BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
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BOS→STL

Southwest Airlines Boston, MA (BOS) to St. Louis, MO (STL) reliability

Among 935 scheduled Southwest Airlines flights from BOS to STL, 71.4% arrived on time, 17.3% arrived at least 30 minutes late, and 1.0% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Marketing carrier: Southwest Airlines (WN) · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
71.4%arrived on time
17.3%30+ min late
1.0%cancelled
935scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
30+ minutes late17.3%
60+ minutes late8.8%
Cancelled1.0%
Average arrival+11.8 mincompleted flights

What did Southwest Airlines BOS to STL record?

Southwest Airlines completed 98.7% of its scheduled reportable BOS to STL flights in the observation window. 71.4% of all scheduled flights arrived less than 15 minutes late, while 8.8% arrived at least an hour late.

What were Southwest Airlines BOS to STL disruption rates?

For Southwest Airlines BOS-to-STL flights, 17.3% arrived at least 30 minutes late, 1.0% were cancelled, and 0.3% were diverted.

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What was the Southwest Airlines BOS to STL scheduled cohort?

The Southwest Airlines BOS-to-STL cohort contained 935 scheduled flights; 923 completed, 9 were cancelled, and 3 were diverted.

Not a prediction.

This is a descriptive historical rate. Schedule changes, seasonal operations and current conditions may differ.