Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 4438 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4438 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

82%
Arrive within 15 minutes
8 min
Average arrival delay
1.9%
Cancelled
11 min early
Median arrival delay

Based on 371 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon80%(50 flights)
  • Tue87%(52 flights)
  • Wed83%(52 flights)
  • Thu87%(53 flights)
  • Fri87%(52 flights)
  • Sat74%(50 flights)
  • Sun79%(53 flights)
On-time by departure window
  • 6–9 AM86%(309 flights)
  • 9 AM–12 PM78%(32 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM30%(20 flights)
On-time trend by month
50%
May

Jun 83% → May 50% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202583%30
July 202587%31
August 2025100%31
September 202597%29
October 202584%37
November 202593%29
December 202577%30
January 202672%29
February 202689%28
March 202661%28
April 202693%30
May 202650%30
Departures on time
85%
Diverted
0.5%
Flights flown
362
Months covered
12

Keep nerding

Based on 371 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.