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Flight Reliability

AA 4129 · American Airlines

SGF → Chicago (SGF–ORD)

86
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
3 min
Average arrival delay
1.3%
Cancelled
8 min early
Median arrival delay

Based on 317 historical flights. Data through May 2026.

What the data says

The 3–6 AM departure wins.

AA 4129 departing between 3–6 AM arrived on time 90% of the time, versus 82% between 6–9 AM.

Sunday scaries are real for this one.

AA 4129 arrived on time 95% of the time on Saturdays and just 78% on Sundays. That gap is worth planning around.

Better than the SGF–ORD route average.

AA 4129 arrived on time 84% of the time, versus 70% across the SGF–ORD route.

Better than the American Airlines network average.

AA 4129 arrived on time 84% of the time, versus 77% across the American Airlines network.

The breakdown

On-time by weekday
  • Mon78%(51 flights)
  • Tue90%(39 flights)
  • Wed88%(50 flights)
  • Thu86%(51 flights)
  • Fri82%(51 flights)
  • Sat95%(19 flights)
  • Sun78%(51 flights)
On-time by departure window
  • 3–6 AM90%(79 flights)
  • 6–9 AM82%(233 flights)
On-time trend by month
86%
May

Jun 92% → May 86% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202592%26
July 202589%27
August 202590%30
September 202596%27
October 202590%31
November 202581%26
December 202569%26
January 202675%20
February 202685%20
March 202662%21
April 202686%29
May 202686%29
Departures on time
91%
Diverted
0.3%
Flights flown
312
Months covered
12

Same route, other flights

Keep nerding

Based on 317 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.