How far is West Lake Sammamish, WA from Seattle, WA?
The driving distance from West Lake Sammamish, WA to Seattle, WA is about 12.7 miles (20.4 km), with a travel time of about 00h 16m by car.
- The straight-line flight distance is about 10.9 miles (17.6 km).
- For a round trip, plan for roughly 00h 33m 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 16m.
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
Mostly Sunny
Driving Route Map
The map below follows the saved road route between West Lake Sammamish and Seattle.
Turn-by-Turn Driving Directions
Step-by-step road directions between West Lake Sammamish and Seattle.
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1
Start on Southeast 40th Place
85 m · 14 sec · Southeast 40th Place
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2
Turn right
138 m · 36 sec
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3
Turn left onto West Lake Sammamish Parkway Southeast
1394 ft · 43 sec · West Lake Sammamish Parkway Southeast
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4
Enter the roundabout and take exit 1 toward West Lake Sammamish Parkway Southeast
28 m · 3 sec · West Lake Sammamish Parkway Southeast
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5
Exit the roundabout onto West Lake Sammamish Parkway Southeast
25 m · 2 sec · West Lake Sammamish Parkway Southeast
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6
Take the ramp slight right toward I 90 West
2081 ft · 53 sec
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7
Merge slight right
10.4 mi · 13 min
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8
Take the exit slight right toward I 5 North: Vancouver British Columbia, James Street, Madison Street
1.2 km · 1 min
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9
Keep slight left to continue on I 5 North: Vancouver British Columbia, Madison Street, Convention Center
881 ft · 22 sec
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10
Keep slight right to continue on Madison Street, Convention Place
1843 ft · 55 sec
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11
Turn left onto Madison Street
760 ft · 35 sec · Madison Street
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12
Turn left
9 m · 2 sec
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13
Arrive at your destination
0 m · 1 sec
Car Route Details
A richer read on the saved driving route between West Lake Sammamish and Seattle.
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.
I 90 West
Merge slight right
10.4 mi · 00h 13m
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 West Lake Sammamish and Mostly Sunny near Seattle.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from West Lake Sammamish to Seattle?
The road trip is about 12.7 miles (20.4 km) and usually takes 00h 16m 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 6.3 miles from West Lake Sammamish and 6.4 miles from Seattle.
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 1.8 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 7:56 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.35 one way or $4.71 round trip. Estimated CO2 is about 4 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around West Lake Sammamish and Mostly Sunny near Seattle.
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 West Lake Sammamish and Seattle. Straight-line distance: 10.94 mi (17.6 km).
#1 West Lake Sammamish
Census designated place
| Population | 33,929 |
| Coordinates | 47.5776000, -122.1012300 |
| Altitude | 9 |
| Country | United States |
#2 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 |
End: (-122.332143, 47.606309)
Estimated Travel Time
Distance: 20 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 25m |
| 40 mph (64.37 km/h) | 00h 18m |
| 50 mph (80.47 km/h) | 00h 15m |
| 60 mph (96.56 km/h) | 00h 12m |
| 70 mph (112.65 km/h) | 00h 10m |
| 80 mph (129 km/h) | 00h 09m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.23 | $2.35 | $4.71 |
| Mid-grade | $5.57 | $2.51 | $5.01 |
| Premium | $5.77 | $2.60 | $5.19 |
| Diesel | $5.47 | $2.46 | $4.92 |
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.