How far is Lake Oswego, OR from Monmouth, OR?
The driving distance from Lake Oswego, OR to Monmouth, OR is about 55.9 miles (89.9 km), with a travel time of about 01h 18m by car.
- The straight-line flight distance is about 48.2 miles (77.5 km).
- For a round trip, plan for roughly 02h 36m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 8:00 AM to 10:00 AM PDT.
Reverse, save, or send this route
This route works well as a day trip with time at the destination. Copy the route link, send it to another device, or print a clean version before you head out.
This route works well as a day trip with time at the destination.
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 01h 18m.
A morning start gives you useful time at the destination and keeps the return out of the late evening.
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 Oregon, USA
Route Weather Snapshot
Check the forecast at both ends before you head out.
Mostly Sunny
Partly Sunny
Driving Route Map
The map below follows the saved road route between Lake Oswego and Monmouth.
Turn-by-Turn Driving Directions
Step-by-step road directions between Lake Oswego and Monmouth.
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1
Start on the route
65 m · 18 sec
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2
Turn right onto A Avenue
1156 ft · 35 sec · A Avenue
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3
Continue on Country Club Road
1178 ft · 27 sec · Country Club Road
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4
Continue on Country Club Road
1.5 mi · 3 min · Country Club Road
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5
Turn left onto Boones Ferry Road
1.2 km · 1 min · Boones Ferry Road
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6
Turn right onto Kruse Way
1.5 mi · 3 min · Kruse Way
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7
Take the ramp left toward I 5 South: Salem
2171 ft · 41 sec
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8
Merge slight left
31.6 mi · 37 min
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9
Take the exit slight right toward OR 99E Business: Salem Parkway
2557 ft · 1 min
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10
Merge slight right onto Doctor Martin Luther King Junior Parkway
3 mi · 5 min · Doctor Martin Luther King Junior Parkway
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11
Continue on Commercial Street Northeast
1.1 mi · 3 min · Commercial Street Northeast
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12
Continue on D Street Northeast
136 m · 26 sec · D Street Northeast
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13
Turn left onto Front Street Northeast
976 ft · 44 sec · Front Street Northeast
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14
Continue on Front Street Northeast
87 m · 15 sec · Front Street Northeast
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15
Turn left onto Union Street Northeast
150 m · 23 sec · Union Street Northeast
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16
Turn right onto Commercial Street Northeast
135 m · 19 sec · Commercial Street Northeast
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17
Turn right onto Marion Street Bridge
2999 ft · 1 min · Marion Street Bridge
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18
Continue on Salem Dallas Highway Northwest
5 mi · 7 min · Salem Dallas Highway Northwest
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19
Turn left onto Independence Highway
5.5 mi · 8 min · Independence Highway
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20
Continue on North Main Street
1.4 km · 1 min · North Main Street
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21
Turn right onto Monmouth Street
1.5 mi · 2 min · Monmouth Street
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22
Continue on Monmouth Independence Highway
1874 ft · 32 sec · Monmouth Independence Highway
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23
Continue on Main Street East
1.1 km · 1 min · Main Street East
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24
Arrive at your destination
0 m · 1 sec · Main Street East
Car Route Details
A richer read on the saved driving route between Lake Oswego and Monmouth.
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 5 South
Merge slight left
31.6 mi · 00h 37m
Route Summary
A quick read on whether this route feels easy, ambitious, or worth planning around.
A comfortable day-trip route
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
Mostly Sunny leaving Lake Oswego and Partly Sunny near Monmouth.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Lake Oswego to Monmouth?
The road trip is about 55.9 miles (89.9 km) and usually takes 01h 18m in normal driving conditions.
Is this a same-day trip or an overnight route?
This route works well as a day trip. You can leave in the morning, spend meaningful time at the destination, and still return the same day.
What is the halfway point on this route?
Gervais is a useful midpoint, sitting about 27.9 miles from Lake Oswego and 28 miles from Monmouth.
How much longer is the road route than the straight-line distance?
The direct path is about 48.2 miles (77.5 km), while the road route adds roughly 7.7 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 8:00 AM to 10:00 AM PDT. If you want a more comfortable same-day return, try to leave by 3:54 PM PDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $9.75 one way or $19.51 round trip. Estimated CO2 is about 17.5 kg one way.
What should you check before leaving?
Before you leave, expect Mostly Sunny around Lake Oswego and Partly Sunny near Monmouth.
Stop Ideas Near Gervais
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Salem city park
Woodburn City Hall
Palmer Creek Lodge Community Event Center
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Gervais.
Woodburn, OR
Salem station
Oregon City station
Portland, OR
Flight Path Map
This map shows the direct air route between Lake Oswego and Monmouth. Straight-line distance: 48.14 mi (77.47 km).
#1 Lake Oswego
A city in Clackamas County, Oregon.
| Population | 39,821 |
| Coordinates | 45.4206700, -122.6706500 |
| Altitude | 55 |
| Country | United States |
#2 Monmouth
City in Oregon, USA
| Population | 10,615 |
| Coordinates | 44.8484500, -123.2339900 |
| Altitude | 62 |
| Country | United States |
End: Monmouth (-123.23399, 44.84845)
Estimated Travel Time
Distance: 90 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 01h 51m |
| 40 mph (64.37 km/h) | 01h 23m |
| 50 mph (80.47 km/h) | 01h 07m |
| 60 mph (96.56 km/h) | 00h 55m |
| 70 mph (112.65 km/h) | 00h 47m |
| 80 mph (129 km/h) | 00h 41m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.95 | $9.75 | $19.51 |
| Mid-grade | $5.34 | $10.52 | $21.03 |
| Premium | $5.57 | $10.97 | $21.93 |
| Diesel | $6.37 | $12.54 | $25.08 |
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 Oregon · May 12, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.