Airports › US Pacific Trust Territories
Airport · 12 months to July 2026
Guam International: delays and on-time record
Guam, US Pacific Trust Territories
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live airport status.
Guam International (GUM) in Guam, US Pacific Trust Territories had 730 scheduled domestic departures by reporting carriers in the 12 months to July 2026, about 2 a day, on 2 routes.
84.4% of those flights left the gate less than 15 minutes late, 8.3 points above the national departure figure of 76.1%. Flights arriving at GUM were on time 81.8% of the time, 5.8 points above the national arrival figure of 76.0%.
2.7% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 8.9 min.
United Airlines is the largest reporting carrier at GUM with 100% of departures.
On-time departures are down 6.4 points on the previous 12 months (90.8%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving GUM, air carrier 70%, late-arriving aircraft 14% and national aviation system 13%.
- On time 86.7%
- Arrived 15+ minutes late 10.4%
- Cancelled 2.7%
- Diverted 0.1%
As origin and as destination, against the nation
| Measure | Departures from GUM | Arrivals at GUM | All reported flights | GUM departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 84.4% | 81.1% | 76.1% | 90.8% |
| Arrived on time | 86.7% | 81.8% | 76.0% | 93.6% |
| Cancelled | 2.7% | 2.2% | 1.8% | 1.1% |
| Diverted | 0.1% | 0.0% | 0.3% | 0.0% |
| Average departure delay (late minutes only) | 8.9 min | 12.1 min | 17.4 min | 6.0 min |
| Arrival delay minutes per 100 flights | 756 | 1,101 | 1,684 | 476 |
| Scheduled flights | 730 | 730 | 7,043,858 | 732 |
12 months to July 2026. The first column follows flights that left GUM; the second follows flights that landed there. Year on year, on-time departures moved −6.4 pts.
Airlines at GUM
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| UA United Airlines | 730 | 100% | 86.7% | -1.8 min | 2.7% |
Departures from GUM by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 86.7%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from GUM
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| GUM–HNL | Guam to Honolulu | 365 | 85.8% | -0.3 min | 2.7% |
| GUM–SPN | Guam to Saipan | 365 | 87.7% | -3.2 min | 2.7% |
Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Delay causes
Cancellations by reported reason (20 in the period): air carrier 25%, weather 75%, national aviation system 0%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for GUM on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave GUM on time?
84.4% of the 730 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 2.7% were cancelled.
How often do flights arrive at GUM on time?
81.8% of 730 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at GUM?
Only one reporting carrier has enough departures here to report a share.
What causes delays at GUM?
For departures from GUM that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: air carrier 70%, late-arriving aircraft 14%, national aviation system 13%, extreme weather 3%, security 0%.
What time of day has the highest on-time share at GUM?
Too few departure hours carry enough flights here to compare them.
Is it getting better?
On-time departures for the 12 months to July 2026 were 84.4%, down 6.4 points on the previous 12 months (90.8%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at GUM?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.