Key West, FL → San Antonio, TX

Your journey from Key West to San Antonio spans roughly 1,406 miles and demands close to 23 hours and 34 minutes of driving time, making it an ambitious cross-country adventure that rewards careful planning. You'll begin by leaving the Florida Keys on the iconic Overseas Highway, a remarkable feat of engineering that connects a string of islands via U.S. Route 1 before you transition onto the mainland near Florida City. From there, you'll pick up Florida's Turnpike northward, then merge onto Interstate 75 heading northwest through the heart of Florida's peninsula. The route eventually carries you into Georgia and Alabama via I-75, before you'll junction onto Interstate 10 heading westbound—the major thoroughfare that will become your companion for the remainder of this transcontinental drive.

As you progress westward on I-10, you'll witness a dramatic transformation in landscape and terrain. The flat, subtropical wetlands and palmettos of Florida gradually give way to the rolling hills and pine forests of the Deep South, then transition into the increasingly arid terrain of Louisiana and Texas. You'll pass through or near several significant cities including Tallahassee, Jacksonville, Mobile, New Orleans, and Houston—each offering opportunities to stretch your legs and refuel. The elevation remains relatively modest throughout most of this route, with only modest rises as you approach the Texas Hill Country in the final stretch toward San Antonio, where the landscape becomes noticeably drier and more rugged.

The drive presents mixed conditions depending on where you stop for breaks. You'll encounter urban congestion around major metropolitan areas like Jacksonville, New Orleans, and Houston, where patience and careful navigation are essential, particularly during rush hours. Between these cities, you'll enjoy lengthy stretches of rural highway where you can maintain steady speeds, though fuel and food options become sparse in certain sections of rural Louisiana and eastern Texas. Late fall and early spring represent the ideal windows for this drive, as summer heat—particularly in Texas and southern Louisiana—can make extended hours behind the wheel exhausting, while winter occasionally brings challenging conditions to northern Florida and southern Georgia.

The 1406-mile drive from Key West, Florida to San Antonio, Texas takes approximately 23h 34m under normal conditions. Weather along this route can vary significantly, especially along coastal regions where fog and marine weather can impact visibility. Route Outlook helps you find the safest time to travel by showing you weather conditions at every point along your route, timed to when you'll actually be there.

Common Weather Hazards on This Route

• Severe thunderstorms and flash flooding (spring and summer)
• Hurricane and tropical storm impacts (June through November)

Seasonal Driving Considerations

Coastal weather on this route can shift quickly. Marine fog is common during morning hours, especially in spring and fall, reducing visibility to near zero. Hurricane season (June through November) can bring extended road closures and dangerous conditions. During fair weather, coastal routes offer scenic driving — but always verify conditions with live traffic cameras before heading out.

Best Time to Drive Key West to San Antonio

For long drives like this 1406-mile journey, planning is essential. Consider breaking the trip into segments if weather looks challenging. The best approach is to check conditions for multiple departure times using Route Outlook's optimizer, which considers weather at each point when you'll actually be there.

Driving Strategy

Covering 1406 miles from Key West to San Antonio is a full-day or multi-day drive that requires advance planning. Break the route into manageable segments, planning fuel and rest stops every 2-3 hours. Weather that looks fine at departure may deteriorate significantly at the midpoint. Consider booking overnight accommodation if the forecast shows deteriorating conditions in the latter half. Route Outlook's segment-level weather data helps you identify exactly where and when conditions will change.

Frequently Asked Questions