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Route Reliability

St. Louis → Baltimore

STL–BWI · 738 miles · St. Louis Lambert International Airport to Baltimore/Washington International Thurgood Marshall Airport

84
Pretty Reliable
WanderNerd Reliability Score
82%
Arrive within 15 minutes
5 min
Average arrival delay
1.2%
Cancelled
1,288
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 82% of the time across 1,288 flights. No comparison to make.

What the data says

Morning flights do better here.

STL–BWI flights departing between 6–9 AM arrived on time 96% of the time, versus 29% between 9 PM–12 AM.

Sunday scaries are real for this one.

STL–BWI flights arrived on time 87% of the time on Wednesdays. On Sundays: 75%.

Flights on this route

The breakdown

On-time by weekday
  • Mon83%(187 flights)
  • Tue85%(172 flights)
  • Wed87%(167 flights)
  • Thu81%(187 flights)
  • Fri81%(188 flights)
  • Sat82%(165 flights)
  • Sun75%(204 flights)
On-time by departure window
  • 3–6 AM96%(209 flights)
  • 6–9 AM96%(216 flights)
  • 9 AM–12 PM92%(189 flights)
  • 12–3 PM79%(167 flights)
  • 3–6 PM68%(188 flights)
  • 6–9 PM67%(287 flights)
  • 9 PM–12 AM29%(14 flights)
On-time trend by month
88%
May

Jun 75% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202575%123
July 202573%124
August 202587%127
September 202579%116
October 202586%109
November 202583%107
December 202582%100
January 202686%70
February 202686%71
March 202671%104
April 202688%107
May 202688%112

Same trip, other airports

Keep nerding

Based on 1,288 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.