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Flight Reliability

UA 4478 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4478 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

75%
Arrive within 15 minutes
20 min
Average arrival delay
2.1%
Cancelled
9 min early
Median arrival delay

Based on 291 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(42 flights)
  • Tue62%(37 flights)
  • Wed77%(39 flights)
  • Thu76%(37 flights)
  • Fri72%(47 flights)
  • Sat81%(42 flights)
  • Sun80%(39 flights)
On-time by departure window
  • 6–9 AM81%(53 flights)
  • 9 AM–12 PM90%(100 flights)
  • 12–3 PM55%(101 flights)
  • 3–6 PM69%(13 flights)
  • 6–9 PM77%(13 flights)
  • 9 PM–12 AM—(3 flights)
On-time trend by month
84%
May

Jun 73% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%30
July 202559%29
August 202559%29
October 202581%16
November 202573%26
December 202547%15
January 202686%29
February 202681%26
March 202667%15
April 202693%30
May 202684%31
Departures on time
77%
Diverted
0.7%
Flights flown
283
Months covered
12

Keep nerding

Based on 291 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.