Carry-On Only for Houston: IAH, HOU, United Hub & Packing Tips

Houston is the United States' fourth-largest city and one of its most underappreciated. The energy capital of the world is also a city of extraordinary cultural and culinary diversity — the most ethnically diverse major US city, with Vietnamese crawfish shacks alongside Nigerian restaurants, superb Tex-Mex, and an Indian corridor that rivals anything in the country. It is home to NASA's Johnson Space Center, a genuine Museum District with 19 institutions, and Buffalo Bayou Park winding through the urban core. Flying into Houston means choosing between two airports with very different airline profiles.

Two Airports: IAH and HOU

George Bush Intercontinental Airport (IAH) is United Airlines' global hub and one of the ten busiest airports in the United States. IAH sits approximately 35 kilometers north of downtown Houston, and reaching downtown by car takes 35 to 45 minutes in normal traffic, though Houston traffic can extend this significantly. There is no rail link to downtown from IAH — a shuttle, rental car, or ride-share is the only option.

IAH has five terminals (A through E) connected by an underground train. United operates primarily from Terminals B, C, and E. If you have a connection at IAH, leave more time than you think you need — the walk between terminal extremes is long, and the inter-terminal train runs frequently but the distances are substantial.

William P. Hobby Airport (HOU) is Southwest Airlines' primary Houston hub. Hobby sits approximately 20 kilometers south of downtown and is significantly smaller and easier to navigate than IAH. The transfer to downtown takes 20 to 30 minutes by car. No rail link exists here either.

Hobby handles Southwest's extensive domestic Southwest network from Houston, plus some other carriers including Delta and others on limited routes. If you fly Southwest, HOU is your airport.

Carry-On Policies at Houston Airports

United Airlines (IAH hub): Standard United economy fares include a carry-on plus personal item. United Basic Economy excludes overhead bin access. MileagePlus Premier status and the United Explorer credit card both confer overhead access on Basic Economy fares — worth knowing if you carry either.

Southwest Airlines (HOU hub): One free carry-on plus one personal item for every passenger, no restrictions. Southwest is consistently the most carry-on-friendly policy among US carriers.

Spirit and Frontier serve IAH with their standard model of low base fares and separate fees for carry-on bags. As always with these carriers, the effective price including a carry-on often equals a full-service carrier's fare — compare total prices rather than base fares.

American and Delta both operate at IAH with their standard carry-on policies: included for most economy fares, excluded for Basic Economy equivalents.

Packing for Houston in Summer

Packing for Houston summer is essentially an exercise in extreme minimalism and fabric selection. From May through October, temperatures in Houston commonly reach 35 to 38 degrees Celsius, and the humidity is high enough that even moderate temperatures feel stifling. Late summer months bring the additional threat of tropical weather — hurricanes and tropical storms occasionally affect Houston through August and September.

Pack exclusively lightweight, breathable fabrics. Linen shirts and blouses, cotton t-shirts, moisture-wicking athletic wear, and thin shorts or lightweight pants are the right choices. Leave anything heavyweight at home. One outfit per day is the plan; there is no reason to pack extras.

Every building in Houston is heavily air-conditioned. This is not an exaggeration — restaurants, museums, offices, and shopping centers maintain indoor temperatures that can feel cold relative to the extreme outdoor heat. A thin long-sleeve layer — a light cardigan, a lightweight button-up — is genuinely useful for navigating between the outdoors and intensely cooled interiors. Pack one.

Sunscreen is non-negotiable. Houston's sun is intense, and walking from a parking lot to a building or waiting for a car outside can result in a burn quickly in summer.

A rain jacket or compact umbrella earns its place in a Houston summer bag. Afternoon thunderstorms are common from June through September and can be heavy and sudden.

For late summer tropical weather: if your trip falls in August through October, monitor National Hurricane Center forecasts and ensure your travel insurance covers weather delays. Houston occasionally experiences significant flooding from tropical systems.

Packing for Houston in Winter

Houston winters are mild. Temperatures from December through February average between 8 and 16 degrees Celsius, and the city rarely sees freezing temperatures — when it does, the impact is significant because the infrastructure is not designed for it (a major winter storm in February 2021 caused widespread disruption). A light-to-medium jacket, a few layers, and comfortable shoes are sufficient for most Houston winter visits. Heavy winter gear is not needed.

Must-See Houston Attractions

Space Center Houston / Johnson Space Center is the centerpiece attraction and one of the most impressive science museums in the country. The Saturn V rocket pavilion alone justifies the trip. Allow a full day and arrive early — it fills up, particularly on weekends and school holidays. This is about 40 minutes south of downtown; you need a car or Uber.

The Museum District clusters 19 institutions within a walkable area near Hermann Park. The Museum of Fine Arts Houston (free on Thursdays) is one of the US's largest art museums by square footage and collection size. The Natural Science Museum and the Holocaust Museum are also strong.

Buffalo Bayou Park is a well-designed linear park along the bayou through the center of the city, good for walking or cycling. Best in the morning before summer heat intensifies.

The food: Houston's culinary diversity is extraordinary. Bellaire Boulevard (the "Asian Food Corridor") has some of the best Vietnamese food outside Vietnam — Viet-Cajun crawfish in particular is a Houston invention worth seeking out. The Heights neighborhood has excellent independent restaurants. Ninfa's on Navigation is historic Tex-Mex. Hugo's for modern Mexican. Gatlin's for local barbecue.

Getting Around Houston

A car or consistent ride-share use is realistic for most visitors. The METRORail light rail covers the downtown-to-museum-district-to-Texas Medical Center corridor, which is useful for Museum District visits. Everything else requires wheels. Lyft and Uber are widely available throughout Houston. Rental car rates at both IAH and HOU are often competitive.

The Carry-On Only Verdict

Houston is very manageable for carry-on only travel in winter and spring. Summer requires lightweight packing discipline but is entirely doable. The main carry-on consideration is the air conditioning contrast — pack that one thin indoor layer you would not normally need. The city's car-centric nature means you are not carrying your bag on long walks through transit systems, which helps.