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Flight Reliability

UA 4603 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 4603 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

67%
Arrive within 15 minutes
30 min
Average arrival delay
1.9%
Cancelled
3 min early
Median arrival delay

Based on 309 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon70%(47 flights)
  • Tue74%(43 flights)
  • Wed64%(39 flights)
  • Thu60%(50 flights)
  • Fri71%(45 flights)
  • Sat75%(36 flights)
  • Sun56%(43 flights)
On-time by departure window
  • 6–9 AM77%(30 flights)
  • 9 AM–12 PM85%(71 flights)
  • 12–3 PM85%(68 flights)
  • 3–6 PM43%(125 flights)
  • 9 PM–12 AM—(9 flights)
On-time trend by month
68%
May

Jun 55% → May 68% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202555%29
July 202536%31
August 202592%13
November 202579%29
December 202544%25
January 202644%18
February 202629%14
March 202690%49
April 202693%44
May 202668%40
Departures on time
74%
Diverted
0%
Flights flown
303
Months covered
12

Keep nerding

Based on 309 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.