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Flight Reliability

UA 1818 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1818 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

75%
Arrive within 15 minutes
14 min
Average arrival delay
1.9%
Cancelled
7 min early
Median arrival delay

Based on 421 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(64 flights)
  • Tue94%(36 flights)
  • Wed79%(56 flights)
  • Thu76%(63 flights)
  • Fri69%(62 flights)
  • Sat80%(66 flights)
  • Sun61%(66 flights)
On-time by departure window
  • 6–9 AM90%(91 flights)
  • 12–3 PM64%(11 flights)
  • 3–6 PM77%(85 flights)
  • 6–9 PM69%(160 flights)
  • 9 PM–12 AM70%(66 flights)
On-time trend by month
84%
May

Jun 52% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202552%21
July 202553%49
August 202553%45
September 202597%30
October 202573%37
November 202583%57
December 202580%30
January 202696%23
February 202678%32
March 202686%28
April 202687%30
May 202684%31
Departures on time
74%
Diverted
0%
Flights flown
413
Months covered
12

Keep nerding

Based on 421 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.