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Flight Reliability

AA 3745 · American Airlines

Chicago → COU (ORD–COU)92% of its flights flew this route. The rest (RST–ORD) are included in these numbers.

62
A Little Dicey
WanderNerd Reliability Score
68%
Arrive within 15 minutes
15 min
Average arrival delay
2.7%
Cancelled
4 min early
Median arrival delay

Based on 330 historical flights. Data through May 2026.

What the data says

The 12–3 PM departure wins.

AA 3745 departing between 12–3 PM arrived on time 75% of the time, versus 62% between 3–6 PM.

Thursdays have been rough.

AA 3745 arrived on time 80% of the time on Saturdays and just 60% on Thursdays. That gap is worth planning around.

Lagging the American Airlines network.

AA 3745 arrived on time 68% of the time, versus 77% across the American Airlines network.

Trending in the right direction.

AA 3745 arrived on time 75% of the time over the last three months in the data, compared with 57% in the three months before that.

The breakdown

On-time by weekday
  • Mon69%(51 flights)
  • Tue76%(42 flights)
  • Wed63%(40 flights)
  • Thu60%(48 flights)
  • Fri63%(43 flights)
  • Sat80%(45 flights)
  • Sun65%(52 flights)
On-time by departure window
  • 12–3 PM75%(28 flights)
  • 3–6 PM62%(77 flights)
  • 6–9 PM69%(216 flights)
On-time trend by month
84%
May

Jun 67% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202567%30
July 202563%30
August 202577%31
September 202569%13
October 202568%28
November 202568%22
December 202548%23
January 202663%30
February 202661%28
March 202666%29
April 202677%26
May 202684%31
Departures on time
71%
Diverted
0%
Flights flown
321
Months covered
12

Same route, other flights

Keep nerding

Based on 330 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.