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Flight Reliability

UA 4753 · United Airlines

Boise → San Francisco (BOI–SFO)84% of its flights flew this route. The rest (ATW–DEN, LAX–SBP) are included in these numbers.

68
Usually Fine
WanderNerd Reliability Score
68%
Arrive within 15 minutes
18 min
Average arrival delay
1.0%
Cancelled
4 min early
Median arrival delay

Based on 293 historical flights. Data through May 2026.

What the data says

The late departure is the smart one here.

UA 4753 departing between 6–9 PM arrived on time 70% of the time, versus 41% between 3–6 PM.

Thursdays have been rough.

UA 4753 arrived on time 83% of the time on Tuesdays and just 59% on Thursdays. That gap is worth planning around.

Lagging the BOI–SFO route.

UA 4753 arrived on time 68% of the time, versus 76% across the BOI–SFO route.

Lagging the United Airlines network.

UA 4753 arrived on time 68% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon75%(44 flights)
  • Tue83%(29 flights)
  • Wed66%(44 flights)
  • Thu59%(44 flights)
  • Fri62%(47 flights)
  • Sat76%(38 flights)
  • Sun61%(44 flights)
On-time by departure window
  • 6–9 AM—(4 flights)
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(1 flights)
  • 3–6 PM41%(22 flights)
  • 6–9 PM70%(262 flights)
On-time trend by month
37%
May

Jul 37% → May 37% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202537%19
August 202584%25
September 202574%23
October 202568%31
November 202579%29
December 202572%29
January 202670%27
February 202681%26
March 202671%31
April 202657%30
May 202637%19
Departures on time
71%
Diverted
0%
Flights flown
290
Months covered
12

Same route, other flights

Keep nerding

Based on 293 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.