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Flight Reliability

AA 4321 · American Airlines

Chicago → ALO (ORD–ALO)

49
Bring Snacks
WanderNerd Reliability Score
69%
Arrive within 15 minutes
19 min
Average arrival delay
4.0%
Cancelled
2 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

AA 4321 departing between 6–9 PM arrived on time 83% of the time, versus 67% between 9 PM–12 AM.

Wednesdays have been rough.

AA 4321 arrived on time 81% of the time on Saturdays and just 57% on Wednesdays. That gap is worth planning around.

A bit behind the ORD–ALO route.

AA 4321 arrived on time 69% of the time, versus 73% across the ORD–ALO route.

Lagging the American Airlines network.

AA 4321 arrived on time 69% of the time, versus 77% across the American Airlines network.

The breakdown

On-time by weekday
  • Mon63%(51 flights)
  • Tue75%(48 flights)
  • Wed57%(47 flights)
  • Thu62%(47 flights)
  • Fri74%(46 flights)
  • Sat81%(47 flights)
  • Sun70%(47 flights)
On-time by departure window
  • 3–6 PM—(5 flights)
  • 6–9 PM83%(41 flights)
  • 9 PM–12 AM67%(287 flights)
On-time trend by month
80%
May

Jun 67% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%24
July 202557%28
August 202581%31
September 202570%27
October 202580%30
November 202576%25
December 202556%25
January 202653%30
February 202689%28
March 202668%28
April 202644%27
May 202680%30
Departures on time
68%
Diverted
1.7%
Flights flown
333
Months covered
12

Same route, other flights

Keep nerding

Based on 353 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.