Historical on-time performance
Baltimore to St. Louis
737 miData through Dec 2025Source: US DOT · BTS
Flights on BWI–STL arrive on time 80% of the time over the last 12 months.
On-time rate80%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights
based on 1,312 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 timep9035 minCancel1.5%Flights1,312
Why flights run late
Delay causes
- Airline30%
- Weather3%
- Air traffic (NAS)14%
- Late aircraft52%
- 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 BWI → STL
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 — 90% on time.
- Mornings90% on time · p90 10 min · 1,171 flights
- Middays85% on time · p90 20 min · 728 flights
- Afternoons74% on time · p90 40 min · 506 flights
- Evenings65% on time · p90 70 min · 617 flights
- Overnights64% on time · p90 60 min · 847 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 81% on time.
- Tuesdays81% on time · p90 35 min · 539 flights
- Wednesdays81% on time · p90 25 min · 537 flights
- Thursdays79% on time · p90 35 min · 563 flights
- Fridays77% on time · p90 40 min · 569 flights
- Mondays76% on time · p90 35 min · 568 flights
- Sundays74% on time · p90 40 min · 603 flights
- Saturdays72% on time · p90 45 min · 490 flights
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