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Flight Reliability

UA 4178 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4178 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

79%
Arrive within 15 minutes
10 min
Average arrival delay
1.5%
Cancelled
7 min early
Median arrival delay

Based on 269 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon69%(35 flights)
  • Tue73%(40 flights)
  • Wed89%(44 flights)
  • Thu73%(30 flights)
  • Fri84%(38 flights)
  • Sat83%(46 flights)
  • Sun81%(32 flights)
On-time by departure window
  • 3–6 AM89%(18 flights)
  • 6–9 AM90%(78 flights)
  • 9 AM–12 PM77%(43 flights)
  • 12–3 PM75%(92 flights)
  • 3–6 PM—(1 flights)
  • 6–9 PM64%(33 flights)
On-time trend by month
69%
May

Jun 90% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%20
August 202591%11
September 202596%23
October 202568%31
November 202583%30
December 202541%17
February 202695%21
March 202673%48
April 2026100%25
May 202669%26
Departures on time
82%
Diverted
0%
Flights flown
265
Months covered
12

Keep nerding

Based on 269 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.