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Flight Reliability

UA 5237 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 5237 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

59%
Arrive within 15 minutes
25 min
Average arrival delay
2.0%
Cancelled
3 min
Median arrival delay

Based on 256 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon56%(39 flights)
  • Tue49%(33 flights)
  • Wed58%(31 flights)
  • Thu69%(39 flights)
  • Fri51%(35 flights)
  • Sat69%(32 flights)
  • Sun63%(40 flights)
On-time by departure window
  • 6–9 AM95%(21 flights)
  • 9 AM–12 PM—(3 flights)
  • 12–3 PM79%(19 flights)
  • 3–6 PM49%(172 flights)
  • 6–9 PM74%(34 flights)
On-time trend by month
62%
May

Jun 48% → May 62% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202548%29
July 202521%29
August 202528%29
September 202567%30
October 202562%29
December 202571%14
February 202690%19
March 202690%19
April 202680%30
May 202662%13
Departures on time
68%
Diverted
0.8%
Flights flown
249
Months covered
11

Keep nerding

Based on 256 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.