Guam International (GUM) Delays and On-Time Departures
Guam, TT · ranked 24th of 333 airports for on-time departures
Data through July 2026 · Last updated October 18, 2026
86.8% of the 730 flights scheduled to depart Guam (GUM) in the last 12 months left on time, 9.3 points above the US average of 77.4%.
That ranks 24th of 333 US airports tracked on this site, with 2.7% of departures cancelled.
Over 24 months, Tuesday was the most reliable day (98% on time) and February the worst month (82%).
Best time of day to fly out of Guam (GUM)
On-time departure % by scheduled departure hour (local time), last 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 84.9% | 2.2% | 730 |
| 8am–9am | 93.8% | 1.6% | 728 |
| 1pm–2pm | Limited data | 2 | |
| 8pm–9pm | Limited data | 2 | |
Airlines at GUM ranked by on-time departures
Last 12 months. Airlines with fewer than 30 departures are marked “limited data”.
| Airline | On-time departures | On-time arrivals | Cancelled | Departures |
|---|---|---|---|---|
| United Airlines | 86.8% | 89.3% | 2.7% | 730 |
80%+ good 70–79.9% fair <70% poor
Best day to fly out of GUM
On-time departures by day, 24 months.
Best month to fly out of GUM
On-time departures by month, 24 months.
Holiday travel at Guam (GUM)
On-time departures during holiday periods compared with all other days, last 24 months.
| Period | On-time departures | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 28 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 85.0% | -3.9 pts | 0.0% | 60 |
| Summer peak (Jun 15 - Aug 15) | 91.7% | +2.8 pts | 3.2% | 248 |
| All other days | 88.9% | — | 1.8% | 1,126 |
Monthly on-time departure trend at GUM
On-time departure % each month, with the 12-month US average for reference.
Routes from Guam (GUM)
Every route from GUM with its own page, by number of flights (last 12 months, on-time arrivals).
| To | On time | Cancelled | Flights |
|---|---|---|---|
| GUM → Honolulu (HNL) | 88.4% | 2.7% | 365 |
| GUM → Saipan (SPN) | 90.1% | 2.7% | 365 |