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Route Reliability

San Diego → St. Louis

SAN–STL · 1,557 miles · San Diego International Airport to St. Louis Lambert International Airport

85
Pretty Reliable
WanderNerd Reliability Score
79%
Arrive within 15 minutes
4 min
Average arrival delay
0.2%
Cancelled
475
Flights in the data

Data through May 2026.

Southwest Airlines is the only airline in this data on this route, arriving on time 79% of the time across 475 flights. No comparison to make.

What the data says

Morning flights do better here.

SAN–STL flights departing between 6–9 AM arrived on time 93% of the time, versus 65% between 12–3 PM.

Friday is doing you no favors.

SAN–STL flights arrived on time 86% of the time on Wednesdays and just 71% on Fridays. That gap is worth planning around.

It basically never cancels.

Out of 475 scheduled flights, only 0.2% were cancelled.

Flights on this route

The breakdown

On-time by weekday
  • Mon76%(62 flights)
  • Tue85%(59 flights)
  • Wed86%(57 flights)
  • Thu79%(61 flights)
  • Fri71%(68 flights)
  • Sat85%(79 flights)
  • Sun76%(86 flights)
On-time by departure window
  • 6–9 AM93%(136 flights)
  • 9 AM–12 PM81%(155 flights)
  • 12–3 PM65%(120 flights)
  • 3–6 PM—(8 flights)
  • 6–9 PM68%(53 flights)
On-time trend by month
72%
May

Jun 85% → May 72% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202585%39
July 202569%39
August 202583%35
September 202585%34
October 202597%57
November 202573%48
December 202567%46
January 202665%34
February 202694%35
March 202678%36
April 202679%33
May 202672%36

Keep nerding

Based on 475 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.