How far is Kennewick, WA from Mercer Island, WA?
The driving distance from Kennewick, WA to Mercer Island, WA is about 220.2 miles (354.4 km), with a travel time of about 04h 09m by car.
- The straight-line flight distance is about 173.3 miles (278.9 km).
- For a round trip, plan for roughly 08h 19m 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 09m.
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.
Slight Chance Light Rain
Chance Light Rain
Driving Route Map
The map below follows the saved road route between Kennewick and Mercer Island.
Turn-by-Turn Driving Directions
Step-by-step road directions between Kennewick and Mercer Island.
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1
Start on North Newport Street
706 ft · 38 sec · North Newport Street
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2
Turn left onto West Kennewick Avenue
2790 ft · 1 min · West Kennewick Avenue
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3
Turn left onto North Fruitland Street
2961 ft · 2 min · North Fruitland Street
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4
Turn left onto West Columbia Drive
2787 ft · 1 min · West Columbia Drive
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5
Enter the roundabout and take exit 1 toward the route
669 ft · 9 sec
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6
Exit the roundabout
6.4 mi · 8 min
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7
Keep slight right
5.1 mi · 5 min
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8
Continue straight
616 ft · 8 sec
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9
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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10
Continue straight
31 mi · 34 min
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11
Keep slight left to continue on I 90 West
103 mi · 1 hr 56 min
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12
Take the exit slight right toward East Mercer Way
1561 ft · 46 sec
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13
Turn left onto East Mercer Way
101 m · 11 sec · East Mercer Way
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14
Turn sharp right onto Southeast 36th Street
2214 ft · 1 min · Southeast 36th Street
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15
Continue on Gallagher Hill Road
1478 ft · 43 sec · Gallagher Hill Road
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16
Turn right onto Southeast 40th Street
1344 ft · 46 sec · Southeast 40th Street
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17
Turn left onto 86th Avenue Southeast
1325 ft · 53 sec · 86th Avenue Southeast
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18
Turn left onto Southeast 42nd Street
539 ft · 24 sec · Southeast 42nd Street
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19
Arrive at your destination
0 m · 1 sec · Southeast 42nd Street
Car Route Details
A richer read on the saved driving route between Kennewick and Mercer Island.
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
103 mi · 01h 56m
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.
Slight Chance Light Rain leaving Kennewick 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 Kennewick to Mercer Island?
The road trip is about 220.2 miles (354.4 km) and usually takes 04h 09m 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 109.9 miles from Kennewick and 110.3 miles from Mercer Island.
How much longer is the road route than the straight-line distance?
The direct path is about 173.3 miles (278.9 km), while the road route adds roughly 46.9 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 8:40 AM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $40.66 one way or $81.32 round trip. Estimated CO2 is about 69.1 kg one way.
What should you check before leaving?
Before you leave, expect Slight Chance Light Rain around Kennewick and Chance Light Rain near Mercer Island.
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 Kennewick and Mercer Island. Straight-line distance: 173.29 mi (278.89 km).
#1 Kennewick
The second most populous city in Benton County, Washington.
| Population | 84,515 |
| Coordinates | 46.2112500, -119.1372300 |
| Altitude | 124 |
| 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: 354 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 07h 20m |
| 40 mph (64.37 km/h) | 05h 30m |
| 50 mph (80.47 km/h) | 04h 24m |
| 60 mph (96.56 km/h) | 03h 40m |
| 70 mph (112.65 km/h) | 03h 08m |
| 80 mph (129 km/h) | 02h 44m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.23 | $40.66 | $81.32 |
| Mid-grade | $5.57 | $43.26 | $86.51 |
| Premium | $5.77 | $44.84 | $89.68 |
| Diesel | $5.47 | $42.48 | $84.96 |
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.