Best Time to Fly SEA to RDU: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Raleigh-Durham International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.9% of Seattle (SEA) to Raleigh/Durham (RDU) flights arrived on time (918 scheduled flights). That is 2.3 points above the national average of 77.6%.
Alaska Airlines was the most punctual of the 2 airlines on the route at 82.1%, while Delta Air Lines trailed at 76.5%.
March has been the best month (89% on time) and Monday the weakest day of the week (75%).
1.0% of flights were cancelled, versus 1.8% nationally.
SEA to RDU 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 | 82.1% | 38 min | 0.7% | 554 |
| Delta Air Lines | 76.5% | 50 min | 1.4% | 364 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to RDU
On-time arrival % by scheduled departure hour (local time), 1,814 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 8am–9am | 81.6% | 0.0% | 322 |
| 9am–10am | 81.0% | 0.0% | 359 |
| 10am–11am | 91.2% | 5.6% | 36 |
| 11am–12pm | Limited data | 4 | |
| 3pm–4pm | 81.4% | 0.6% | 644 |
| 4pm–5pm | 69.1% | 0.0% | 55 |
| 9pm–10pm | 71.8% | 1.0% | 288 |
| 10pm–11pm | 82.7% | 0.9% | 105 |
| 11pm–12am | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to RDU
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) | Limited data | 29 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 80.0% | -3.0 pts | 1.2% | 86 |
| Summer peak (Jun 15 - Aug 15) | 68.8% | -14.2 pts | 0.8% | 371 |
| All other days | 83.0% | — | 0.5% | 1,328 |
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).