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Flight Reliability

AA 4637 · American Airlines

Philadelphia → Indianapolis (PHL–IND)

52
A Little Dicey
WanderNerd Reliability Score
72%
Arrive within 15 minutes
11 min
Average arrival delay
6.6%
Cancelled
7 min early
Median arrival delay

Based on 316 historical flights. Data through May 2026.

What the data says

Sunday scaries are real for this one.

AA 4637 arrived on time 81% of the time on Tuesdays and just 60% on Sundays. That gap is worth planning around.

A bit behind the PHL–IND route.

AA 4637 arrived on time 72% of the time, versus 77% across the PHL–IND route.

A bit behind the American Airlines network.

AA 4637 arrived on time 72% of the time, versus 77% across the American Airlines network.

Keep a backup plan handy.

AA 4637 was cancelled 6.6% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon73%(41 flights)
  • Tue81%(41 flights)
  • Wed73%(41 flights)
  • Thu69%(42 flights)
  • Fri75%(44 flights)
  • Sat77%(43 flights)
  • Sun60%(42 flights)
On-time by departure window
  • 12–3 PM—(2 flights)
  • 6–9 PM73%(292 flights)
On-time trend by month
73%
May

Jun 57% → May 73% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202557%21
July 202550%24
August 202561%28
September 202597%29
October 202574%31
November 202583%29
December 202557%30
January 202679%28
February 202677%26
March 202681%31
May 202673%11
Departures on time
74%
Diverted
0.3%
Flights flown
294
Months covered
12

Same route, other flights

Keep nerding

Based on 316 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.