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Flight Reliability

UA 397 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 397 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

87%
Arrive within 15 minutes
1 min early
Average arrival delay
0%
Cancelled
10 min early
Median arrival delay

Based on 452 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon92%(65 flights)
  • Tue89%(66 flights)
  • Wed89%(62 flights)
  • Thu88%(65 flights)
  • Fri82%(65 flights)
  • Sat92%(65 flights)
  • Sun80%(64 flights)
On-time by departure window
  • 3–6 AM100%(36 flights)
  • 6–9 AM87%(112 flights)
  • 9 AM–12 PM86%(301 flights)
  • 12–3 PM—(3 flights)
On-time trend by month
94%
May

Jun 82% → May 94% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202582%34
July 202575%61
August 202593%28
September 202587%30
October 202594%31
November 202590%30
December 202577%31
January 202695%57
February 202694%54
March 202686%35
April 202683%30
May 202694%31
Departures on time
86%
Diverted
0%
Flights flown
452
Months covered
12

Keep nerding

Based on 452 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.