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Flight Reliability

UA 1930 · United Airlines

Washington → San Diego (IAD–SAN)

96
Nerd Approved
WanderNerd Reliability Score
94%
Arrive within 15 minutes
12 min early
Average arrival delay
0.6%
Cancelled
14 min early
Median arrival delay

Based on 334 historical flights. Data through May 2026.

What the data says

Mornings have a slight edge.

Departures between 9 AM–12 PM arrived on time 96% of the time, against 92% between 6–9 AM.

Sunday scaries are real for this one.

UA 1930 arrived on time 98% of the time on Thursdays. On Sundays: 90%.

Better than the IAD–SAN route average.

UA 1930 arrived on time 94% of the time, versus 84% across the IAD–SAN route.

Well ahead of the United Airlines network.

UA 1930 arrived on time 94% of the time, versus 79% across the United Airlines network.

The breakdown

On-time by weekday
  • Mon96%(50 flights)
  • Tue95%(37 flights)
  • Wed95%(38 flights)
  • Thu98%(51 flights)
  • Fri94%(52 flights)
  • Sat92%(50 flights)
  • Sun90%(51 flights)
On-time by departure window
  • 6–9 AM92%(146 flights)
  • 9 AM–12 PM96%(183 flights)
On-time trend by month
87%
May

Jun 93% → May 87% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202593%30
July 202590%30
August 202594%31
September 2025100%29
October 2025100%31
November 202597%29
December 202587%30
January 202691%21
February 202695%20
March 2026100%27
April 2026100%21
May 202687%30
Departures on time
93%
Diverted
0.9%
Flights flown
329
Months covered
12

Same route, other flights

Keep nerding

Based on 334 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.