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Flight Reliability

UA 1856 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1856 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

73%
Arrive within 15 minutes
17 min
Average arrival delay
1.4%
Cancelled
3 min early
Median arrival delay

Based on 436 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon74%(61 flights)
  • Tue77%(62 flights)
  • Wed76%(62 flights)
  • Thu63%(62 flights)
  • Fri70%(63 flights)
  • Sat80%(59 flights)
  • Sun68%(60 flights)
On-time by departure window
  • 6–9 AM85%(111 flights)
  • 9 AM–12 PM82%(106 flights)
  • 12–3 PM70%(80 flights)
  • 3–6 PM57%(112 flights)
  • 6–9 PM—(3 flights)
  • 9 PM–12 AM53%(17 flights)
On-time trend by month
84%
May

Jun 47% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202547%30
July 202587%31
August 202555%31
September 202571%28
October 202553%30
November 202558%26
December 202557%28
January 202681%31
February 202680%44
March 202686%57
April 202681%31
May 202684%62
Departures on time
72%
Diverted
0.2%
Flights flown
429
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.