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Route Reliability

St. Louis → San Diego

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

84
Pretty Reliable
WanderNerd Reliability Score
77%
Arrive within 15 minutes
7 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 77% of the time across 475 flights. No comparison to make.

What the data says

Morning flights do better here.

STL–SAN flights departing between 6–9 AM arrived on time 93% of the time, versus 48% between 6–9 PM.

Wednesday is the weak spot.

STL–SAN flights arrived on time 83% of the time on Tuesdays. On Wednesdays: 70%.

It basically never cancels.

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

Trending in the right direction.

STL–SAN flights arrived on time 91% of the time over the last three months in the data, compared with 77% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon74%(62 flights)
  • Tue83%(59 flights)
  • Wed70%(56 flights)
  • Thu76%(62 flights)
  • Fri82%(68 flights)
  • Sat82%(79 flights)
  • Sun72%(87 flights)
On-time by departure window
  • 3–6 AM—(1 flights)
  • 6–9 AM93%(105 flights)
  • 9 AM–12 PM86%(143 flights)
  • 12–3 PM70%(60 flights)
  • 3–6 PM70%(103 flights)
  • 6–9 PM48%(60 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
89%
May

Jun 67% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%39
July 202559%39
August 202569%36
September 202582%33
October 202575%57
November 202579%48
December 202567%46
January 202686%35
February 202677%35
March 202689%35
April 202694%34
May 202689%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.