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Route Reliability

SPN → GUM

SPN–GUM · 129 miles · SPN Airport to GUM Airport

89
Pretty Reliable
WanderNerd Reliability Score
89%
Arrive within 15 minutes
2 min
Average arrival delay
1.9%
Cancelled
365
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 89% of the time across 365 flights. No comparison to make.

What the data says

The 6–9 AM departure wins.

SPN–GUM flights departing between 6–9 AM arrived on time 92% of the time, versus 46% between 3–6 AM.

Skip Saturday if you can.

SPN–GUM flights arrived on time 94% of the time on Sundays. On Saturdays: 80%.

Recent months have been rougher.

SPN–GUM flights arrived on time 74% of the time over the last three months in the data, compared with 92% in the three months before that.

The breakdown

On-time by weekday
  • Mon86%(50 flights)
  • Tue94%(51 flights)
  • Wed86%(51 flights)
  • Thu88%(51 flights)
  • Fri92%(51 flights)
  • Sat80%(51 flights)
  • Sun94%(53 flights)
On-time by departure window
  • 3–6 AM46%(11 flights)
  • 6–9 AM92%(49 flights)
  • 9 AM–12 PM90%(296 flights)
  • 3–6 PM—(1 flights)
  • 9 PM–12 AM—(1 flights)
On-time trend by month
74%
May

Jun 100% → May 74% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 2025100%30
July 202587%31
August 202590%31
September 202597%30
October 202597%30
November 202593%30
December 202594%31
January 202687%31
February 202696%28
March 202681%31
April 202667%24
May 202674%31

Keep nerding

Based on 365 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.