Historical on-time performance
Dallas to Seattle
1,670 miData through May 2026Source: US DOT · BTS
Flights on DAL–SEA arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 188 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time69%Medianon timep9060 minCancel1.1%Flights188
Why flights run late
Delay causes
- Airline32%
- Weather2%
- Air traffic (NAS)20%
- Late aircraft46%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather100%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 2 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 67% to 82% on time.
- Mornings82% on time · p90 25 min · 197 flights · limited
- Afternoons81% on time · p90 20 min · 506 flights
- Evenings67% on time · p90 50 min · 239 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 82% on time.
- Mondays82% on time · p90 20 min · 143 flights · limited
- Wednesdays81% on time · p90 25 min · 143 flights · limited
- Tuesdays81% on time · p90 25 min · 121 flights · limited
- Thursdays77% on time · p90 25 min · 141 flights · limited
- Fridays73% on time · p90 30 min · 144 flights · limited
- Saturdays73% on time · p90 40 min · 164 flights · limited
- Sundays70% on time · p90 40 min · 161 flights · limited
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