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Flight Reliability

UA 5537 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5537 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

85%
Arrive within 15 minutes
1 min
Average arrival delay
2.2%
Cancelled
8 min early
Median arrival delay

Based on 278 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(38 flights)
  • Tue88%(32 flights)
  • Wed84%(32 flights)
  • Thu83%(41 flights)
  • Fri93%(41 flights)
  • Sat84%(43 flights)
  • Sun77%(43 flights)
On-time by departure window
  • 3–6 AM—(4 flights)
  • 6–9 AM89%(145 flights)
  • 9 AM–12 PM93%(54 flights)
  • 12–3 PM84%(45 flights)
  • 3–6 PM—(7 flights)
  • 6–9 PM47%(15 flights)
On-time trend by month
92%
May

Jun 86% → May 92% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202586%29
July 2025100%19
August 202590%19
September 202597%30
October 202593%30
November 202578%27
December 202584%31
February 202683%18
March 202681%31
April 202653%19
May 202692%12
Departures on time
88%
Diverted
0.7%
Flights flown
270
Months covered
12

Keep nerding

Based on 278 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.