How far is Seattle, WA from West Lake Sammamish, WA?
The driving distance from Seattle, WA to West Lake Sammamish, WA is about 13.5 miles (21.7 km), with a travel time of about 00h 20m by car.
- The straight-line flight distance is about 10.9 miles (17.6 km).
- For a round trip, plan for roughly 00h 40m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM PDT.
Reverse, save, or send this route
This is an easy same-day return drive. Copy the route link, send it to another device, or print a clean version before you head out.
This is an easy same-day return drive.
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 00h 20m.
This is a short drive, so your comfort window is wide. Traffic and current weather matter more than the clock.
This departure sits inside the recommended comfort window for the route.
Halfway Point
A useful midpoint for breaks, coffee, or meeting in the middle.
Island in the United States of America
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 Seattle and West Lake Sammamish.
Turn-by-Turn Driving Directions
Step-by-step road directions between Seattle and West Lake Sammamish.
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1
Start on the route
9 m · 8 sec
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2
Turn left onto Madison Street
62 m · 11 sec · Madison Street
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3
Turn right onto 4th Avenue
94 m · 15 sec · 4th Avenue
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4
Turn right onto Spring Street
647 ft · 26 sec · Spring Street
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5
Take the ramp right toward I 5 South: Portland
1151 ft · 28 sec
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6
Continue straight
3180 ft · 1 min
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7
Keep slight left to continue on I 90 East, I 5 South: Bellevue, Portland
45 m · 2 sec
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8
Keep slight left to continue on I 90 East: Bellevue, Spokane
2257 ft · 55 sec
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9
Merge slight left
1.6 km · 1 min
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10
Keep slight left to continue on Mount Baker Ridge Tunnel
9.5 mi · 12 min · Mount Baker Ridge Tunnel
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11
Take the exit slight right toward West Lake Sammamish Parkway, Lakemont Boulevard Southeast
984 ft · 24 sec
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12
Keep slight left to continue on West Lake Sammamish Parkway Southeast
3181 ft · 1 min
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13
Turn straight onto West Lake Sammamish Parkway Southeast
760 ft · 22 sec · West Lake Sammamish Parkway Southeast
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14
Continue on West Lake Sammamish Parkway Southeast
35 m · 3 sec · West Lake Sammamish Parkway Southeast
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15
Continue on West Lake Sammamish Parkway Southeast
76 m · 8 sec · West Lake Sammamish Parkway Southeast
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16
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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17
Exit the roundabout onto West Lake Sammamish Parkway Southeast
1797 ft · 55 sec · West Lake Sammamish Parkway Southeast
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18
Turn right onto 177th Avenue Southeast
107 m · 18 sec · 177th Avenue Southeast
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19
Turn right onto Southeast 40th Place
72 m · 10 sec · Southeast 40th Place
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20
Arrive at your destination
0 m · 1 sec · Southeast 40th Place
Car Route Details
A richer read on the saved driving route between Seattle and West Lake Sammamish.
Turn-heavy local drive
The route has frequent decision points for its length, so lane choice and turn timing will matter more than cruising speed.
Mount Baker Ridge Tunnel
Keep slight left to continue on Mount Baker Ridge Tunnel
9.51 mi · 00h 12m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A short regional drive
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
Mostly Sunny leaving Seattle 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 Seattle to West Lake Sammamish?
The road trip is about 13.5 miles (21.7 km) and usually takes 00h 20m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route is short enough to handle as a quick errand, commute, or easy same-day return without much planning overhead.
What is the halfway point on this route?
Mercer Island is a useful midpoint, sitting about 6.7 miles from Seattle and 6.8 miles from West Lake Sammamish.
How much longer is the road route than the straight-line distance?
The direct path is about 10.9 miles (17.6 km), while the road route adds roughly 2.6 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 7:00 AM to 7:00 PM PDT. If you want a more comfortable same-day return, try to leave by 7:50 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.51 one way or $5.02 round trip. Estimated CO2 is about 4.3 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Seattle and Mostly Sunny near West Lake Sammamish.
Stop Ideas Near Mercer Island
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Tukwila Community Center
Renton City Human Services
Renton City Hall
Renton Police Department
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Mercer Island.
King Street Station
Seattle (Ferry - Pier 69), Washington
Tukwila station
Edmonds station
Flight Path Map
This map shows the direct air route between Seattle and West Lake Sammamish. Straight-line distance: 10.94 mi (17.6 km).
#1 Seattle
The eighteenth most populous city in the United States and the center of the Seattle metropolitan area.
| Population | 769,714 |
| Coordinates | 47.6062100, -122.3320700 |
| Altitude | 56 |
| 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: 22 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 26m |
| 40 mph (64.37 km/h) | 00h 20m |
| 50 mph (80.47 km/h) | 00h 16m |
| 60 mph (96.56 km/h) | 00h 13m |
| 70 mph (112.65 km/h) | 00h 11m |
| 80 mph (129 km/h) | 00h 10m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.23 | $2.51 | $5.02 |
| Mid-grade | $5.57 | $2.67 | $5.34 |
| Premium | $5.77 | $2.77 | $5.54 |
| Diesel | $5.47 | $2.62 | $5.25 |
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.