Historical on-time performance
Chicago to Washington
589 miData through Dec 2025Source: US DOT · BTS
Flights on ORD–IAD arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,989 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- United AirlinesOn-time73%Medianon timep9050 minCancel0.6%Flights1,989
Why flights run late
Delay causes
- Airline35%
- Weather6%
- Air traffic (NAS)23%
- Late aircraft35%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly ORD → IAD
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 — 84% on time.
- Mornings84% on time · p90 25 min · 1,323 flights
- Middays80% on time · p90 30 min · 1,425 flights
- Overnights74% on time · p90 50 min · 933 flights
- Afternoons72% on time · p90 65 min · 516 flights
- Evenings65% on time · p90 75 min · 1,136 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 78% on time.
- Tuesdays78% on time · p90 40 min · 758 flights
- Wednesdays78% on time · p90 50 min · 765 flights
- Mondays77% on time · p90 40 min · 761 flights
- Saturdays76% on time · p90 45 min · 746 flights
- Thursdays75% on time · p90 45 min · 761 flights
- Fridays75% on time · p90 45 min · 758 flights
- Sundays73% on time · p90 55 min · 784 flights
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