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Flight Reliability

UA 459 · United Airlines

Portland → Denver (PDX–DEN)99% of its flights flew this route. The rest (BTV–IAD, DAY–ORD) are included in these numbers.

100
Nerd Approved
WanderNerd Reliability Score
97%
Arrive within 15 minutes
9 min early
Average arrival delay
0.3%
Cancelled
13 min early
Median arrival delay

Based on 343 historical flights. Data through May 2026.

What the data says

Skip Saturday if you can.

UA 459 arrived on time 100% of the time on Tuesdays. On Saturdays: 90%.

Well ahead of the PDX–DEN route.

UA 459 arrived on time 97% of the time, versus 81% across the PDX–DEN route.

Well ahead of the United Airlines network.

UA 459 arrived on time 97% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 343 scheduled flights, only 0.3% were cancelled.

The breakdown

On-time by weekday
  • Mon98%(52 flights)
  • Tue100%(41 flights)
  • Wed100%(42 flights)
  • Thu96%(52 flights)
  • Fri100%(51 flights)
  • Sat90%(51 flights)
  • Sun94%(52 flights)
On-time by departure window
  • 3–6 AM97%(338 flights)
  • 9 AM–12 PM—(2 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
97%
May

Jun 96% → May 97% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%22
July 202595%20
August 202596%26
September 202597%30
October 202597%31
November 202597%30
December 202597%31
January 2026100%31
February 202693%28
March 2026100%31
April 202697%30
May 202697%31
Departures on time
96%
Diverted
0.3%
Flights flown
341
Months covered
12

Same route, other flights

Keep nerding

Based on 343 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.