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Flight Reliability

UA 4319 · United Airlines

Washington → SCE (IAD–SCE)91% of its flights flew this route. The rest (CMH–IAD, ECP–IAH) are included in these numbers.

91
Nerd Approved
WanderNerd Reliability Score
87%
Arrive within 15 minutes
3 min
Average arrival delay
1.1%
Cancelled
9 min early
Median arrival delay

Based on 261 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 89% of the time, against 83% between 12–3 PM.

Mondays have been rough.

UA 4319 arrived on time 97% of the time on Tuesdays and just 82% on Mondays. That gap is worth planning around.

A bit ahead of the IAD–SCE route.

UA 4319 arrived on time 87% of the time, versus 82% across the IAD–SCE route.

Better than the United Airlines network average.

UA 4319 arrived on time 87% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon82%(38 flights)
  • Tue97%(33 flights)
  • Wed88%(33 flights)
  • Thu83%(36 flights)
  • Fri92%(38 flights)
  • Sat83%(47 flights)
  • Sun88%(33 flights)
On-time by departure window
  • 6–9 AM89%(234 flights)
  • 9 AM–12 PM—(2 flights)
  • 12–3 PM83%(12 flights)
  • 3–6 PM—(8 flights)
  • 6–9 PM—(2 flights)
On-time trend by month
93%
May

Jun 76% → May 93% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%29
July 202577%31
August 202584%31
September 202597%30
October 202590%29
November 202590%19
December 202592%13
April 202697%29
May 202693%29
Departures on time
89%
Diverted
0%
Flights flown
258
Months covered
12

Same route, other flights

Keep nerding

Based on 261 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.