Historical on-time performance
St. Louis to Baltimore
737 miData through May 2026Source: 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 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 1,288 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 minCancel1.2%Flights1,288
Why flights run late
Delay causes
- Airline23%
- Weather5%
- Air traffic (NAS)12%
- Late aircraft60%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather87%
- Air traffic (NAS)13%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 15 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
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 · 1,557 flights
- Middays85% on time · p90 20 min · 508 flights
- Afternoons73% on time · p90 35 min · 596 flights
- Evenings70% on time · p90 55 min · 763 flights
- Overnights62% on time · p90 70 min · 463 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 85% on time.
- Tuesdays85% on time · p90 20 min · 521 flights
- Wednesdays84% on time · p90 25 min · 520 flights
- Thursdays80% on time · p90 35 min · 576 flights
- Saturdays80% on time · p90 35 min · 496 flights
- Fridays79% on time · p90 35 min · 583 flights
- Sundays78% on time · p90 40 min · 616 flights
- Mondays77% on time · p90 30 min · 575 flights
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