Historical on-time performance
Dallas to Seattle
1,670 miData through Dec 2025Source: US DOT · BTS
Flights on DAL–SEA arrive on time 63% of the time over the last 12 months.
On-time rate63%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled1.6%of scheduled flights
based on 127 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time63%Median5 minp9065 minCancel1.6%Flights127
Why flights run late
Delay causes
- Airline34%
- Weather2%
- Air traffic (NAS)17%
- Late aircraft46%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly DAL → 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 62% to 86% on time.
- Mornings86% on time · p90 25 min · 109 flights · limited
- Afternoons81% on time · p90 20 min · 520 flights
- Evenings72% on time · p90 45 min · 367 flights
- Middays62% on time · p90 50 min · 66 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 84% on time.
- Tuesdays84% on time · p90 20 min · 131 flights · limited
- Mondays84% on time · p90 15 min · 153 flights · limited
- Wednesdays78% on time · p90 30 min · 153 flights · limited
- Thursdays77% on time · p90 25 min · 149 flights · limited
- Fridays76% on time · p90 30 min · 152 flights · limited
- Saturdays74% on time · p90 35 min · 163 flights · limited
- Sundays69% on time · p90 40 min · 170 flights · limited
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