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Route Reliability

St. Louis → Atlanta

STL–ATL · 484 miles · St. Louis Lambert International Airport to Hartsfield–Jackson Atlanta International Airport

86
Pretty Reliable
WanderNerd Reliability Score
86%
Arrive within 15 minutes
0 min
Average arrival delay
1.7%
Cancelled
3,719
Flights in the data

Data through May 2026.

Who flies it best

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

  1. 1.Delta Air Lines89%2,381 flights
  2. 2.Southwest Airlines82%1,154 flights
  3. 3.Frontier Airlines63%184 flights

What the data says

Morning-you made the right choice.

STL–ATL flights departing between 6–9 AM arrived on time 94% of the time, versus 72% between 6–9 PM.

Sunday scaries are real for this one.

STL–ATL flights arrived on time 93% of the time on Wednesdays. On Sundays: 80%.

Delta Air Lines has a clear lead on this route.

Delta Air Lines arrived on time 89% of the time on this route; Frontier Airlines managed 63%.

Slipping a little lately.

STL–ATL flights arrived on time 82% of the time over the last three months in the data, compared with 86% 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
  • Mon81%(557 flights)
  • Tue87%(503 flights)
  • Wed93%(508 flights)
  • Thu90%(564 flights)
  • Fri85%(549 flights)
  • Sat83%(405 flights)
  • Sun80%(557 flights)
On-time by departure window
  • 3–6 AM—(3 flights)
  • 6–9 AM94%(962 flights)
  • 9 AM–12 PM91%(825 flights)
  • 12–3 PM83%(507 flights)
  • 3–6 PM80%(863 flights)
  • 6–9 PM72%(479 flights)
  • 9 PM–12 AM—(4 flights)
On-time trend by month
82%
May

Jun 81% → May 82% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202581%324
July 202582%348
August 202587%325
September 202596%317
October 202591%346
November 202585%273
December 202581%306
January 202688%260
February 202689%252
March 202679%274
April 202687%293
May 202682%325

Keep nerding

Based on 3,719 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.