Best Time to Fly PDX to SLC: On-Time Stats by Hour & Airline
Portland International → Salt Lake City International
Data through July 2026 · Last updated October 18, 2026
2,374 flights were scheduled from Portland (PDX) to Salt Lake City (SLC) in the last 12 months, and 89.2% of those that flew arrived on time, 11.6 points above the US average of 77.6%.
Alaska Airlines was the most punctual of the 4 airlines on the route at 93.6%, while Frontier Airlines trailed at 62.9%.
May has been the best month (94% on time) and Sunday the weakest day of the week (87%).
1.1% of flights were cancelled, versus 1.8% nationally.
PDX to SLC on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlines | 93.6% | 34 min | 0.0% | 47 |
| Delta Air Lines | 90.9% | 62 min | 1.5% | 1,699 |
| SkyWest Airlines | 85.6% | 59 min | 0.2% | 593 |
| Frontier Airlines | 62.9% | 85 min | 0.0% | 35 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PDX to SLC
On-time arrival % by scheduled departure hour (local time), 4,896 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 97.2% | 0.1% | 730 |
| 7am–8am | 84.8% | 0.0% | 243 |
| 8am–9am | Limited data | 9 | |
| 9am–10am | 90.5% | 2.2% | 409 |
| 10am–11am | 92.5% | 0.3% | 616 |
| 11am–12pm | 88.3% | 0.6% | 180 |
| 12pm–1pm | 89.8% | 0.0% | 49 |
| 1pm–2pm | 87.3% | 0.7% | 728 |
| 2pm–3pm | 93.3% | 0.7% | 136 |
| 3pm–4pm | Limited data | 27 | |
| 4pm–5pm | Limited data | 2 | |
| 5pm–6pm | 85.7% | 0.2% | 953 |
| 6pm–7pm | 79.4% | 0.8% | 264 |
| 7pm–8pm | 86.3% | 1.4% | 550 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PDX to SLC
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 85.3% | -5.4 pts | 0.0% | 95 |
| Christmas & New Year (Dec 20 - Jan 3) | 82.3% | -8.4 pts | 1.0% | 200 |
| Summer peak (Jun 15 - Aug 15) | 83.8% | -6.9 pts | 0.9% | 967 |
| All other days | 90.7% | — | 0.6% | 3,634 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).