Seattle (SEA) to Pasco (PSC) flights
Horizon Air, SkyWest Airlines fly nonstop from Seattle-Tacoma International Airport to Tri Cities Airport, with about 52 flights a week in July 2026. The 172-mile flight takes about 1h 1m gate to gate.
- Distance
- 172 mi · 277 km
- Flight time
- 1h 1m
- Airlines
- 2
- Seats filled
- 78%
Airlines flying SEA to PSC
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Horizon Air | 31 | Embraer E175 | 60,172 | 56m |
| SkyWest Airlines | 21 | Embraer E175 | 84,965 | 1h 4m |
| Alaska AirlinesSeasonal or ended | n/a | Boeing 737-800, Boeing 737-900ER, Boeing 737 MAX 9 | 28,364 | 1h 2m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to PSC flight schedule
12 flight numbers flew this route in August 2026, 3 of them almost daily. The first usually leaves at 8:52am and the last at 10:49pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| AS 2195Alaska Airlines · operated by Horizon Air | 8:52am | 9:53am | 18 | 88% |
| AS 3140Alaska Airlines · operated by SkyWest Airlines | 9:06am | 10:12am | 13 | 85% |
| DL 3992Delta Air Lines · operated by SkyWest Airlines | 10:35am | 11:45am | 31 | 85% |
| AS 2306Alaska Airlines · operated by Horizon Air | 11:20am | 12:19pm | 18 | 54% |
| AS 2179Alaska Airlines · operated by Horizon Air | 12:09pm | 1:14pm | 13 | 69% |
| DL 3891Delta Air Lines · operated by SkyWest Airlines | 1:30pm | 2:44pm | 31 | 84% |
| AS 3378Alaska Airlines · operated by SkyWest Airlines | 3:35pm | 4:40pm | 13 | 62% |
| AS 2367Alaska Airlines · operated by Horizon Air | 4:28pm | 5:27pm | 18 | 78% |
| AS 2154Alaska Airlines · operated by Horizon Air | 8:00pm | 9:01pm | 13 | 77% |
| AS 2403Alaska Airlines · operated by Horizon Air | 10:44pm | 11:43pm | 17 | 83% |
| AS 3217Alaska Airlines · operated by SkyWest Airlines | 10:46pm | 11:49pm | 13 | 92% |
| DL 4017Delta Air Lines · operated by SkyWest Airlines | 10:49pm | 11:59pm | 31 | 82% |
Is SEA to PSC on time?
From September 2025 to August 2026, 83% of 2,662 flights arrived within 15 minutes of schedule and 1.1% were cancelled. Flights leaving around 9am were the most punctual (91%), those around 11am the least (73%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (44%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Alaska Airlines | 1,547 | 82% | 8 min | 1.7% |
| Delta Air Lines | 1,115 | 85% | 12 min | 0.3% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 8am to 9am | 107 | 85% | |
| 9am to 10am | 213 | 91% | |
| 10am to 11am | 195 | 86% | |
| 11am to 12pm | 246 | 73% | |
| 12pm to 1pm | 114 | 88% | |
| 1pm to 2pm | 117 | 82% | |
| 2pm to 3pm | 96 | 87% | |
| 3pm to 4pm | 283 | 86% | |
| 4pm to 5pm | 155 | 76% | |
| 5pm to 6pm | 89 | 86% | |
| 7pm to 8pm | 145 | 81% | |
| 8pm to 9pm | 149 | 88% | |
| 9pm to 10pm | 194 | 85% | |
| 10pm to 11pm | 327 | 81% | |
| 11pm to 12am | 212 | 85% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 254 | 16,681 | |
| September 2025 | 226 | 14,920 | |
| October 2025 | 229 | 14,692 | |
| November 2025 | 214 | 14,566 | |
| December 2025 | 232 | 16,517 | |
| January 2026 | 204 | 14,183 | |
| February 2026 | 182 | 12,737 | |
| March 2026 | 196 | 13,154 | |
| April 2026 | 209 | 12,847 | |
| May 2026 | 269 | 16,183 | |
| June 2026 | 224 | 13,477 | |
| July 2026 | 232 | 13,663 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.