Historical on-time performance
Seattle to Washington
2,329 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–DCA arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.4%of scheduled flights
based on 1,004 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time87%Medianon timep9015 minCancel1.8%Flights275
- Alaska AirlinesOn-time68%Medianon timep9055 minCancel1.2%Flights729
Why flights run late
Delay causes
- Airline34%
- Weather2%
- Air traffic (NAS)54%
- Late aircraft9%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → DCA
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 67% to 80% on time.
- Mornings80% on time · p90 30 min · 1,394 flights
- Afternoons76% on time · p90 35 min · 549 flights
- Middays67% on time · p90 50 min · 544 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 85% on time.
- Saturdays85% on time · p90 20 min · 354 flights
- Tuesdays80% on time · p90 30 min · 357 flights
- Wednesdays78% on time · p90 30 min · 357 flights
- Fridays75% on time · p90 40 min · 354 flights
- Sundays74% on time · p90 40 min · 357 flights
- Thursdays72% on time · p90 50 min · 351 flights
- Mondays71% on time · p90 40 min · 357 flights
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