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Route Reliability

Boston → St. Louis

BOS–STL · 1,047 miles · Boston Logan International Airport to St. Louis Lambert International Airport

78
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
6 min
Average arrival delay
1.4%
Cancelled
1,613
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.American Airlines82%676 flights
  2. 2.Southwest Airlines73%937 flights

What the data says

Morning flights do better here.

BOS–STL flights departing between 3–6 AM arrived on time 95% of the time, versus 44% between 6–9 PM.

Sunday scaries are real for this one.

BOS–STL flights arrived on time 85% of the time on Saturdays. On Sundays: 70%.

American Airlines runs this route best.

American Airlines arrived on time 82% of the time on this route; Southwest Airlines managed 73%.

Slipping a little lately.

BOS–STL flights arrived on time 78% of the time over the last three months in the data, compared with 82% in the three months before that.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon76%(235 flights)
  • Tue81%(227 flights)
  • Wed81%(229 flights)
  • Thu70%(234 flights)
  • Fri79%(240 flights)
  • Sat85%(179 flights)
  • Sun70%(240 flights)
On-time by departure window
  • 3–6 AM95%(101 flights)
  • 6–9 AM93%(545 flights)
  • 9 AM–12 PM86%(184 flights)
  • 12–3 PM72%(205 flights)
  • 3–6 PM65%(327 flights)
  • 6–9 PM44%(222 flights)
On-time trend by month
77%
May

Jun 71% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%144
July 202574%145
August 202582%145
September 202572%140
October 202566%148
November 202587%141
December 202573%145
January 202688%96
February 202687%91
March 202671%116
April 202685%132
May 202677%141

Keep nerding

Based on 1,613 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.