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Flight Reliability

UA 4188 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4188 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

76%
Arrive within 15 minutes
15 min
Average arrival delay
1.7%
Cancelled
9 min early
Median arrival delay

Based on 300 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon79%(43 flights)
  • Tue73%(40 flights)
  • Wed80%(40 flights)
  • Thu81%(43 flights)
  • Fri68%(44 flights)
  • Sat84%(38 flights)
  • Sun71%(44 flights)
On-time by departure window
  • 6–9 AM86%(59 flights)
  • 9 AM–12 PM83%(144 flights)
  • 12–3 PM54%(13 flights)
  • 6–9 PM62%(47 flights)
  • 9 PM–12 AM55%(29 flights)
On-time trend by month
87%
May

Jun 55% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202555%29
July 2025100%16
August 202569%29
September 202580%30
October 202568%31
November 202590%29
December 202567%27
January 202689%28
February 202691%11
April 202666%29
May 202687%30
Departures on time
81%
Diverted
1.0%
Flights flown
292
Months covered
12

Keep nerding

Based on 300 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.