Historical on-time performance
Washington to Chicago
577 miData through Dec 2025Source: US DOT · BTS
No flights recorded for last 12 months on this route.
By airline
How each carrier compares
No airline figures for this window yet.
Why flights run late
Delay causes
Delay-cause data appears once delayed flights are recorded for this window.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly IAD → MDW
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 5 min · 320 flights
- Middays84% on time · p90 25 min · 174 flights · limited
- Afternoons78% on time · p90 25 min · 78 flights · limited
- Evenings78% on time · p90 30 min · 241 flights
- Overnights62% on time · p90 45 min · 93 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 90% on time.
- Mondays90% on time · p90 15 min · 149 flights · limited
- Tuesdays86% on time · p90 20 min · 145 flights · limited
- Fridays85% on time · p90 25 min · 150 flights · limited
- Sundays84% on time · p90 25 min · 112 flights · limited
- Saturdays82% on time · p90 25 min · 56 flights · limited
- Thursdays79% on time · p90 30 min · 149 flights · limited
- Wednesdays78% on time · p90 30 min · 145 flights · limited
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