How far is Redmond, WA from Mercer Island, WA?
The driving distance from Redmond, WA to Mercer Island, WA is about 12.3 miles (19.8 km), with a travel time of about 00h 20m by car.
- The straight-line flight distance is about 8.5 miles (13.7 km).
- For a round trip, plan for roughly 00h 41m 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.
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.
The most populous city in Washington.
Route Weather Snapshot
Check the forecast at both ends before you head out.
Light Rain Likely
Chance Light Rain
Driving Route Map
The map below follows the saved road route between Redmond and Mercer Island.
Turn-by-Turn Driving Directions
Step-by-step road directions between Redmond and Mercer Island.
-
1
Start on 164th Avenue Northeast
609 ft · 24 sec · 164th Avenue Northeast
-
2
Enter the roundabout and take exit 1 toward Northeast 76th Street
2 m · 1 sec · Northeast 76th Street
-
3
Exit the roundabout onto Northeast 76th Street
614 ft · 21 sec · Northeast 76th Street
-
4
Turn slight left onto Leary Way
1830 ft · 58 sec · Leary Way
-
5
Take the ramp straight toward WA 520 West
2015 ft · 51 sec
-
6
Merge slight left
1.1 km · 54 sec
-
7
Take the exit slight right toward Northeast 40th Street
2259 ft · 32 sec
-
8
Keep slight left to continue on WA 520 West: Seattle
1 km · 49 sec
-
9
Merge slight left
2.8 mi · 3 min
-
10
Take the exit slight right toward I 405 South: Renton
1445 ft · 35 sec
-
11
Merge slight left
3 mi · 4 min
-
12
Take the exit slight right toward I 90: Spokane, Seattle
2527 ft · 1 min
-
13
Keep slight right to continue on I 90 West: Seattle
964 ft · 24 sec
-
14
Keep slight left to continue on I 90 West: Bellevue Way, Seattle, Mercer Island
1226 ft · 30 sec
-
15
Keep slight right to continue on I 90 West: Seattle, Mercer Island
2260 ft · 55 sec
-
16
Merge slight left
2593 ft · 37 sec
-
17
Take the exit slight right toward East Mercer Way
1561 ft · 46 sec
-
18
Turn left onto East Mercer Way
101 m · 11 sec · East Mercer Way
-
19
Turn sharp right onto Southeast 36th Street
2214 ft · 1 min · Southeast 36th Street
-
20
Continue on Gallagher Hill Road
1478 ft · 43 sec · Gallagher Hill Road
-
21
Turn right onto Southeast 40th Street
1344 ft · 46 sec · Southeast 40th Street
-
22
Turn left onto 86th Avenue Southeast
1325 ft · 53 sec · 86th Avenue Southeast
-
23
Turn left onto Southeast 42nd Street
539 ft · 24 sec · Southeast 42nd Street
-
24
Arrive at your destination
0 m · 1 sec · Southeast 42nd Street
Car Route Details
A richer read on the saved driving route between Redmond and Mercer Island.
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 405 South
Merge slight left
3.01 mi · 00h 04m
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.
Light Rain Likely leaving Redmond and Chance Light Rain near Mercer Island.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Redmond to Mercer Island?
The road trip is about 12.3 miles (19.8 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?
Bellevue is a useful midpoint, sitting about 6.2 miles from Redmond and 6.2 miles from Mercer Island.
How much longer is the road route than the straight-line distance?
The direct path is about 8.5 miles (13.7 km), while the road route adds roughly 3.8 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 7:48 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.30 one way or $4.61 round trip. Estimated CO2 is about 3.9 kg one way.
What should you check before leaving?
Before you leave, expect Light Rain Likely around Redmond and Chance Light Rain near Mercer Island.
Stop Ideas Near Bellevue
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 Bellevue.
King Street Station
Seattle (Ferry - Pier 69), Washington
Tukwila station
Edmonds station
Flight Path Map
This map shows the direct air route between Redmond and Mercer Island. Straight-line distance: 8.54 mi (13.74 km).
#1 Redmond
The second most populous city in King County, Washington.
| Population | 72,507 |
| Coordinates | 47.6739900, -122.1215100 |
| Altitude | 13 |
| Country | United States |
#2 Mercer Island
Island in the United States of America
| Population | 25,912 |
| Coordinates | 47.5706500, -122.2220700 |
| Altitude | 102 |
| Country | United States |
End: Mercer Island (-122.22207, 47.57065)
Estimated Travel Time
Distance: 20 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 24m |
| 40 mph (64.37 km/h) | 00h 18m |
| 50 mph (80.47 km/h) | 00h 14m |
| 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 | $2.30 | $4.61 |
| Mid-grade | $5.57 | $2.45 | $4.90 |
| Premium | $5.77 | $2.54 | $5.08 |
| Diesel | $5.47 | $2.41 | $4.81 |
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 · Apr 19, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.