How far is Pasco, WA from West Lake Sammamish, WA?
The driving distance from Pasco, WA to West Lake Sammamish, WA is about 215.1 miles (346.1 km), with a travel time of about 04h 00m by car.
- The straight-line flight distance is about 169.1 miles (272.2 km).
- For a round trip, plan for roughly 08h 01m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 6:00 AM to 8:00 AM PDT.
Reverse, save, or send this route
This drive is better planned with a longer stop or an overnight stay. Copy the route link, send it to another device, or print a clean version before you head out.
This drive is better planned with a longer stop or an overnight stay.
Flight Distance
Driving Distance
Gas Cost Calculator
Leave and Arrive Planner
Pick a departure time to see your estimated arrival and same-day return window.
Drive time stays fixed at 04h 00m.
An early departure helps you fit a real stop into the day without turning the return into a late-night drive.
You are leaving earlier than the recommended window, which gives you extra margin for breaks and traffic.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
City in Kittitas County, Washington, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Driving Route Map
The map below follows the saved road route between Pasco and West Lake Sammamish.
Turn-by-Turn Driving Directions
Step-by-step road directions between Pasco and West Lake Sammamish.
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1
Start on North 8th Avenue
640 ft · 32 sec · North 8th Avenue
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2
At the end of the road, turn right onto West Court Street
1439 ft · 45 sec · West Court Street
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3
Turn left onto North 4th Avenue
1 km · 2 min · North 4th Avenue
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4
Take the ramp left
1944 ft · 47 sec
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5
Merge slight left onto Lewis and Clark Trail
1.3 mi · 2 min · Lewis and Clark Trail
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6
Keep slight left to continue on I 182, US 12
11.8 mi · 13 min
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7
Keep slight right to continue on I 82 West, US 12 West: Prosser, Yakima
70.9 mi · 1 hr 17 min
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8
Continue straight
31 mi · 34 min
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9
Keep slight left to continue on I 90 West
97.7 mi · 1 hr 49 min
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10
Take the exit slight right toward West Lake Sammamish Parkway, Lakemont Boulevard Southeast
2039 ft · 52 sec
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11
Turn right onto West Lake Sammamish Parkway Southeast
35 m · 3 sec · West Lake Sammamish Parkway Southeast
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12
Continue on West Lake Sammamish Parkway Southeast
76 m · 8 sec · West Lake Sammamish Parkway Southeast
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13
Enter the roundabout and take exit 2 toward West Lake Sammamish Parkway Southeast
32 m · 3 sec · West Lake Sammamish Parkway Southeast
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14
Exit the roundabout onto West Lake Sammamish Parkway Southeast
1797 ft · 55 sec · West Lake Sammamish Parkway Southeast
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15
Turn right onto 177th Avenue Southeast
107 m · 18 sec · 177th Avenue Southeast
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16
Turn right onto Southeast 40th Place
72 m · 10 sec · Southeast 40th Place
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17
Arrive at your destination
0 m · 1 sec · Southeast 40th Place
Car Route Details
A richer read on the saved driving route between Pasco and West Lake Sammamish.
Highway-focused drive
Most of the mileage stays on named highways, so the important moments are ramps, exits, merges, and the final local approach.
I 90 West
Keep slight left to continue on I 90 West
97.7 mi · 01h 49m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A longer out-and-back drive
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
Sunny leaving Pasco and Mostly Sunny near West Lake Sammamish.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Pasco to West Lake Sammamish?
The road trip is about 215.1 miles (346.1 km) and usually takes 04h 00m in normal driving conditions.
Is this a same-day trip or an overnight route?
This is still possible in one day, but it becomes a long driving day. Leaving early and planning your stop window matters more here.
What is the halfway point on this route?
Kittitas is a useful midpoint, sitting about 107.4 miles from Pasco and 107.7 miles from West Lake Sammamish.
How much longer is the road route than the straight-line distance?
The direct path is about 169.1 miles (272.2 km), while the road route adds roughly 46 extra miles because roads do not follow the straight air line.
When is the best time to leave for this route?
A good departure window is usually 6:00 AM to 8:00 AM PDT. If you want a more comfortable same-day return, try to leave by 8:58 AM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $39.72 one way or $79.44 round trip. Estimated CO2 is about 67.5 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Pasco and Mostly Sunny near West Lake Sammamish.
Stop Ideas Near Kittitas
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Kittitas.
Columbia Station
Quincy, Washington
Leavenworth, Washington
Leavenworth
Flight Path Map
This map shows the direct air route between Pasco and West Lake Sammamish. Straight-line distance: 169.12 mi (272.17 km).
#1 Pasco
The third most populous city in Franklin County, Washington.
| Population | 77,095 |
| Coordinates | 46.2395800, -119.1005700 |
| Altitude | 118 |
| Country | United States |
#2 West Lake Sammamish
Census designated place
| Population | 33,929 |
| Coordinates | 47.5776000, -122.1012300 |
| Altitude | 9 |
| Country | United States |
End: West Lake Sammamish (-122.10123, 47.5776)
Estimated Travel Time
Distance: 346 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 09m |
| 40 mph (64.37 km/h) | 05h 22m |
| 50 mph (80.47 km/h) | 04h 18m |
| 60 mph (96.56 km/h) | 03h 35m |
| 70 mph (112.65 km/h) | 03h 04m |
| 80 mph (129 km/h) | 02h 40m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.23 | $39.72 | $79.44 |
| Mid-grade | $5.57 | $42.25 | $84.51 |
| Premium | $5.77 | $43.80 | $87.60 |
| Diesel | $5.47 | $41.49 | $82.99 |
Assumes 8.3 L/100 km (about 28.3 MPG). CO2 is an estimate and varies by vehicle, fuel blend, traffic, and terrain.
Prices in Washington · Jun 01, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.