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Route Reliability

Baltimore → St. Louis

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

86
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
3 min
Average arrival delay
1.2%
Cancelled
1,283
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 83% of the time across 1,283 flights. No comparison to make.

What the data says

Morning flights do better here.

BWI–STL flights departing between 6–9 AM arrived on time 94% of the time, versus 70% between 6–9 PM.

Saturday is the weak spot.

BWI–STL flights arrived on time 87% of the time on Tuesdays. On Saturdays: 78%.

Flights on this route

The breakdown

On-time by weekday
  • Mon85%(188 flights)
  • Tue87%(170 flights)
  • Wed86%(166 flights)
  • Thu83%(186 flights)
  • Fri86%(189 flights)
  • Sat78%(166 flights)
  • Sun79%(201 flights)
On-time by departure window
  • 6–9 AM94%(356 flights)
  • 9 AM–12 PM93%(197 flights)
  • 12–3 PM83%(138 flights)
  • 3–6 PM84%(128 flights)
  • 6–9 PM70%(255 flights)
  • 9 PM–12 AM71%(192 flights)
On-time trend by month
81%
May

Jun 79% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%122
July 202573%123
August 202586%127
September 202592%117
October 202582%106
November 202589%106
December 202577%99
January 202686%69
February 202692%73
March 202679%107
April 202690%106
May 202681%111

Same trip, other airports

Keep nerding

Based on 1,283 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.