Best Time to Fly TUS to SEA: On-Time Stats by Hour & Airline
Tucson International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 86.1% of Tucson (TUS) to Seattle (SEA) flights arrived on time (1,065 scheduled flights). That is 8.5 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 3 airlines on the route at 89.0%, while Alaska Airlines trailed at 84.9%.
July has been the best month (90% on time) and Sunday the weakest day of the week (83%).
0.7% of flights were cancelled, versus 1.8% nationally.
TUS to SEA 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 |
|---|---|---|---|---|
| Delta Air Lines | 89.0% | 152 min | 1.4% | 138 |
| SkyWest Airlines | 86.8% | 63 min | 0.0% | 371 |
| Alaska Airlines | 84.9% | 45 min | 0.9% | 556 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly TUS to SEA
On-time arrival % by scheduled departure hour (local time), 2,117 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 17 | |
| 6am–7am | 93.9% | 0.0% | 198 |
| 7am–8am | 89.7% | 0.5% | 389 |
| 8am–9am | 80.0% | 0.0% | 100 |
| 9am–10am | Limited data | 16 | |
| 10am–11am | Limited data | 8 | |
| 11am–12pm | 86.2% | 0.0% | 109 |
| 12pm–1pm | 89.2% | 0.0% | 259 |
| 1pm–2pm | 89.4% | 0.9% | 323 |
| 2pm–3pm | 80.3% | 0.0% | 188 |
| 3pm–4pm | 73.5% | 0.3% | 311 |
| 4pm–5pm | 76.7% | 1.0% | 199 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on TUS to SEA
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) | 87.5% | +2.8 pts | 0.0% | 40 |
| Christmas & New Year (Dec 20 - Jan 3) | 87.8% | +3.1 pts | 0.0% | 90 |
| Summer peak (Jun 15 - Aug 15) | 85.5% | +0.8 pts | 0.0% | 372 |
| All other days | 84.7% | — | 0.6% | 1,615 |
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).