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Route Reliability

St. Louis → Washington

STL–DCA · 719 miles · St. Louis Lambert International Airport to Ronald Reagan Washington National Airport

66
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
14 min
Average arrival delay
2.6%
Cancelled
2,410
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.American Airlines74%1,011 flights
  2. 2.Southwest Airlines73%1,399 flights

What the data says

Morning flights do better here.

STL–DCA flights departing between 6–9 AM arrived on time 88% of the time, versus 59% between 6–9 PM.

Sunday scaries are real for this one.

STL–DCA flights arrived on time 83% of the time on Saturdays. On Sundays: 68%.

Not much between American Airlines and Southwest Airlines.

On this route they all land within 73% to 74% on time. Pick on schedule and price.

Flights on this route

The breakdown

On-time by weekday
  • Mon69%(355 flights)
  • Tue79%(369 flights)
  • Wed76%(369 flights)
  • Thu69%(363 flights)
  • Fri73%(354 flights)
  • Sat83%(205 flights)
  • Sun68%(313 flights)
On-time by departure window
  • 3–6 AM69%(13 flights)
  • 6–9 AM88%(678 flights)
  • 9 AM–12 PM78%(259 flights)
  • 12–3 PM73%(426 flights)
  • 3–6 PM65%(542 flights)
  • 6–9 PM59%(410 flights)
On-time trend by month
73%
May

Jun 64% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%186
July 202560%183
August 202573%194
September 202577%216
October 202579%222
November 202575%201
December 202575%199
January 202676%181
February 202674%171
March 202669%189
April 202683%192
May 202673%194

Same trip, other airports

Keep nerding

Based on 2,410 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.