Historical on-time performance
Boston to St. Louis
1,046 miData through May 2026Source: US DOT · BTS
Flights on BOS–STL arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay50 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 1,280 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Envoy AirbestOn-time79%Medianon timep9060 minCancel0.7%Flights282
- Republic AirwaysOn-time75%Medianon timep9040 minCancel3.3%Flights61
- Southwest AirlinesOn-time71%Medianon timep9050 minCancel1.1%Flights937
Why flights run late
Delay causes
- Airline23%
- Weather4%
- Air traffic (NAS)10%
- Late aircraft63%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline7%
- Weather64%
- Air traffic (NAS)29%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 14 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 BOS → STL
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 — 91% on time.
- Mornings91% on time · p90 10 min · 2,093 flights
- Middays83% on time · p90 25 min · 1,031 flights
- Afternoons65% on time · p90 70 min · 694 flights
- Evenings54% on time · p90 80 min · 885 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 83% on time.
- Saturdays83% on time · p90 20 min · 487 flights
- Tuesdays82% on time · p90 30 min · 694 flights
- Wednesdays81% on time · p90 35 min · 693 flights
- Fridays78% on time · p90 40 min · 714 flights
- Thursdays77% on time · p90 40 min · 709 flights
- Mondays77% on time · p90 45 min · 711 flights
- Sundays73% on time · p90 50 min · 719 flights
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