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Flight Reliability

UA 3603 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 3603 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

85%
Arrive within 15 minutes
0 min
Average arrival delay
2.3%
Cancelled
12 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon87%(47 flights)
  • Tue83%(48 flights)
  • Wed85%(48 flights)
  • Thu88%(49 flights)
  • Fri83%(52 flights)
  • Sat80%(49 flights)
  • Sun87%(52 flights)
On-time by departure window
  • 6–9 AM81%(59 flights)
  • 9 AM–12 PM—(8 flights)
  • 12–3 PM90%(202 flights)
  • 3–6 PM72%(58 flights)
  • 6–9 PM78%(18 flights)
On-time trend by month
83%
May

Jun 90% → May 83% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%29
July 202587%31
August 202597%29
September 202597%30
October 202581%31
November 202589%26
December 202569%29
January 202681%31
February 202693%28
March 202687%15
April 202663%24
May 202683%42
Departures on time
89%
Diverted
0%
Flights flown
345
Months covered
12

Keep nerding

Based on 353 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.