ID Requirements
US domestic flights require a valid government-issued photo ID. From May 7, 2025, the TSA requires a REAL ID-compliant driver's license or state ID, or a US passport, for domestic flights. International visitors should use their passport. Check the TSA website for the most current requirements.
Security
TSA (Transportation Security Administration) security checkpoints are at all US airports. Remove shoes, belts, and jackets. Laptops and liquids (in a quart-sized bag, 3.4oz/100ml or less per container) must be removed from bags. TSA PreCheck ($85 for 5 years) provides expedited screening at most US airports and is worth considering for frequent travelers.
Baggage
Most US domestic airlines charge for checked bags (typically $30–40 per bag each way). Carry-on bags are generally free but must fit in the overhead bin. Budget carriers (Spirit, Frontier, Allegiant) may charge for carry-on bags as well. Check your airline's specific baggage policy before flying.
Booking Tips
Book domestic flights 3–6 weeks in advance for the best fares. Tuesday and Wednesday departures are often cheaper than weekend flights. Use fare comparison sites (Google Flights, Kayak, Skyscanner) to compare prices across airlines. Consider nearby airports — flying into a secondary airport can save money.
Airline Loyalty Programs
Joining a US airline loyalty program is free and can earn you free flights, upgrades, and priority boarding. The major programs are American AAdvantage, Delta SkyMiles, United MileagePlus, and Southwest Rapid Rewards. Even occasional travelers benefit from earning miles.
Key Tips
Arrive at the airport at least 90 minutes before domestic departures, and 2.5–3 hours before international departures.
TSA PreCheck ($85 for 5 years) is worth the investment for frequent US domestic travelers.
Most US airlines allow one free personal item (smaller than a carry-on) in addition to a carry-on bag.
Download your airline's app for mobile boarding passes, real-time flight updates, and easy rebooking if your flight is delayed.