How far is Adelphi, MD from Gaithersburg, MD?
The driving distance from Adelphi, MD to Gaithersburg, MD is about 20.1 miles (32.3 km), with a travel time of about 00h 30m by car.
- The straight-line flight distance is about 15.7 miles (25.2 km).
- For a round trip, plan for roughly 01h 00m of driving time before adding stops, traffic, or weather delays.
- A comfortable departure window is usually 7:00 AM to 7:00 PM EDT.
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 30m.
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.
Census-designated place in Montgomery County, Maryland, United States
Route Weather Snapshot
Check the forecast at both ends before you head out.
Widespread Frost then Sunny
Driving Route Map
The map below follows the saved road route between Adelphi and Gaithersburg.
Turn-by-Turn Driving Directions
Step-by-step road directions between Adelphi and Gaithersburg.
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1
Start on Riggs Road
596 ft · 14 sec · Riggs Road
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2
Turn left onto Edwards Way
745 ft · 28 sec · Edwards Way
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3
At the end of the road, turn left onto Adelphi Road
3021 ft · 1 min · Adelphi Road
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4
Turn right onto New Hampshire Avenue
5.7 mi · 10 min · New Hampshire Avenue
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5
Take the ramp left
1854 ft · 45 sec
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6
Merge slight left onto Intercounty Connector
4.2 mi · 5 min · Intercounty Connector
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7
Continue on Intercounty Connector
6.2 mi · 8 min · Intercounty Connector
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8
Continue straight
2718 ft · 41 sec
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9
Take the exit slight right toward MD 355: Rockville, Gaithersburg
1906 ft · 47 sec
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10
Turn right onto Frederick Road
1160 ft · 27 sec · Frederick Road
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11
Continue on South Frederick Avenue
1.6 mi · 3 min · South Frederick Avenue
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12
Turn left
26 m · 6 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 Adelphi and Gaithersburg.
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.
Intercounty Connector
Continue on Intercounty Connector
6.23 mi · 00h 08m
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.
Sunny leaving Adelphi and Widespread Frost then Sunny near Gaithersburg.
Trip Questions
Direct answers travelers usually want before committing to the drive.
How long does it take to drive from Adelphi to Gaithersburg?
The road trip is about 20.1 miles (32.3 km) and usually takes 00h 30m 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?
Aspen Hill is a useful midpoint, sitting about 9.9 miles from Adelphi and 10.1 miles from Gaithersburg.
How much longer is the road route than the straight-line distance?
The direct path is about 15.7 miles (25.2 km), while the road route adds roughly 4.4 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 EDT. If you want a more comfortable same-day return, try to leave by 7:30 PM EDT.
How much will gas cost for this route?
Using about 28.3 MPG, regular gas is estimated at $2.90 one way or $5.80 round trip. Estimated CO2 is about 6.3 kg one way.
What should you check before leaving?
Before you leave, expect Sunny around Adelphi and Widespread Frost then Sunny near Gaithersburg.
Stop Ideas Near Aspen Hill
Useful break, food, and waypoint ideas within about 15 miles of the route midpoint.
Griffith Park at City Hall
D C Government
The John Wilson Building
Town Hall Liquor And Bar
Transit and Meeting Points
Useful pickup, handoff, or rendezvous points close to Aspen Hill.
Rockville station
Washington Union Station
New Carrollton station
Union Station
Flight Path Map
This map shows the direct air route between Adelphi and Gaithersburg. Straight-line distance: 15.66 mi (25.21 km).
#1 Adelphi
Census designated place in Prince George's County, Maryland, United States
| Population | 15,086 |
| Coordinates | 39.0031700, -76.9719200 |
| Altitude | 52 |
| Country | United States |
#2 Gaithersburg
The second most populous city in Montgomery County, Maryland.
| Population | 67,741 |
| Coordinates | 39.1434400, -77.2013700 |
| Altitude | 153 |
| Country | United States |
End: (-77.201269, 39.143361)
Estimated Travel Time
Distance: 32 km by road
| Speed | Time |
|---|---|
| 30 mph (48.3 km/h) | 00h 40m |
| 40 mph (64.37 km/h) | 00h 30m |
| 50 mph (80.47 km/h) | 00h 24m |
| 60 mph (96.56 km/h) | 00h 20m |
| 70 mph (112.65 km/h) | 00h 17m |
| 80 mph (129 km/h) | 00h 15m |
Fuel, Round Trip and CO2
Estimated fuel cost and emissions for this route.
| Fuel | $/gal | One way | Round trip |
|---|---|---|---|
| Regular gas | $4.09 | $2.90 | $5.80 |
| Mid-grade | $4.60 | $3.27 | $6.53 |
| Premium | $4.95 | $3.52 | $7.03 |
| Diesel | $5.98 | $4.25 | $8.49 |
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 Maryland · Apr 21, 2026
Distance to Other Cities
Planning a road trip? See the full trip guide on Trip.ovh — stops, fuel costs, weather, and departure timing.