Best Time to Fly SFO to PDX: On-Time Stats by Hour & Airline
San Francisco International → Portland International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.6% of San Francisco (SFO) to Portland (PDX) flights arrived on time (3,493 scheduled flights). That is 2.0 points above the national average of 77.6%.
Among 3 airlines, United Airlines led with 80.5% on time and SkyWest Airlines was last with 78.3%.
Over 24 months, Tuesday was the most reliable day (88% on time) and May the worst month (75%).
The cancellation rate was 0.3% (US average 1.8%).
SFO to PDX 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 |
|---|---|---|---|---|
| United Airlines | 80.5% | 62 min | 0.2% | 1,716 |
| Alaska Airlines | 78.9% | 55 min | 0.5% | 1,379 |
| SkyWest Airlines | 78.3% | 56 min | 0.3% | 392 |
| Frontier Airlines | Limited data | 6 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SFO to PDX
On-time arrival % by scheduled departure hour (local time), 7,216 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 93.8% | 0.9% | 113 |
| 7am–8am | 93.9% | 0.4% | 496 |
| 8am–9am | 89.9% | 0.9% | 569 |
| 9am–10am | 84.1% | 0.4% | 234 |
| 10am–11am | 82.5% | 0.1% | 653 |
| 11am–12pm | 71.6% | 0.2% | 416 |
| 12pm–1pm | 75.1% | 0.2% | 531 |
| 1pm–2pm | 82.3% | 0.0% | 333 |
| 2pm–3pm | 81.2% | 0.5% | 401 |
| 3pm–4pm | 74.6% | 0.3% | 336 |
| 4pm–5pm | 77.0% | 0.4% | 678 |
| 5pm–6pm | 78.3% | 0.9% | 233 |
| 6pm–7pm | 81.7% | 0.2% | 796 |
| 7pm–8pm | 83.4% | 0.3% | 333 |
| 8pm–9pm | 72.0% | 1.0% | 209 |
| 9pm–10pm | 75.1% | 0.0% | 253 |
| 10pm–11pm | 82.2% | 0.0% | 594 |
| 11pm–12am | 86.8% | 0.0% | 38 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SFO to PDX
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) | 83.8% | +1.8 pts | 0.0% | 142 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.8% | -8.2 pts | 1.2% | 255 |
| Summer peak (Jun 15 - Aug 15) | 78.9% | -3.1 pts | 0.4% | 1,256 |
| All other days | 82.0% | — | 0.3% | 5,563 |
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).