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Flight Reliability

UA 4613 · United Airlines

Chicago → St. Louis (ORD–STL)93% of its flights flew this route. The rest (DAY–ORD, ATW–ORD) are included in these numbers.

73
Usually Fine
WanderNerd Reliability Score
75%
Arrive within 15 minutes
14 min
Average arrival delay
1.5%
Cancelled
8 min early
Median arrival delay

Based on 388 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 4613 departing between 6–9 AM arrived on time 86% of the time, versus 74% between 9 AM–12 PM.

Mondays have been rough.

UA 4613 arrived on time 83% of the time on Tuesdays and just 67% on Mondays. That gap is worth planning around.

A bit ahead of the ORD–STL route.

UA 4613 arrived on time 75% of the time, versus 69% across the ORD–STL route.

A bit behind the United Airlines network.

UA 4613 arrived on time 75% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon67%(54 flights)
  • Tue83%(52 flights)
  • Wed81%(52 flights)
  • Thu79%(52 flights)
  • Fri69%(58 flights)
  • Sat75%(56 flights)
  • Sun70%(57 flights)
On-time by departure window
  • 6–9 AM86%(28 flights)
  • 9 AM–12 PM74%(353 flights)
On-time trend by month
78%
May

Jun 90% → May 78% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202571%31
August 202581%31
September 202583%30
October 202584%31
November 202569%29
December 202574%27
January 202663%27
February 202663%27
March 202679%48
April 202653%30
May 202678%40
Departures on time
79%
Diverted
0.3%
Flights flown
381
Months covered
12

Same route, other flights

Keep nerding

Based on 388 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.