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Flight Reliability

UA 648 · United Airlines

Newark → San Francisco (EWR–SFO)94% of its flights flew this route. The rest (SFO–ORD, PBI–EWR) are included in these numbers.

70
Usually Fine
WanderNerd Reliability Score
72%
Arrive within 15 minutes
14 min
Average arrival delay
1.3%
Cancelled
4 min early
Median arrival delay

Based on 388 historical flights. Data through May 2026.

What the data says

3–6 PM has a slight edge.

Departures between 3–6 PM arrived on time 79% of the time, against 72% between 9 AM–12 PM.

Friday is doing you no favors.

UA 648 arrived on time 77% of the time on Tuesdays. On Fridays: 69%.

A bit behind the United Airlines network.

UA 648 arrived on time 72% of the time, versus 79% across the United Airlines network.

Trending in the right direction.

UA 648 arrived on time 81% of the time over the last three months in the data, compared with 69% in the three months before that.

The breakdown

On-time by weekday
  • Mon74%(53 flights)
  • Tue77%(51 flights)
  • Wed74%(50 flights)
  • Thu72%(57 flights)
  • Fri69%(55 flights)
  • Sat70%(57 flights)
  • Sun72%(57 flights)
On-time by departure window
  • 6–9 AM—(9 flights)
  • 9 AM–12 PM72%(353 flights)
  • 12–3 PM—(4 flights)
  • 3–6 PM79%(14 flights)
On-time trend by month
75%
May

Jun 60% → May 75% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202560%30
August 202573%30
September 202590%39
October 202560%30
November 202570%30
December 202548%31
January 202686%29
February 202673%26
March 202687%31
April 202680%30
May 202675%44
Departures on time
68%
Diverted
0.8%
Flights flown
380
Months covered
12

Same route, other flights

Keep nerding

Based on 388 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.