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Flight Reliability

UA 1999 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1999 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

92%
Arrive within 15 minutes
8 min early
Average arrival delay
1.7%
Cancelled
15 min early
Median arrival delay

Based on 416 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon95%(56 flights)
  • Tue93%(57 flights)
  • Wed97%(59 flights)
  • Thu95%(59 flights)
  • Fri85%(60 flights)
  • Sat91%(57 flights)
  • Sun90%(60 flights)
On-time by departure window
  • 6–9 AM93%(282 flights)
  • 9 AM–12 PM92%(51 flights)
  • 12–3 PM91%(75 flights)
On-time trend by month
88%
May

Jun 93% → May 88% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%29
July 202590%31
August 202590%30
September 2025100%30
October 202597%31
November 202597%30
December 202590%31
January 202690%29
February 202686%42
March 202696%54
April 202690%29
May 202688%42
Departures on time
91%
Diverted
0.2%
Flights flown
408
Months covered
12

Keep nerding

Based on 416 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.