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Route Reliability

Raleigh–Durham → Seattle

RDU–SEA · 2,354 miles · Raleigh–Durham International Airport to Seattle–Tacoma International Airport

77
Usually Fine
WanderNerd Reliability Score
78%
Arrive within 15 minutes
3 min
Average arrival delay
1.5%
Cancelled
919
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.Delta Air Lines86%364 flights
  2. 2.Alaska Airlines72%555 flights

What the data says

Morning-you made the right choice.

RDU–SEA flights departing between 6–9 AM arrived on time 81% of the time, versus 71% between 6–9 PM.

Mondays have been rough.

RDU–SEA flights arrived on time 83% of the time on Saturdays and just 68% on Mondays. That gap is worth planning around.

Delta Air Lines runs this route best.

Delta Air Lines arrived on time 86% of the time on this route; Alaska Airlines managed 72%.

Trending in the right direction.

RDU–SEA flights arrived on time 77% of the time over the last three months in the data, compared with 69% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon68%(134 flights)
  • Tue80%(125 flights)
  • Wed76%(120 flights)
  • Thu78%(129 flights)
  • Fri79%(135 flights)
  • Sat83%(124 flights)
  • Sun80%(132 flights)
On-time by departure window
  • 6–9 AM81%(575 flights)
  • 3–6 PM75%(32 flights)
  • 6–9 PM71%(292 flights)
On-time trend by month
76%
May

Jun 80% → May 76% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%90
July 202572%93
August 202579%85
September 202593%75
October 202583%64
November 202586%65
December 202551%71
January 202676%63
February 202679%53
March 202668%68
April 202689%81
May 202676%91

Keep nerding

Based on 919 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.