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Flight Reliability

UA 4166 · United Airlines

ABE → Chicago (ABE–ORD)83% of its flights flew this route. The rest (BGR–EWR, ORD–MSN) are included in these numbers.

76
Usually Fine
WanderNerd Reliability Score
87%
Arrive within 15 minutes
3 min
Average arrival delay
3.0%
Cancelled
11 min early
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

The 6–9 AM departure wins.

UA 4166 departing between 6–9 AM arrived on time 88% of the time, versus 74% between 9 AM–12 PM.

Thursdays have been rough.

UA 4166 arrived on time 94% of the time on Fridays and just 77% on Thursdays. That gap is worth planning around.

Better than the ABE–ORD route average.

UA 4166 arrived on time 87% of the time, versus 72% across the ABE–ORD route.

Better than the United Airlines network average.

UA 4166 arrived on time 87% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon90%(49 flights)
  • Tue94%(47 flights)
  • Wed88%(50 flights)
  • Thu77%(51 flights)
  • Fri94%(49 flights)
  • Sat84%(49 flights)
  • Sun84%(51 flights)
On-time by departure window
  • 6–9 AM88%(323 flights)
  • 9 AM–12 PM74%(23 flights)
On-time trend by month
77%
May

Jun 90% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202597%31
August 2025100%28
September 2025100%29
October 202597%31
November 202570%30
December 202590%29
January 202677%26
February 202688%24
March 202686%29
April 202671%28
May 202677%31
Departures on time
88%
Diverted
1.7%
Flights flown
346
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.