227).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 72 min behind schedule on average, and 5.3% of flights were an hour or more late.
- How long is taxi time at IAD?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PIT to IAD — 89% on time
More flights from Washington
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAD → PIT, nonstop flights by US airlines that report to the DOT. How we calculate this.