Historical on-time performance
Washington to Pittsburgh
183 miData through Dec 2025Source: 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 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights
based on 1,117 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Republic AirwaysOn-time80%Medianon timep9040 minCancel1.9%Flights931
- United AirlinesbestOn-time88%Medianon timep9015 minCancel0.0%Flights186
Why flights run late
Delay causes
- Airline26%
- Weather10%
- Air traffic (NAS)17%
- Late aircraft48%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 95% on time.
- Mornings95% on time · p90 on time · 385 flights
- Middays88% on time · p90 20 min · 583 flights
- Evenings83% on time · p90 30 min · 756 flights
- Overnights83% on time · p90 30 min · 789 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 80% to 88% on time.
- Tuesdays88% on time · p90 15 min · 389 flights
- Wednesdays88% on time · p90 15 min · 404 flights
- Thursdays87% on time · p90 25 min · 402 flights
- Mondays85% on time · p90 20 min · 393 flights
- Saturdays85% on time · p90 20 min · 288 flights
- Fridays85% on time · p90 25 min · 390 flights
- Sundays80% on time · p90 50 min · 355 flights
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