Skip to content
WanderNerd
Check a flight

Route Reliability

Seattle → Washington

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

76
Usually Fine
WanderNerd Reliability Score
81%
Arrive within 15 minutes
1 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.Delta Air Lines92%365 flights
  2. 2.Alaska Airlines76%729 flights

What the data says

Morning flights do better here.

SEA–DCA flights departing between 6–9 AM arrived on time 88% of the time, versus 67% between 12–3 PM.

Thursdays have been rough.

SEA–DCA flights arrived on time 90% of the time on Saturdays and just 75% on Thursdays. That gap is worth planning around.

Delta Air Lines has a clear lead on this route.

Delta Air Lines arrived on time 92% of the time on this route; Alaska Airlines managed 76%.

Ticking up lately.

SEA–DCA flights arrived on time 90% of the time over the last three months in the data, compared with 83% 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%(151 flights)
  • Tue84%(152 flights)
  • Wed84%(153 flights)
  • Thu75%(150 flights)
  • Fri80%(151 flights)
  • Sat90%(152 flights)
  • Sun79%(150 flights)
On-time by departure window
  • 6–9 AM88%(706 flights)
  • 12–3 PM67%(353 flights)
On-time trend by month
91%
May

Jun 70% → May 91% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%86
July 202569%84
August 202578%90
September 202567%89
October 202587%93
November 202580%85
December 202587%90
January 202682%88
February 202681%83
March 202686%88
April 202691%90
May 202691%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.