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Flight Reliability

UA 4635 · United Airlines

GJT → Denver (GJT–DEN)100% of its flights flew this route. The rest (DEN–GSO) are included in these numbers.

51
A Little Dicey
WanderNerd Reliability Score
64%
Arrive within 15 minutes
25 min
Average arrival delay
2.8%
Cancelled
2 min
Median arrival delay

Based on 363 historical flights. Data through May 2026.

What the data says

Friday is doing you no favors.

UA 4635 arrived on time 75% of the time on Sundays and just 55% on Fridays. That gap is worth planning around.

Lagging the GJT–DEN route.

UA 4635 arrived on time 64% of the time, versus 77% across the GJT–DEN route.

Lagging the United Airlines network.

UA 4635 arrived on time 64% of the time, versus 79% across the United Airlines network.

Ticking up lately.

UA 4635 arrived on time 79% of the time over the last three months in the data, compared with 75% in the three months before that.

The breakdown

On-time by weekday
  • Mon63%(51 flights)
  • Tue63%(51 flights)
  • Wed67%(51 flights)
  • Thu63%(49 flights)
  • Fri55%(47 flights)
  • Sat63%(51 flights)
  • Sun75%(51 flights)
On-time by departure window
  • 12–3 PM—(1 flights)
  • 3–6 PM64%(350 flights)
On-time trend by month
71%
May

Jun 37% → May 71% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202537%30
July 202541%29
August 202535%29
September 202539%28
October 202571%31
November 202584%25
December 202577%30
January 202674%31
February 202675%28
March 202690%29
April 202677%30
May 202671%31
Departures on time
73%
Diverted
0.6%
Flights flown
351
Months covered
12

Same route, other flights

Keep nerding

Based on 363 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.