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Flight Reliability

AA 1543 · American Airlines

Chicago → San Diego (ORD–SAN)84% of its flights flew this route. The rest (LAS–PHL, SAN–ORD) are included in these numbers.

61
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
20 min
Average arrival delay
2.2%
Cancelled
1 min
Median arrival delay

Based on 359 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AA 1543 departing between 9 PM–12 AM arrived on time 89% of the time, versus 63% between 6–9 PM.

Sunday scaries are real for this one.

AA 1543 arrived on time 73% of the time on Tuesdays. On Sundays: 59%.

A bit behind the ORD–SAN route.

AA 1543 arrived on time 68% of the time, versus 73% across the ORD–SAN route.

Lagging the American Airlines network.

AA 1543 arrived on time 68% of the time, versus 77% across the American Airlines network.

The breakdown

On-time by weekday
  • Mon72%(50 flights)
  • Tue73%(51 flights)
  • Wed65%(48 flights)
  • Thu64%(50 flights)
  • Fri71%(51 flights)
  • Sat71%(51 flights)
  • Sun59%(49 flights)
On-time by departure window
  • 3–6 PM64%(212 flights)
  • 6–9 PM63%(84 flights)
  • 9 PM–12 AM89%(54 flights)
On-time trend by month
90%
May

Jun 47% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202547%30
July 202547%30
August 202561%31
September 202576%29
October 202580%30
November 202574%27
December 202562%29
January 202667%27
February 202661%28
March 202666%29
April 202683%30
May 202690%30
Departures on time
67%
Diverted
0.3%
Flights flown
350
Months covered
12

Same route, other flights

Keep nerding

Based on 359 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.