Traveling from Forest Hill to San Antonio covers 390.6 miles of Texas landscape, a journey that typically takes about 6 hours and 10 minutes behind the wheel. Because this route stays entirely within the Great Plains, you can expect consistent terrain as you head south. A single-day trip is certainly achievable if you are comfortable with a full day of driving, making an overnight stay optional rather than strictly necessary. Budgeting approximately $58 for fuel will keep you moving throughout the excursion. Since this drive consists of turn-heavy local roads rather than major interstates, plan for a slower, more engaged pace than a standard highway cruise.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
184.8 miles from Forest Hill, TX
A natural place for your longest stop of the day
, about 3h 24m into the drive
.
Step-by-step road directions between Forest Hill, TX and San Antonio, TX.
1
Start on County Road 35050
231 ft·15 sec·County Road 35050
2
Turn left onto FM 38
3.5 mi·8 min·FM 38
3
Turn right onto US 82
21 mi·23 min·US Highway 82 West
4
Take the exit
0.1 mi·19 sec
Exit 670Toward TX 121: Randolph, Trenton
5
Turn straight onto West US Highway 82
0.2 mi·29 sec·West US Highway 82
6
Turn left onto TX 121
2.0 mi·2 min·North State Highway 121
7
Turn right onto TX 56; TX 121
0.5 mi·37 sec·West Sam Rayburn Drive
8
Turn slight left onto TX 121
17 mi·18 min·South State Highway 121
9
Continue on TX 121
15 mi·17 min·Sam Rayburn Highway
10
Keep slight left at fork
0.8 mi·1 min
Toward US 75 South, TX 121 SouthUse the straight / slight right lanes.
11
Merge onto US 75; TX 121
35 mi·37 min·Central Expressway
Use the straight / slight right lanes.
12
Take the exit
501 ft·12 sec
Exit 284CToward Downtown, Good-Latimer ExpresswayUse the slight left lane.
13
Continue on North Central Expressway
0.7 mi·1 min·North Central Expressway
Use the left / straight lanes.
14
Turn right onto Elm Street
304 ft·10 sec·Elm Street
15
Turn left onto North Pearl Expressway
0.2 mi·28 sec·North Pearl Expressway
Use the straight lane.
16
Turn right onto Young Street
0.1 mi·19 sec·Young Street
17
Turn left onto South Harwood Street
315 ft·8 sec·South Harwood Street
Use the left lane.
18
Turn right onto Canton Street
0.4 mi·47 sec·Canton Street
19
Take the ramp
0.3 mi·38 sec
Toward I 30 West
20
Keep slight left at fork
0.1 mi·14 sec
Toward I 35E South, I 35E North: Waco, Denton
21
Keep slight left at fork
221 ft·5 sec
Toward I 35E North, I 35E South: Denton, WacoUse the straight / slight right lanes.
22
Keep slight left at fork
0.4 mi·30 sec
Toward I 35E South: WacoUse the left / right lanes.
23
Continue on I 35E
0.5 mi·44 sec·South R L Thornton Freeway
24
Continue on I 35E
89 mi·1 hr 31 min·South R L Thornton Freeway
Exit 426Toward Dallas ZooUse the straight / slight right lanes.
25
Continue on I 35; US 77
6.6 mi·7 min·North Jack Kultgen Expressway
Use the straight / slight right lanes.
26
Continue on I 35
38 mi·39 min·Purple Heart Trail
Use the straight / slight right lanes.
27
Keep slight left at fork onto I 35
56 mi·58 min·I 35
Use the straight / slight right lanes.
28
Keep slight left at fork onto I 35; US 290
50 mi·54 min·Purple Heart Trail
Toward 32nd Street, Dean Keeton StreetUse the slight left lane.
29
Continue on I 35
1.7 mi·1 min·Interstate Highway 35
Use the straight / slight right lanes.
30
Continue on I 35
12 mi·12 min·Purple Heart Trail
Use the straight / slight right lanes.
31
Continue on I 35
10.0 mi·11 min·North Pan Am Expressway
Use the straight / slight right lanes.
32
Keep slight left at fork onto I 35
6.4 mi·8 min·North Pan Am Expressway
Toward I 35 SouthUse the straight / slight right lanes.
33
Keep slight left at fork onto I 35
0.6 mi·41 sec·North Pan Am Expressway
Toward I 35 South: Lower Level, LaredoUse the slight left lane.
34
Take the exit
0.1 mi·16 sec
Exit 157AToward Lexington Avenue, Main Avenue, San Pedro AvenueUse the slight right lane.
35
Turn straight onto East Elmira Street
526 ft·17 sec·East Elmira Street
Use the left / straight lanes.
