Historical on-time performance
Detroit to Seattle
1,927 miData through Dec 2025Source: US DOT · BTS
Flights on DTW–SEA arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.6%of scheduled flights
based on 1,980 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.
- Delta Air LinesOn-time80%Medianon timep9030 minCancel0.7%Flights1,508
- Alaska AirlinesOn-time76%Medianon timep9035 minCancel0.2%Flights472
Why flights run late
Delay causes
- Airline39%
- Weather3%
- 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 DTW → SEA
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 73% to 87% on time.
- Mornings87% on time · p90 15 min · 1,837 flights
- Middays87% on time · p90 20 min · 1,096 flights
- Afternoons82% on time · p90 25 min · 1,483 flights
- Evenings77% on time · p90 35 min · 984 flights
- Overnights73% on time · p90 45 min · 755 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 86% on time.
- Tuesdays86% on time · p90 20 min · 822 flights
- Saturdays85% on time · p90 25 min · 796 flights
- Wednesdays83% on time · p90 25 min · 847 flights
- Sundays82% on time · p90 30 min · 928 flights
- Mondays82% on time · p90 30 min · 929 flights
- Thursdays81% on time · p90 30 min · 909 flights
- Fridays79% on time · p90 35 min · 924 flights
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