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Flight Reliability

UA 4733 · United Airlines

Boise → San Francisco (BOI–SFO)95% of its flights flew this route. The rest (BOI–DEN) are included in these numbers.

83
Pretty Reliable
WanderNerd Reliability Score
75%
Arrive within 15 minutes
11 min
Average arrival delay
0%
Cancelled
3 min early
Median arrival delay

Based on 365 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 4733 departing between 9 AM–12 PM arrived on time 78% of the time, versus 62% between 12–3 PM.

Friday is doing you no favors.

UA 4733 arrived on time 90% of the time on Saturdays and just 65% on Fridays. That gap is worth planning around.

A bit behind the United Airlines network.

UA 4733 arrived on time 75% of the time, versus 79% across the United Airlines network.

It basically never cancels.

Out of 365 scheduled flights, only 0.0% were cancelled.

The breakdown

On-time by weekday
  • Mon65%(52 flights)
  • Tue87%(52 flights)
  • Wed79%(52 flights)
  • Thu73%(52 flights)
  • Fri65%(52 flights)
  • Sat90%(52 flights)
  • Sun68%(53 flights)
On-time by departure window
  • 9 AM–12 PM78%(312 flights)
  • 12–3 PM62%(53 flights)
On-time trend by month
39%
May

Jun 90% → May 39% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202590%30
July 202568%31
August 202594%31
September 202570%30
October 202581%31
November 202573%30
December 202574%31
January 202690%31
February 202671%28
March 202684%31
April 202670%30
May 202639%31
Departures on time
80%
Diverted
0%
Flights flown
365
Months covered
12

Same route, other flights

Keep nerding

Based on 365 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.