Historical on-time performance
Seattle to Raleigh-durham
2,354 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–RDU arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 778 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time80%Medianon timep9025 minCancel0.3%Flights307
- Alaska AirlinesOn-time74%Medianon timep9030 minCancel0.6%Flights471
Why flights run late
Delay causes
- Airline39%
- Weather0%
- Air traffic (NAS)29%
- Late aircraft32%
- 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 → RDU
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 83% on time.
- Afternoons83% on time · p90 25 min · 849 flights
- Mornings80% on time · p90 25 min · 938 flights
- Middays75% on time · p90 25 min · 155 flights · limited
- Overnights73% on time · p90 30 min · 674 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 85% on time.
- Tuesdays85% on time · p90 20 min · 365 flights
- Wednesdays84% on time · p90 25 min · 369 flights
- Saturdays80% on time · p90 25 min · 362 flights
- Thursdays78% on time · p90 30 min · 375 flights
- Fridays77% on time · p90 30 min · 383 flights
- Sundays76% on time · p90 30 min · 382 flights
- Mondays75% on time · p90 30 min · 380 flights
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