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Flight Reliability

UA 1421 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1421 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

90%
Arrive within 15 minutes
3 min early
Average arrival delay
0.5%
Cancelled
9 min early
Median arrival delay

Based on 436 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon91%(64 flights)
  • Tue89%(53 flights)
  • Wed91%(57 flights)
  • Thu97%(65 flights)
  • Fri84%(63 flights)
  • Sat88%(65 flights)
  • Sun89%(66 flights)
On-time by departure window
  • 6–9 AM92%(345 flights)
  • 12–3 PM80%(86 flights)
  • 9 PM–12 AM—(2 flights)
On-time trend by month
89%
May

Jun 97% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202597%30
July 2025100%30
August 2025100%30
September 202597%29
October 202587%31
November 202597%30
December 202576%45
January 202678%36
February 202696%23
March 202685%53
April 202692%59
May 202689%37
Departures on time
95%
Diverted
0.2%
Flights flown
433
Months covered
12

Keep nerding

Based on 436 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.