Historical on-time performance
Washington to Detroit
383 miData through Dec 2025Source: US DOT · BTS
Flights on IAD–DTW arrive on time 77% of the time over the last 12 months.
On-time rate77%arrived within 15 min
p90 delay70 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 908 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Republic AirwaysOn-time73%Median5 minp9045 minCancel0.0%Flights30
- SkyWest AirlinesOn-time78%Medianon timep9070 minCancel0.6%Flights878
Why flights run late
Delay causes
- Airline71%
- Weather14%
- Air traffic (NAS)13%
- Late aircraft1%
- Security2%
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 IAD → DTW
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 — 88% on time.
- Mornings88% on time · p90 20 min · 1,472 flights
- Middays82% on time · p90 40 min · 1,026 flights
- Overnights75% on time · p90 40 min · 93 flights · limited
- Evenings74% on time · p90 70 min · 1,073 flights
- Afternoons68% on time · p90 150 min · 84 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 78% to 84% on time.
- Wednesdays84% on time · p90 30 min · 558 flights
- Thursdays83% on time · p90 30 min · 540 flights
- Mondays82% on time · p90 65 min · 542 flights
- Fridays82% on time · p90 30 min · 547 flights
- Tuesdays81% on time · p90 40 min · 548 flights
- Saturdays79% on time · p90 55 min · 477 flights
- Sundays78% on time · p90 65 min · 536 flights
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