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

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

Historically, 79.5% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,281 flights.

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

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

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%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

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%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 flights.

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

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

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 reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

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.