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Airline Reliability

United Airlines

Carrier code UA · 1,503,166 flights in the data

79
Usually Fine
WanderNerd Reliability Score
79%
Arrive within 15 minutes
9 min
Average arrival delay
1.6%
Cancelled
7 min early
Median arrival delay

Data through May 2026.

What the data says

Morning flights do better here.

United Airlines flights departing between 3–6 AM arrived on time 92% of the time, versus 71% between 6–9 PM.

Tuesday comes out ahead.

A small edge: 82% on time on Tuesdays against 77% on Sundays.

The breakdown

On-time by weekday
  • Mon78%(215279 flights)
  • Tue82%(202845 flights)
  • Wed80%(208932 flights)
  • Thu79%(215609 flights)
  • Fri77%(217328 flights)
  • Sat80%(196908 flights)
  • Sun77%(217774 flights)
On-time by departure window
  • 12–3 AM87%(2904 flights)
  • 3–6 AM92%(26763 flights)
  • 6–9 AM87%(303372 flights)
  • 9 AM–12 PM83%(285535 flights)
  • 12–3 PM79%(290466 flights)
  • 3–6 PM71%(273497 flights)
  • 6–9 PM71%(219103 flights)
  • 9 PM–12 AM78%(73035 flights)
On-time trend by month
80%
May

Jun 73% → May 80% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202573%122045
July 202571%125916
August 202578%126165
September 202585%122155
October 202582%128497
November 202580%118670
December 202575%121429
January 202681%114406
February 202683%107604
March 202679%125896
April 202681%127083
May 202680%134809

Busiest United Airlines routes

Biggest airports

Based on 1,503,166 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.