Best Time to Fly PDX to SAN: On-Time Stats by Hour & Airline
Portland International → San Diego International
Data through July 2026 · Last updated October 18, 2026
1,771 flights were scheduled from Portland (PDX) to San Diego (SAN) in the last 12 months, and 77.0% of those that flew arrived on time, 0.6 points below the US average of 77.6%.
SkyWest Airlines was the most punctual of the 3 airlines on the route at 90.0%, while Southwest Airlines trailed at 70.6%.
April has been the best month (89% on time) and Friday the weakest day of the week (72%).
0.8% of flights were cancelled, versus 1.8% nationally.
PDX to SAN 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 |
|---|---|---|---|---|
| SkyWest Airlines | 90.0% | 68 min | 0.0% | 30 |
| Alaska Airlines | 77.4% | 39 min | 0.9% | 1,581 |
| Southwest Airlines | 70.6% | 28 min | 0.0% | 160 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PDX to SAN
On-time arrival % by scheduled departure hour (local time), 3,549 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 31 | |
| 7am–8am | 84.3% | 0.7% | 615 |
| 8am–9am | 80.6% | 2.7% | 74 |
| 9am–10am | 77.8% | 0.0% | 54 |
| 10am–11am | 82.3% | 0.9% | 685 |
| 11am–12pm | 88.1% | 0.0% | 67 |
| 12pm–1pm | 73.3% | 0.0% | 30 |
| 1pm–2pm | 54.5% | 0.0% | 55 |
| 2pm–3pm | 81.0% | 0.9% | 682 |
| 3pm–4pm | Limited data | 14 | |
| 4pm–5pm | 80.0% | 0.0% | 76 |
| 5pm–6pm | 74.3% | 0.9% | 461 |
| 6pm–7pm | 59.3% | 1.0% | 194 |
| 7pm–8pm | Limited data | 17 | |
| 8pm–9pm | 73.6% | 3.7% | 134 |
| 9pm–10pm | 81.6% | 1.7% | 360 |
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 SAN
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) | 69.2% | -12.6 pts | 1.3% | 79 |
| Christmas & New Year (Dec 20 - Jan 3) | 57.7% | -24.1 pts | 2.5% | 162 |
| Summer peak (Jun 15 - Aug 15) | 73.9% | -7.9 pts | 1.1% | 642 |
| All other days | 81.8% | — | 0.9% | 2,666 |
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).