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

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

81.7% of 1,270 official scheduled BWI-to-STL flights arrived on time; 10.0% 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 SIGNALLower disruption
81.7%arrived on time
10.0%30+ min late
1.2%cancelled
1,270scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.9%all scheduled flights
120+ minutes late2.6%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+3.1 mincompleted flights

Which departure time was most reliable for BWI to STL?

Among qualifying BWI-to-STL departure window results, Early morning had the highest on-time rate: 91.9% of 358 flights. Night was lowest at 69.4% across 193 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning35891.9%3.1%0.8%
Late morning20290.1%5.9%0.5%
Afternoon22782.4%7.5%0.9%
Evening29070.7%17.6%1.0%
Night19369.4%18.7%3.1%

Which weekday was most reliable for BWI to STL?

Among qualifying BWI-to-STL weekday results, Tuesday had the highest on-time rate: 87.0% of 169 flights. Sunday was lowest at 75.0% across 200 flights.

DayFlightsOn time30+ minCancelled
Monday19082.1%8.9%1.1%
Tuesday16987.0%7.1%0.0%
Wednesday16581.8%8.5%1.2%
Thursday18982.0%9.5%0.5%
Friday19184.8%7.3%1.0%
Saturday16679.5%15.7%0.0%
Sunday20075.0%13.0%4.0%

Which airline was most reliable for BWI to STL?

Only Southwest Airlines met the BWI-to-STL airline threshold: 81.7% of 1,270 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Southwest Airlines1,27081.7%10.0%1.2%

Which month was most reliable for BWI to STL?

Among qualifying BWI-to-STL month results, September 2025 had the highest on-time rate: 90.6% of 117 flights. July 2025 was lowest at 70.9% across 127 flights.

MonthFlightsOn time30+ minCancelled
July 202512770.9%20.5%3.1%
August 202512983.7%9.3%1.6%
September 202511790.6%6.0%0.0%
October 202510682.1%9.4%0.0%
November 202510786.9%7.5%0.9%
December 202510174.3%11.9%2.0%
January 20267380.8%11.0%5.5%
February 20267490.5%4.1%1.4%
March 202610778.5%11.2%0.0%
April 202610787.9%4.7%0.0%
May 202611181.1%9.0%0.0%
June 202611175.7%12.6%0.9%

What drove BWI to STL delay minutes?

Late aircraft was the largest recorded BWI-to-STL delay category, accounting for 52.3% of 13,636 BTS-attributed delay minutes during July 2025–June 2026.

Airline31.1%
Late aircraft52.3%
National airspace12.3%
Weather3.7%
Security0.5%
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.