St. Louis (STL) to Baltimore (BWI): On-Time Performance
Data through May 2026
When you fly STL to BWI matters as much as anything else about the booking: the route swung from 90% on-time in October 2024 to just 65% in July 2024. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (92% vs 67%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 1.1%
- Flights/day
- 3.5
- last 12 months
- Duration
- 1h 60m
- scheduled
- Distance
- 738 mi
Monthly on-time trend
Best time to fly from STL to BWI
Aim for departures around 7 a.m. (97% on-time); avoid 9 p.m. departures (55%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 80% | 11 min |
| Tuesday | 85% | 9 min |
| Wednesdaybest | 86% | 10 min |
| Thursday | 80% | 12 min |
| Friday | 80% | 14 min |
| Saturday | 81% | 11 min |
| Sunday | 78% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft55%
- Airline operations24%
- National airspace system17%
- Weather5%
Frequently asked questions
- How often are flights from STL to BWI delayed?
- 19% of STL–BWI flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from STL to BWI?
- Departures around 7 a.m. have the best record (97% on-time), while departures around 9 p.m. have the worst (55%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from STL to BWI?
- The scheduled STL–BWI flight time averages 1h 60m over 738 miles. Actual arrival times vary — flights on this route land 15+ minutes late 19% of the time.
- How often are STL to BWI flights cancelled?
- 1.1% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from STL to BWI?
- July 2024 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 90%. If your dates are flexible, that 25-point gap is worth planning around.
Explore related pages
More routes from STL
Based on 2,622 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.