85% of flights leaving St. George (SGU) arrived on time over the past 12 months, 9 points better than the national average of 76%. About 13 flights leave SGU on a typical day; 0.2% were cancelled. 87% pushed back from the gate on time, so most of the lateness is already there when the flight leaves the gate.
At a glance
- Best hour to fly: 5 a.m. (91% on time). Worst: 1 p.m. (79%).
- Best month: December (90%). Worst: June (80%).
- Most reliable airline here: Delta Air Lines (93%), vs United Airlines at 80%.
- Biggest delay cause: the airlines themselves (56% of delay minutes).
- Year on year: about the same (85% → 85%).
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for flights leaving SGU: when a flight was late, it was under 45 minutes late 50% of the time. About 1 in 17 flights landed an hour or more late, and 1 in 54 three hours or more; 0.2% were cancelled outright.
- On time or early85%
- 15–30 min late4.9%
- 30–60 min late3.9%
- 1–2 hours late2.8%
- 2–3 hours late1.1%
- 3+ hours late1.9%
- Diverted0.4%
- Cancelled0.2%
Share of all 4,698 scheduled flights, past 12 months, by arrival time against schedule.
Best time of day to fly out of SGU
Departure time makes a real difference at SGU. Flights scheduled to leave at 5 a.m. arrived on time 91% of the time; at 1 p.m. it was 79%, a 12-point gap. Taken together, early departures (5–9 a.m.) ran 91% on time against 79% for the evening bank (5–10 p.m.). Early planes usually start the day at the airport, so they haven't had a chance to pick up delays elsewhere. By evening a late inbound aircraft, a crew running out of duty hours or an afternoon thunderstorm can push one late flight into the next. Cancellations cluster too: 11 a.m. departures were cancelled 0.4% of the time, against 0.2% overall.
Hour × month
Combine the two and the spread is wider still. The most reliable combination at SGU was a 6 a.m. departure in May (97% on time); the least, 1 p.m. in August (74%). If you can only move one thing, move the hour. Departure hour usually shifts the odds more than the month does.
Each cell: on-time rate for that departure hour in that calendar month, 2023–2026. Find your travel month, then look along the row for the greenest hour.
Best and worst months
June is the hardest month at SGU, with 80% of flights on time across 2023–2026; December is the best at 90%. Summer (June–August) runs 6 points worse than autumn: heavy schedules, peak loads and afternoon thunderstorms. Cancellations peak in November (0.6% of flights).
Airlines at SGU
Delta Air Lines runs 37% of departures from SGU. Among airlines with at least 1,000 departures here, Delta Air Lines was the most reliable (93% on time) and United Airlines the least (80%), a 13-point difference. On a route where both fly, that difference is worth more than a small fare gap.
| Airline | Departures | On time | Left on time | Cancelled | Typical arrival |
|---|---|---|---|---|---|
| Delta Air Lines | 1,727 | 93% | 94% | 0.2% | −14 min |
| American Airlines | 1,587 | 81% | 82% | 0.3% | −9 min |
| United Airlines | 1,384 | 80% | 84% | 0.2% | −8 min |
Why flights are late at SGU
Airlines report a cause for every flight that arrives 15 or more minutes late. At SGU, 56% of delay minutes came from the airlines themselves: crew, maintenance, cleaning, fueling and baggage. Next is late-arriving aircraft at 22%.
The average taxi from gate to takeoff is 21 minutes, longer than at most large U.S. airports. Airlines pad schedules for it, but a long queue on a busy afternoon still eats into the buffer.
Month by month
Over the latest 12 months 85% of SGU departures were on time, against 85% in the 12 months before: essentially unchanged. The best recent month was November 2025 (90%); the worst, June 2026 (78%).
