Historical on-time performance
St. Louis to Baltimore
737 miData through Dec 2025Source: US DOT · BTS
Flights on STL–BWI arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled1.4%of scheduled flights
based on 1,318 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time80%Medianon timep9040 minCancel1.4%Flights1,318
Why flights run late
Delay causes
- Airline22%
- Weather7%
- Air traffic (NAS)16%
- Late aircraft56%
- Security0%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly STL → BWI
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 92% on time.
- Mornings92% on time · p90 10 min · 1,547 flights
- Middays86% on time · p90 20 min · 509 flights
- Afternoons75% on time · p90 30 min · 558 flights
- Evenings70% on time · p90 45 min · 777 flights
- Overnights63% on time · p90 65 min · 480 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 84% on time.
- Tuesdays84% on time · p90 20 min · 531 flights
- Wednesdays83% on time · p90 25 min · 532 flights
- Fridays80% on time · p90 25 min · 570 flights
- Thursdays80% on time · p90 30 min · 563 flights
- Saturdays80% on time · p90 35 min · 497 flights
- Sundays79% on time · p90 35 min · 610 flights
- Mondays79% on time · p90 25 min · 568 flights
Advertisement
Keep exploring