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Flight Reliability

UA 5538 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5538 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

65%
Arrive within 15 minutes
29 min
Average arrival delay
3.2%
Cancelled
6 min
Median arrival delay

Based on 317 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon61%(46 flights)
  • Tue64%(45 flights)
  • Wed74%(42 flights)
  • Thu68%(44 flights)
  • Fri60%(45 flights)
  • Sat58%(40 flights)
  • Sun67%(45 flights)
On-time by departure window
  • 6–9 AM91%(55 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM56%(135 flights)
  • 6–9 PM60%(108 flights)
  • 9 PM–12 AM—(6 flights)
On-time trend by month
69%
May

Jun 79% → May 69% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202579%29
July 202590%31
August 202566%29
September 202564%22
November 202564%25
December 202558%31
January 202650%28
February 202646%26
March 202654%28
April 202660%25
May 202669%26
Departures on time
79%
Diverted
0%
Flights flown
307
Months covered
12

Keep nerding

Based on 317 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.