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Flight Reliability

UA 4388 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4388 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

61%
Arrive within 15 minutes
34 min
Average arrival delay
3.5%
Cancelled
2 min
Median arrival delay

Based on 343 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon57%(46 flights)
  • Tue67%(48 flights)
  • Wed57%(49 flights)
  • Thu63%(48 flights)
  • Fri54%(50 flights)
  • Sat66%(44 flights)
  • Sun67%(46 flights)
On-time by departure window
  • 6–9 AM46%(13 flights)
  • 9 AM–12 PM64%(11 flights)
  • 12–3 PM68%(38 flights)
  • 3–6 PM66%(227 flights)
  • 6–9 PM33%(42 flights)
On-time trend by month
56%
May

Jun 64% → May 56% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202564%14
July 202539%31
August 202548%29
September 202573%30
October 202594%31
November 202567%27
December 202546%28
January 202667%30
February 202678%27
March 202650%28
April 202655%29
May 202656%27
Departures on time
66%
Diverted
0%
Flights flown
331
Months covered
12

Keep nerding

Based on 343 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.