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Route Reliability

Washington → Seattle

DCA–SEA · 2,329 miles · Ronald Reagan Washington National Airport to Seattle–Tacoma International Airport

74
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
10 min
Average arrival delay
1.6%
Cancelled
1,094
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Alaska Airlines77%729 flights
  2. 2.Delta Air Lines67%365 flights

What the data says

Morning flights do better here.

DCA–SEA flights departing between 6–9 AM arrived on time 81% of the time, versus 70% between 3–6 PM.

Thursday is the weak spot.

DCA–SEA flights arrived on time 84% of the time on Saturdays. On Thursdays: 69%.

Alaska Airlines runs this route best.

Alaska Airlines arrived on time 77% of the time on this route; Delta Air Lines managed 67%.

Trending in the right direction.

DCA–SEA flights arrived on time 76% of the time over the last three months in the data, compared with 65% 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
  • Mon76%(152 flights)
  • Tue74%(155 flights)
  • Wed69%(155 flights)
  • Thu69%(151 flights)
  • Fri74%(154 flights)
  • Sat84%(154 flights)
  • Sun72%(152 flights)
On-time by departure window
  • 6–9 AM81%(360 flights)
  • 3–6 PM70%(713 flights)
On-time trend by month
84%
May

Jun 78% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%90
July 202559%88
August 202586%91
September 202583%90
October 202581%93
November 202574%89
December 202548%91
January 202680%88
February 202668%83
March 202658%87
April 202687%90
May 202684%93

Same trip, other airports

Keep nerding

Based on 1,094 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.