36
Turn left onto North Main Avenue
0.2 mi·18 sec·North Main Avenue
Use the left / straight lanes.
37
Enter roundabout onto Navarro Street
159 ft·3 sec·Navarro Street
38
Continue on Navarro Street
111 ft·2 sec·Navarro Street
39
Keep slight right at fork onto North Main Avenue
0.4 mi·51 sec·North Main Avenue
Use the slight left / slight right lanes.
40
Turn right onto West Travis Street
222 ft·10 sec·West Travis Street
41
Turn left onto North Flores Street
0.2 mi·20 sec·North Flores Street
42
Continue on Military Plaza
392 ft·15 sec·Military Plaza
43
Turn left onto Dolorosa Street
327 ft·8 sec·Dolorosa Street
44
Arrive at destination
Dolorosa Street
Trip Plan
Given the turn-heavy nature of this 390.6-mile route, departing early in the morning is your best strategy to avoid fatigue and ensure you reach San Antonio before dark. Since you are navigating local roads, keep a close eye on your fuel gauge; even though you have a $58 budget, local stops can be less frequent than on major highways. Flexibility is a major advantage on this trip, so don't hesitate to pull over for a quick stretch whenever the winding road feels repetitive. Pay close attention to your navigation system, as the absence of major highways means you will be making frequent turns throughout the entire journey.
Morning Departure
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Evening Departure
This is a long drive — plan for a morning departure or consider splitting it into two days.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 184.8 miles from Forest Hill, TX, or about 3h 24m into the drive.
The longest continuous stretch on this route runs about 99.6 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 81 miles or 1h 34m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 184.8 miles or 3h 24m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 5h 36m
Traffic, exits, and arrival timing usually matter more near San Antonio, TX than in the middle of the route.
Before You Leave
+
Open the route before leaving Forest Hill, TX so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Forest Hill, TX
This is one driving day of about 369.7 miles and 6h 45m.
Your first comfortable stop window is around 81 miles from Forest Hill, TX.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on Purple Heart Trail for about 99.6 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 30
5 decision points cluster between mile 59.6 and 368 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
8
59.6 mi into trip|~1h 11m in
Keep slight left at fork toward US 75 South, TX 121 South
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward US 75 South, TX 121 South
8
95.4 mi into trip|~1h 50m in
Take the exit toward Downtown, Good-Latimer Expressway
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Exit 284C
Toward Downtown, Good-Latimer Expressway
9
97.5 mi into trip|~1h 54m in
Keep slight left at fork toward I 35E North, I 35E South: Denton, Waco
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Toward I 35E North, I 35E South: Denton, Waco
8
288.1 mi into trip|~5h 13m in|I 35; US 290 / Purple Heart Trail
Keep slight left at fork onto I 35; US 290 / Purple Heart Trail toward 32nd Street, Dean Keeton Street
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward 32nd Street, Dean Keeton Street
8
368 mi into trip|~6h 42m in|I 35 / North Pan Am Expressway
Keep slight left at fork onto I 35 / North Pan Am Expressway toward I 35 South: Lower Level, Laredo
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight left lane.
Toward I 35 South: Lower Level, Laredo
Fuel & Cost
Regular Gas
$55.86 one way
$111.73 round trip
$3.84/gal25.4 MPG avg129 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$4.20
$61.15
$122.29
premium
$4.54
$66.01
$132.01
diesel
$5.61
$81.63
$163.25
Estimated Tolls: $2.86
Central Expressway
(35.7 mi)$2.86
Toll estimates based on average 2024-2025 rates. EZ-Pass/SunPass discounts may lower the actual cost.
Estimated Trip Cost (one way, 1 person)
Fuel
$56
Tolls
$3
Meals
$25–$50
Total
$84–$109
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 129.4 kg one way.
Prices: EIA weekly data, 2026-04-13.
Driving Electric?
About $39 in charging
· 1 stop
· 67% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
110.9
1
$38.82
$17.75
Efficient EV
92.4
1
$32.35
$14.79
EV Truck/SUV
147.9
1
$51.76
$23.66
Gas CO2
129 kg
EV CO2
43 kg (67% less)
Plan for 1 charging stop. A 30-minute DC fast charge mid-route should be enough to complete the trip comfortably.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Apr 18, 2026
Origin
Forest Hill, TX
Late night
in Forest Hill on Tuesday
Local time
5:50 AM
CDT
Current temp
81°F
Unavailable
Live forecast
Destination
San Antonio, TX
Late night
in San Antonio on Tuesday
Local time
5:50 AM
CDT
Current temp
67°F
Mostly Cloudy
SSE 5 to 10 mph1% chanceLive forecast
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
14 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
6h 45m on the road
Start early — leave by 6-7 AM to arrive at a reasonable hour.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Waco Mammoth National Monument
National Monument
Standing as tall as 14 feet and weighing 20,000 pounds, Columbian mammoths roamed across what is present-day Texas thousands of years ago. Today, the fossil specimens represent the nation's first and...
