Historical on-time performance
Washington to Pittsburgh
183 miData through May 2026Source: US DOT · BTS
Flights on IAD–PIT arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights
based on 1,215 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesbestOn-time85%Medianon timep9020 minCancel0.7%Flights406
- Republic AirwaysOn-time80%Medianon timep9040 minCancel2.1%Flights809
Why flights run late
Delay causes
- Airline29%
- Weather9%
- Air traffic (NAS)15%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline5%
- Weather60%
- Air traffic (NAS)35%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 20 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → PIT
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 93% on time.
- Mornings93% on time · p90 5 min · 419 flights
- Middays88% on time · p90 20 min · 650 flights
- Overnights81% on time · p90 30 min · 794 flights
- Evenings81% on time · p90 35 min · 760 flights
- Afternoons75% on time · p90 50 min · 108 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 87% on time.
- Tuesdays87% on time · p90 20 min · 404 flights
- Wednesdays86% on time · p90 25 min · 417 flights
- Thursdays86% on time · p90 20 min · 422 flights
- Fridays85% on time · p90 30 min · 408 flights
- Mondays84% on time · p90 25 min · 412 flights
- Saturdays84% on time · p90 20 min · 288 flights
- Sundays78% on time · p90 50 min · 380 flights
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