Historical on-time performance
Seattle to Detroit
1,927 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–DTW arrive on time 83% of the time over the last 12 months.
On-time rate83%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 1,979 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time85%Medianon timep9020 minCancel0.7%Flights1,507
- Alaska AirlinesOn-time78%Medianon timep9025 minCancel0.0%Flights472
Why flights run late
Delay causes
- Airline49%
- Weather0%
- Air traffic (NAS)18%
- Late aircraft33%
- 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 SEA → DTW
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 79% to 88% on time.
- Mornings88% on time · p90 15 min · 2,139 flights
- Afternoons87% on time · p90 15 min · 735 flights
- Middays80% on time · p90 25 min · 1,657 flights
- Overnights79% on time · p90 25 min · 1,599 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 81% to 87% on time.
- Tuesdays87% on time · p90 15 min · 829 flights
- Wednesdays86% on time · p90 20 min · 848 flights
- Saturdays85% on time · p90 20 min · 800 flights
- Thursdays83% on time · p90 25 min · 904 flights
- Mondays83% on time · p90 25 min · 924 flights
- Fridays82% on time · p90 25 min · 926 flights
- Sundays81% on time · p90 30 min · 919 flights
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