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Flight Reliability

UA 4670 · United Airlines

DLH → Chicago (DLH–ORD)88% of its flights flew this route. The rest (ATW–ORD, ORD–SDF) are included in these numbers.

68
Usually Fine
WanderNerd Reliability Score
77%
Arrive within 15 minutes
20 min
Average arrival delay
2.7%
Cancelled
3 min early
Median arrival delay

Based on 375 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4670 departing between 9 AM–12 PM arrived on time 90% of the time, versus 48% between 12–3 PM.

Monday is the weak spot.

UA 4670 arrived on time 81% of the time on Tuesdays. On Mondays: 68%.

Better than the DLH–ORD route average.

UA 4670 arrived on time 77% of the time, versus 70% across the DLH–ORD route.

The breakdown

On-time by weekday
  • Mon68%(53 flights)
  • Tue81%(53 flights)
  • Wed79%(52 flights)
  • Thu81%(53 flights)
  • Fri77%(52 flights)
  • Sat80%(50 flights)
  • Sun75%(51 flights)
On-time by departure window
  • 6–9 AM80%(323 flights)
  • 9 AM–12 PM90%(10 flights)
  • 12–3 PM48%(31 flights)
On-time trend by month
83%
May

Jun 93% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202583%30
August 202581%31
September 202590%29
October 202587%31
November 202582%28
December 202562%29
January 202658%31
February 202686%28
March 202670%27
April 202648%29
May 202683%41
Departures on time
80%
Diverted
0.3%
Flights flown
364
Months covered
12

Same route, other flights

Keep nerding

Based on 375 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.