Skip to content
WanderNerd
Check a flight

Route Reliability

Washington → St. Louis

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

70
Usually Fine
WanderNerd Reliability Score
74%
Arrive within 15 minutes
13 min
Average arrival delay
2.4%
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.Southwest Airlines77%1,399 flights
  2. 2.American Airlines70%1,011 flights

What the data says

Morning flights do better here.

DCA–STL flights departing between 6–9 AM arrived on time 86% of the time, versus 61% between 6–9 PM.

Friday is doing you no favors.

DCA–STL flights arrived on time 81% of the time on Saturdays. On Fridays: 67%.

Southwest Airlines has a slight edge here.

Southwest Airlines arrived on time 77% of the time on this route; American Airlines managed 70%.

Flights on this route

The breakdown

On-time by weekday
  • Mon77%(360 flights)
  • Tue79%(374 flights)
  • Wed75%(364 flights)
  • Thu76%(364 flights)
  • Fri67%(365 flights)
  • Sat81%(211 flights)
  • Sun68%(309 flights)
On-time by departure window
  • 6–9 AM86%(603 flights)
  • 9 AM–12 PM82%(65 flights)
  • 12–3 PM77%(792 flights)
  • 3–6 PM68%(243 flights)
  • 6–9 PM61%(634 flights)
  • 9 PM–12 AM70%(10 flights)
On-time trend by month
73%
May

Jun 65% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202565%186
July 202562%188
August 202580%196
September 202581%214
October 202576%223
November 202575%205
December 202569%200
January 202681%186
February 202677%173
March 202674%194
April 202678%190
May 202673%192

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.