Is there a train to San Antonio?

Yes, Amtrak's Texas Eagle serves San Antonio, but it requires a connection in Chicago or Los Angeles from Colorado.

How long is the drive?

The drive takes approximately 16 hours of active driving time.

Are there direct flights?

No, there are no direct flights from Fort Collins; you must depart from Denver International Airport.

What is the best route?

Taking I-25 South to I-35 South is the most direct and common route.

Like any major city, stick to well-lit tourist areas like the River Walk at night.

Fort Collins

San Antonio

Flight Driving

Fort Collins to San Antonio

Updated: 28 May 2026

The journey from Fort Collins to San Antonio covers approximately 1,050 miles. Most travelers drive south via I-25 to I-35, a route taking roughly 16 hours of pure driving time. Alternatively, you can drive to Denver International Airport and take a direct flight to San Antonio International Airport. This trip transitions from the Rocky Mountain foothills to the humid subtropical climate of South Texas. Expect significant traffic congestion when passing through the Dallas-Fort Worth metroplex on I-35.

Total Distance: 1,690 km driving distance; 1,350 km air distance.

Fastest Way

Flight from Denver International Airport takes 5 hours including layovers.

Cheapest Way

Driving is the cheapest for groups of two or more, costing roughly $200 in fuel.

Compare Fort Collins to San Antonio Routes

	Flight Connecting	Driving Direct
Duration	5 hours	16 hours
Avg Price	$150-$400	$180-$250 in fuel
Operator	United Airlines	Personal Vehicle
Route	Denver International Airport (DEN) to San Antonio International (SAT).	I-25 South to I-35 South via Denver, Amarillo, and Dallas.
Tip	Book your flight at least 21 days in advance to secure lower fares.	Avoid driving through downtown Dallas during rush hours between 7 AM and 9 AM.

Travel Tips

Airport Parking
Use the Pikes Peak shuttle lot at Denver International Airport for cheaper long-term parking.
Hydration
Carry extra water when driving through the high plains of New Mexico and Texas.
Toll Roads
Be prepared for toll roads in the Dallas-Fort Worth area; use a toll tag for easier passage.
Time Zone
Both cities are in the Central Time Zone, so you will not need to adjust your watch.
Vehicle Check
Check your tire pressure before leaving, as the temperature change between Colorado and Texas can affect it.

Safety Tips

Fatigue Management
Stop every 3 hours to stretch; the long stretches of I-35 can induce highway hypnosis.
Weather Awareness
Check for severe thunderstorms in the Texas Panhandle during spring months.
Emergency Kit
Keep a roadside emergency kit with jumper cables and a flashlight in your trunk.
Fuel Stops
Do not let your gas tank drop below a quarter tank in rural West Texas.