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Flight Reliability

UA 5603 · United Airlines

Chicago → FNT (ORD–FNT)95% of its flights flew this route. The rest (ORD–BWI, SCE–ORD) are included in these numbers.

54
A Little Dicey
WanderNerd Reliability Score
67%
Arrive within 15 minutes
30 min
Average arrival delay
2.9%
Cancelled
1 min early
Median arrival delay

Based on 346 historical flights. Data through May 2026.

What the data says

Saturdays have been rough.

UA 5603 arrived on time 77% of the time on Tuesdays and just 61% on Saturdays. That gap is worth planning around.

Lagging the United Airlines network.

UA 5603 arrived on time 67% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon69%(48 flights)
  • Tue77%(47 flights)
  • Wed65%(48 flights)
  • Thu71%(49 flights)
  • Fri63%(46 flights)
  • Sat61%(49 flights)
  • Sun63%(49 flights)
On-time by departure window
  • 6–9 AM—(1 flights)
  • 3–6 PM67%(18 flights)
  • 6–9 PM67%(317 flights)
On-time trend by month
69%
May

Jun 70% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202570%30
July 202566%29
August 202567%30
September 202577%30
October 202581%31
November 202563%27
December 202562%29
January 202668%31
February 202659%27
March 202655%29
April 202667%27
May 202669%16
Departures on time
68%
Diverted
0%
Flights flown
336
Months covered
12

Same route, other flights

Keep nerding

Based on 346 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.