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Flight Reliability

UA 5103 · United Airlines

Chicago → JLN (ORD–JLN)81% of its flights flew this route. The rest (JLN–DEN, IAH–CHA) are included in these numbers.

52
A Little Dicey
WanderNerd Reliability Score
71%
Arrive within 15 minutes
32 min
Average arrival delay
3.0%
Cancelled
3 min early
Median arrival delay

Based on 361 historical flights. Data through May 2026.

What the data says

The 3–6 PM departure wins.

UA 5103 departing between 3–6 PM arrived on time 76% of the time, versus 68% between 9 AM–12 PM.

Sunday scaries are real for this one.

UA 5103 arrived on time 77% of the time on Tuesdays. On Sundays: 63%.

Lagging the United Airlines network.

UA 5103 arrived on time 71% of the time, versus 79% across the United Airlines network.

Keep a backup plan handy.

UA 5103 was cancelled 3.0% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon64%(50 flights)
  • Tue77%(51 flights)
  • Wed72%(50 flights)
  • Thu75%(48 flights)
  • Fri76%(49 flights)
  • Sat70%(50 flights)
  • Sun63%(48 flights)
On-time by departure window
  • 9 AM–12 PM68%(28 flights)
  • 12–3 PM71%(31 flights)
  • 3–6 PM76%(46 flights)
  • 6–9 PM76%(37 flights)
  • 9 PM–12 AM69%(204 flights)
On-time trend by month
70%
May

Jun 64% → May 70% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%28
July 202559%29
August 202573%30
September 202583%29
October 202580%30
November 202565%26
December 202559%27
January 202674%31
February 202682%28
March 202664%28
April 202673%30
May 202670%30
Departures on time
70%
Diverted
1.1%
Flights flown
346
Months covered
12

Same route, other flights

Keep nerding

Based on 361 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.