Worst cancellation days
The worst single day in the past year was Saturday, Jan 24, 2026, when 17% of 12 scheduled departures were cancelled. Days like that are usually a major storm, a system outage or a holiday peak hitting bad weather. No average predicts them, so on a stormy forecast, check your airline's travel waivers.
| Date | Departures | Cancelled | On time |
|---|---|---|---|
| Jan 24, 2026 | 12 | 17% | 58% |
| Sep 20, 2025 | 10 | 10% | 90% |
| Aug 15, 2026 | 11 | 9% | 82% |
| Nov 12, 2025 | 13 | 8% | 92% |
| Aug 14, 2026 | 13 | 8% | 38% |
| Nov 13, 2025 | 14 | 7% | 93% |
| Mar 6, 2026 | 14 | 7% | 79% |
| Nov 9, 2025 | 14 | 7% | 79% |
| Feb 20, 2026 | 14 | 7% | 79% |
| Oct 25, 2025 | 13 | 0% | 92% |
Last flights of the day
The last flight of the day is a different bet. Across routes from SGU, each airline's final departure was cancelled 0.1% of the time, against 0.2% for its earlier flights, so at SGU the last flight is actually the steadier one. 1.9% of last flights landed 3+ hours late. The riskiest last flight out was American Airlines to Dallas (0.3% cancelled).
| Last flight to | Airline | Leaves | Cancelled | 3h+ late | On time |
|---|---|---|---|---|---|
| DFW Dallas | American Airlines | 11:09 a.m. | 0.3% | 3.5% | 67% |
| DEN Denver | United Airlines | 5:24 p.m. | 0.3% | 3.1% | 74% |
| PHX Phoenix | American Airlines | 12:10 p.m. | 0.0% | 0.9% | 80% |
| SLC Salt Lake City | Delta Air Lines | 3:20 p.m. | 0.0% | 0.3% | 91% |
Each airline's last scheduled departure of the day on a route, on days it flies the route at least twice; past 12 months. Riskiest first.
Tips for flying out of SGU
- Book the earliest departure you can live with. At SGU the 5 a.m. flights do best.
- Traveling in June? Leave extra slack for anything that can't move: cruises, weddings, the last connection of the day.
- Choosing between airlines? Delta Air Lines has the better record here.
- Delayed already? Most delays at SGU come from the airlines themselves. If your inbound plane is late, your flight will be too, whatever the board says.
Routes from SGU
Least reliable first. Routes with at least 365 flights a year.
| To | Flights | On time | Cancelled | Typical arrival |
|---|---|---|---|---|
| DEN Denver | 1,072 | 78% | 0.2% | −8 min |
| DFW Dallas | 698 | 79% | 0.4% | −10 min |
| PHX Phoenix | 889 | 82% | 0.1% | −8 min |
| SLC Salt Lake City | 1,727 | 93% | 0.2% | −14 min |
Flights into SGU
Arriving rather than leaving? These are the routes into St George, least reliable first. The weakest is from Dallas (75% on time).
| From | Flights | On time | Cancelled |
|---|---|---|---|
| DFW Dallas | 698 | 75% | 0.4% |
| DEN Denver | 1,072 | 79% | 0.6% |
| PHX Phoenix | 889 | 83% | 0.1% |
| SLC Salt Lake City | 1,727 | 91% | 0.2% |
Questions about SGU delays
What is the best time to fly out of SGU?
Flights scheduled at 5 a.m.: over the past year 91% of SGU departures at that hour arrived on time, against 79% at 1 p.m., the worst hour.
What month has the most flight delays at SGU?
June (80% on time). December is the best month (90%).
Which airline is most on time at SGU?
Delta Air Lines: 93% of its SGU departures arrived on time over the past year. United Airlines had the weakest record at 80%.
Why are flights delayed at SGU?
The biggest cause was the airlines themselves (56% of delay minutes): crew, maintenance, cleaning, fueling and baggage. Then late-arriving aircraft (22%).
How often are flights cancelled at SGU?
0.2% of scheduled departures over the past 12 months, peaking in November at 0.6%.
Hours are scheduled local departure times. "On time" means arriving less than 15 minutes late at the destination; cancelled and diverted flights count as not on time. Method.