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Flight Reliability

UA 427 · United Airlines

San Diego → Newark (SAN–EWR)100% of its flights flew this route. The rest (MCO–IAD) are included in these numbers.

81
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
1 min early
Average arrival delay
2.0%
Cancelled
11 min early
Median arrival delay

Based on 349 historical flights. Data through May 2026.

What the data says

Morning flights do better here.

UA 427 departing between 6–9 AM arrived on time 95% of the time, versus 76% between 12–3 PM.

Wednesday is the weak spot.

UA 427 arrived on time 86% of the time on Tuesdays. On Wednesdays: 78%.

A bit ahead of the United Airlines network.

UA 427 arrived on time 83% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 427 arrived on time 87% of the time over the last three months in the data, compared with 72% in the three months before that.

The breakdown

On-time by weekday
  • Mon85%(47 flights)
  • Tue86%(49 flights)
  • Wed78%(49 flights)
  • Thu80%(50 flights)
  • Fri84%(49 flights)
  • Sat86%(49 flights)
  • Sun85%(47 flights)
On-time by departure window
  • 6–9 AM95%(64 flights)
  • 12–3 PM76%(144 flights)
  • 6–9 PM—(1 flights)
  • 9 PM–12 AM86%(131 flights)
On-time trend by month
90%
May

Jun 87% → May 90% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202587%15
July 202583%30
August 202584%31
September 202586%29
October 202593%30
November 202590%30
December 202557%30
January 202679%29
February 202680%25
March 202673%30
April 202697%30
May 202690%31
Departures on time
86%
Diverted
0.6%
Flights flown
340
Months covered
12

Same route, other flights

Keep nerding

Based on 349 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.