How far is Mercer Island, WA from Kennewick, WA?
The driving distance from Mercer Island, WA to Kennewick, WA is about 208.5 miles (335.5 km), with a travel time of about 03h 29m by car.
- The straight-line flight distance is about 173.3 miles (278.9 km).
- For a round trip, plan for roughly 06h 59m 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 03h 29m.
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.
Chance Light Rain
Slight Chance Light Rain
Driving Route Map
The map below follows the saved road route between Mercer Island and Kennewick.
Turn-by-Turn Driving Directions
Step-by-step road directions between Mercer Island and Kennewick.
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1
Start on Southeast 42nd Street
539 ft · 28 sec · Southeast 42nd Street
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2
At the end of the road, turn right onto 86th Avenue Southeast
1325 ft · 49 sec · 86th Avenue Southeast
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3
Turn right onto Southeast 40th Street
1344 ft · 44 sec · Southeast 40th Street
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4
Turn left onto Gallagher Hill Road
1478 ft · 41 sec · Gallagher Hill Road
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5
Continue on Southeast 36th Street
2209 ft · 1 min · Southeast 36th Street
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6
Take the ramp straight toward I 90 East
1819 ft · 46 sec
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7
Merge slight left onto East Channel Bridge
102 mi · 1 hr 54 min · East Channel Bridge
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8
Take the exit slight right toward I 82 East, US 97 South: Yakima
37.8 mi · 43 min
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9
Keep slight left
64.1 mi · 1 hr 9 min
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10
Take the exit slight right toward I‑182 east, US 12 east: Richland, Pasco
5.5 mi · 6 min
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11
Take the exit slight right toward SR 240 east: Kennewick
7.3 mi · 9 min
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12
Enter the roundabout and take exit 2 toward West Columbia Drive
718 ft · 9 sec · West Columbia Drive
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13
Exit the roundabout onto West Columbia Drive
2794 ft · 1 min · West Columbia Drive
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14
Turn right onto North Fruitland Street
2961 ft · 2 min · North Fruitland Street
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15
Turn right onto West Kennewick Avenue
2790 ft · 1 min · West Kennewick Avenue
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16
Turn right onto North Newport Street
706 ft · 31 sec · North Newport Street
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17
Arrive at your destination
0 m · 1 sec · North Newport Street
Car Route Details
A richer read on the saved driving route between Mercer Island and Kennewick.
Interchange-aware route
The drive includes several ramps, exits, or merges, so checking the next few maneuvers before busy interchanges is useful.
East Channel Bridge
Merge slight left onto East Channel Bridge
102 mi · 01h 54m
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.
Chance Light Rain leaving Mercer Island and Slight Chance Light Rain near Kennewick.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Mercer Island to Kennewick?
The road trip is about 208.5 miles (335.5 km) and usually takes 03h 29m 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 110 miles from Mercer Island and 98.4 miles from Kennewick.
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 35.2 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 10:00 AM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $38.46 one way or $76.93 round trip. Estimated CO2 is about 65.3 kg one way.
What should you check before leaving?
Before you leave, expect Chance Light Rain around Mercer Island and Slight Chance Light Rain near Kennewick.
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 Mercer Island and Kennewick. Straight-line distance: 173.29 mi (278.89 km).
#1 Mercer Island
Island in the United States of America
| Population | 25,912 |
| Coordinates | 47.5706500, -122.2220700 |
| Altitude | 102 |
| Country | United States |
#2 Kennewick
The second most populous city in Benton County, Washington.
| Population | 84,515 |
| Coordinates | 46.2112500, -119.1372300 |
| Altitude | 124 |
| Country | United States |
End: North Newport Street (-119.137182, 46.21125)
Estimated Travel Time
Distance: 335 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 06h 56m |
| 40 mph (64.37 km/h) | 05h 12m |
| 50 mph (80.47 km/h) | 04h 10m |
| 60 mph (96.56 km/h) | 03h 28m |
| 70 mph (112.65 km/h) | 02h 58m |
| 80 mph (129 km/h) | 02h 36m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $5.23 | $38.46 | $76.93 |
| Mid-grade | $5.57 | $40.92 | $81.83 |
| Premium | $5.77 | $42.42 | $84.83 |
| Diesel | $5.47 | $40.18 | $80.36 |
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.