Skip to content
WanderNerd
Check a flight

Flight Reliability

UA 1520 · United Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and UA 1520 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

91%
Arrive within 15 minutes
10 min early
Average arrival delay
0.2%
Cancelled
17 min early
Median arrival delay

Based on 483 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon94%(70 flights)
  • Tue90%(69 flights)
  • Wed90%(69 flights)
  • Thu94%(66 flights)
  • Fri90%(68 flights)
  • Sat94%(68 flights)
  • Sun86%(71 flights)
On-time by departure window
  • 6–9 AM98%(84 flights)
  • 9 AM–12 PM94%(98 flights)
  • 12–3 PM91%(264 flights)
  • 3–6 PM71%(35 flights)
On-time trend by month
98%
May

Jun 76% → May 98% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%29
July 202580%30
August 202590%31
September 202589%36
October 202589%61
November 202585%58
December 202597%32
January 2026100%31
February 202696%28
March 202691%34
April 202698%60
May 202698%51
Departures on time
91%
Diverted
0.2%
Flights flown
481
Months covered
12

Keep nerding

Based on 483 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.