Historical on-time performance
Raleigh-durham to Seattle
2,354 miData through May 2026Source: US DOT · BTS
Flights on RDU–SEA arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.3%of scheduled flights
based on 834 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time83%Medianon timep9020 minCancel1.0%Flights307
- Alaska AirlinesOn-time69%Medianon timep9045 minCancel1.5%Flights527
Why flights run late
Delay causes
- Airline32%
- Weather4%
- Air traffic (NAS)37%
- Late aircraft26%
- Security2%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline55%
- Weather45%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 11 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 RDU → SEA
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 83% on time.
- Mornings83% on time · p90 25 min · 1,649 flights
- Evenings72% on time · p90 35 min · 1,031 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 83% on time.
- Tuesdays83% on time · p90 25 min · 367 flights
- Saturdays83% on time · p90 25 min · 372 flights
- Wednesdays80% on time · p90 35 min · 372 flights
- Thursdays77% on time · p90 30 min · 387 flights
- Fridays77% on time · p90 30 min · 395 flights
- Sundays76% on time · p90 30 min · 396 flights
- Mondays75% on time · p90 40 min · 391 flights
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