5 mi from route
~13 min detour
Free
near mile 191.2
Welcome to San Antonio Missions, a National Park Service site and the only UNESCO World Heritage Site in Texas. Each mission in the park is a center of community and has been since the early 1700s. Th...
9 mi from route
~22 min detour
Free
near mile 369.7
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
Expect a turn-heavy experience on this drive, as the route avoids high-speed interstates in favor of local roads. With a 0% highway share, you will be navigating constant changes in direction rather than settling into a monotonous interstate grind. This profile requires your full attention, as the lack of long, straight stretches keeps the steering wheel active for the duration of the 6-hour and 10-minute trip. You won't find any singular, exceptionally long uninterrupted stretches here, meaning the road keeps you engaged with its winding local path from start to finish.
68% highway — fuel and pacing are the main things to plan.
44 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 99.6 mi on Purple Heart Trail.
How Hard Is This Drive?
8/10
This is a straightforward highway drive that stays mostly on Purple Heart Trail and South R L Thornton Freeway. This route has several spots where lane changes, forks, or exits need your full attention. The trickiest moment comes around 59.6 miles in.
Driving Effort8/10
Demanding - plan breaks and stay ahead of the key maneuvers
Balances navigation complexity with total wheel time.
This is a demanding drive. With 30 significant decision points across 369.7 miles, you will need to stay alert - especially through interchange areas and urban stretches. Consider splitting it into segments if you are not comfortable with fast highway navigation.
Where does it get tricky?
The main spots that need attention: at 59.6 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 95.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 97.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Elevation Profile
Gently rolling terrain
857 ft499 ft
Total Climb
1,320 ft
Total Descent
1,249 ft
Highest Point
857 ft
~354.3 mi in
Elevation Range
358 ft
Towns Mentioned on Route Signs
Based on OSRM destination-sign hints, not a full list of every settlement the road passes.
Between Forest Hill, TX and San Antonio, TX, road signs point toward Trenton, Downtown, Denton, Waco and Dallas Zoo.
San Antonio is the second largest city in the state of Texas and the 7th largest in the United States. It's the 24th largest metropolitan area in the country. Visited by more than 31 million annual visitors, San Antonio is a beautiful city at the axis of three different geological terrains: Hill Country, South Texas Plains and Prairie and Lakes. There's a lot to do in this city: fine art museums, historical missions and plenty of amusement parks in addition to great dining and lots of drinking. The culture and people are vibrant and interesting. San Antonio's downtown is one of the most lively in the nation.
Top landmarks
•Alamo Mission in San Antonio — historic place in San Antonio, Bexar County, Texas
•San Antonio Missions National Historical Park — historic district in San Antonio, Bexar County, Texas
•Fort Sam Houston — military base in San Antonio, Texas
Doable as a same-day drive at 6h 45m. Total distance: 369.7 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
6h 45m drive, plan rest stops for pacing.
Frequently Asked Questions
The longest stretch is about 99.6 miles on Purple Heart Trail. The full list of main roads is in the Roads section above.
Expect about $2.86 in tolls one way, starting with Central Expressway. Most Northeast and Midwest toll agencies accept E-ZPass; in the West and Texas, transponders like TxTag or FasTrak apply. If you do not have a transponder, cashless tolling plates will mail a bill to the vehicle's registered address — usually with a surcharge, so a rental-car toll pass is often cheaper than paying by mail.
We did not find dedicated rest areas on this route. For a drive this long, plan bathroom and stretch breaks around gas stations, fast-food stops, or small-town downtowns — check the Nearby Places section for options.
It helps. This route has a higher-than-average number of complex decision points, which get harder in the dark. If the last hour of the trip is on surface roads or mountain grades, aim to arrive at San Antonio, TX before sunset when you can. Check the Trip Plan for departure windows that land you in daylight.
Only with planning. This is a long drive for kids — consider splitting it into two days rather than pushing through. Plan at least 1 meaningful breaks. Dedicated rest areas are limited, so plan gas or food stops as your bathroom breaks.
The main spots that need attention: at 59.6 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one; at 95.4 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 97.5 miles: Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one.
Yes — Waco Mammoth National Monument and San Antonio Missions National Historical Park. See the National Parks section for detour distances and tips on detours.
Not recommended in a single day. At 6.8 hours each way, a round trip means 13.5 hours of driving — that is an unsafe level of fatigue for most drivers. Plan at least one night at San Antonio, TX before the return drive.
