BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
STL→BWI

St. Louis, MO (STL) to Baltimore, MD (BWI) flight delay odds

79.5% of 1,281 official scheduled STL-to-BWI flights arrived on time; 11.3% arrived at least 30 minutes late and 1.2% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
79.5%arrived on time
11.3%30+ min late
1.2%cancelled
1,281scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.0%all scheduled flights
120+ minutes late2.5%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+4.6 mincompleted flights

Which departure time was most reliable for STL to BWI?

Among qualifying STL-to-BWI departure window results, Early morning had the highest on-time rate: 95.6% of 408 flights. Evening was lowest at 63.2% across 386 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning40895.6%1.7%0.2%
Late morning19990.5%5.5%0.0%
Afternoon27972.0%13.3%2.5%
Evening38663.2%22.5%2.1%

Which weekday was most reliable for STL to BWI?

Among qualifying STL-to-BWI weekday results, Wednesday had the highest on-time rate: 84.5% of 168 flights. Sunday was lowest at 72.6% across 201 flights.

DayFlightsOn time30+ minCancelled
Monday19177.5%11.0%2.1%
Tuesday17582.9%9.1%0.0%
Wednesday16884.5%10.7%1.2%
Thursday18978.8%10.1%0.5%
Friday19180.6%9.9%0.5%
Saturday16681.3%10.8%0.6%
Sunday20172.6%16.9%3.5%

Which airline was most reliable for STL to BWI?

Only Southwest Airlines met the STL-to-BWI airline threshold: 79.5% of 1,281 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,28179.5%11.3%1.2%

Which month was most reliable for STL to BWI?

Among qualifying STL-to-BWI month results, April 2026 had the highest on-time rate: 86.9% of 107 flights. March 2026 was lowest at 69.2% across 107 flights.

MonthFlightsOn time30+ minCancelled
July 202512770.9%20.5%2.4%
August 202512984.5%6.2%1.6%
September 202511679.3%12.1%0.0%
October 202510985.3%5.5%0.0%
November 202510782.2%11.2%0.0%
December 202510180.2%7.9%1.0%
January 20267479.7%6.8%5.4%
February 20267482.4%8.1%2.7%
March 202610769.2%15.0%1.9%
April 202610786.9%9.3%0.0%
May 202611286.6%9.8%0.0%
June 202611869.5%19.5%1.7%

What drove STL to BWI delay minutes?

Late aircraft was the largest recorded STL-to-BWI delay category, accounting for 61.2% of 14,817 BTS-attributed delay minutes during July 2025–June 2026.

Airline24.5%
Late aircraft61.2%
National airspace10.8%
Weather3.5%
Security0.0%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.