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Route Reliability

St. Louis → Boston

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

72
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
13 min
Average arrival delay
1.5%
Cancelled
1,612
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.American Airlines76%676 flights
  2. 2.Southwest Airlines68%936 flights

What the data says

Morning flights do better here.

STL–BOS flights departing between 6–9 AM arrived on time 92% of the time, versus 61% between 6–9 PM.

Sunday scaries are real for this one.

STL–BOS flights arrived on time 77% of the time on Tuesdays. On Sundays: 66%.

American Airlines runs this route best.

American Airlines arrived on time 76% of the time on this route; Southwest Airlines managed 68%.

Recent months have been rougher.

STL–BOS flights arrived on time 66% 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
  • Mon68%(238 flights)
  • Tue77%(230 flights)
  • Wed73%(229 flights)
  • Thu68%(236 flights)
  • Fri75%(240 flights)
  • Sat75%(178 flights)
  • Sun66%(236 flights)
On-time by departure window
  • 6–9 AM92%(220 flights)
  • 9 AM–12 PM83%(395 flights)
  • 12–3 PM64%(355 flights)
  • 3–6 PM62%(172 flights)
  • 6–9 PM61%(437 flights)
  • 9 PM–12 AM—(8 flights)
On-time trend by month
65%
May

Jun 69% → May 65% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202569%144
July 202567%146
August 202584%145
September 202570%141
October 202556%149
November 202576%138
December 202581%145
January 202681%96
February 202684%91
March 202665%116
April 202669%134
May 202665%142

Keep nerding

Based on 1,612 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.