San Francisco International Airport (SFO) Guide

Welcome to San Francisco International Airport

San Francisco International Airport (SFO) is the Bay Area’s primary global gateway, sitting on the edge of the bay in San Mateo County about 13 miles south of downtown San Francisco. It’s a big, ring-shaped airport that’s surprisingly easy to learn once you understand its four-terminal layout and the AirTrain that stitches everything together.

SFO’s story starts in 1927 as Mills Field Municipal Airport—a leased cow pasture with a dirt runway. The City of San Francisco bought more land in 1930, renamed it San Francisco Airport in 1931, and later added “International” after World War II as overseas routes expanded. Milestones include early mail flights that helped shape what became United Airlines, Pan American’s trans-Pacific service in the 1930s, and major terminal growth through the jet age.

Today, SFO stands out for how “Northern California” it feels: you’ll find local food, thoughtful design, and strong connectivity to the city by rail. The airport continues to refresh its terminals—most recently with new and expanded dining in Harvey Milk Terminal 1—so even frequent flyers will notice changes.

Airport at a Glance

• IATA/ICAO: SFO / KSFO
• Location: About 13 miles (21 km) south of downtown San Francisco
• Terminals: 4 terminals (Harvey Milk Terminal 1, Terminal 2, Terminal 3, International Terminal) with 7 concourses and 121 gates
• Major airlines: United (largest presence; Terminal 3 and parts of International), plus a wide mix of domestic and international carriers
• Time zone: Pacific Time (PT)
• Official airport website: Not available

Terminals & Layout

SFO is organized as a loop of terminals around the central roadway, with AirTrain (free, automated) connecting everything landside. In practical terms: you can move between terminals quickly without re-entering traffic, and you can reach BART and the Rental Car Center without walking outside.

The four terminals:

• Harvey Milk Terminal 1 (Terminal 1): Primarily domestic operations. Expect a strong lineup of newer food options—look for the SF Eats Food Hall (opened June 2025) for fast, local-leaning meals.
• Terminal 2: Domestic terminal with a calmer feel than Terminal 3 at peak times. It’s a good fallback if you want a less hectic pre-flight vibe.
• Terminal 3: United’s main domestic base at SFO and typically the busiest domestic terminal. Plan a little extra time here during morning and evening bank departures.
• International Terminal (A and G gates): SFO’s long-haul hub. Many international airlines operate from here, plus some United international services. It’s also where you’ll find the BART station (accessible from other terminals via AirTrain).

Getting between terminals

• AirTrain (free): Best for moving between terminals, to BART, parking, and the Rental Car Center. Trains run frequently throughout the day.
• Walking: Some adjacent terminal transfers can be done on foot, but AirTrain is usually faster and clearer—especially if you’re hauling a carry-on.

Timing tip: If you’re connecting between domestic and international flights, budget 15–30 minutes for terminal-to-terminal movement (more if you must exit and re-clear security).

Getting To & From the Airport

Train/Metro (BART)

BART is the most reliable way to reach downtown San Francisco when traffic is unpredictable. You’ll board at the SFO BART station connected to the International Terminal (use AirTrain from other terminals if needed).

• Route: BART Yellow Line service operates through SFO (service patterns can vary by time of day)
• Downtown travel time: Typically 30–40 minutes to central stations like Powell, Montgomery, or Embarcadero
• Frequency: About every 15–20 minutes
• Cost: Fares vary by destination; expect an airport-to-downtown trip to be in the mid single-digits to low teens (check the fare machine for exact pricing)

Buses

Public buses can be a solid budget option, especially to nearby Bay Area cities, but they’re slower and more sensitive to traffic than BART. Use them when you’re staying on the Peninsula or you’re traveling very light.

• Where to catch: Follow terminal signage for public transit/bus pickup areas
• Cost: Usually cheaper than rail or taxis; exact fare depends on route/operator

Taxis

Taxis are straightforward for door-to-door service. You’ll find taxi stands outside baggage claim/arrivals areas with posted signage.

• Typical fare to downtown: Varies widely with traffic and time of day; plan for higher costs during peak commute hours and late-night surcharges
• Best for: Groups, lots of luggage, or destinations not near BART

Rideshare (Uber/Lyft)

Uber and Lyft operate at SFO with designated pickup zones. Follow in-app instructions and airport signage for rideshare pickup—locations can differ by terminal and time.

• Pro tip: If prices surge, compare with a taxi—at SFO, taxis can be competitive when demand spikes.

Rental cars

SFO’s rental car agencies are accessed via the Rental Car Center. Take AirTrain (free) to the rental car stop and follow signs to your company’s counter.

Parking

SFO offers a mix of short-term parking close to terminals and long-term/economy options farther out (often connected by AirTrain). If you’re picking someone up, short-stay parking is usually easier than circling the arrivals curb.

• Short-term: Best for pickups, drop-offs, and brief trips
• Long-term/economy: Better value for multi-day travel

Traveler Essentials

• WiFi: Free airport WiFi is available throughout terminals. Connect to the SFO network and follow the on-screen prompts. If it feels slow near packed gates, try moving closer to open seating areas.
• Charging: Look for charging points near gate seating clusters and along main concourses. At SFO, the best strategy is to plug in as soon as you find a seat—outlets get scarce at peak hours.
• Luggage storage: Options can change; if you need short-term storage (especially for a city visit on a long layover), ask an information desk about current locations and pricing.
• Currency exchange & ATMs: International Terminal is the most likely place to find currency services. For most travelers, ATMs usually offer better rates than exchange counters.
• Information desks: Look in major arrivals areas and the International Terminal. Staff can help with terminal directions, transit, and accessibility services.
• Lost and found: For items lost in terminals, contact the airport’s lost-and-found service. If you lost something on a plane, contact your airline first; if you lost something at security, contact TSA lost and found.

Dining & Shopping Highlights

SFO is one of the better U.S. airports to eat in, especially if you focus on local concepts rather than default fast food. You’ll find everything from quick bowls and coffee to sit-down meals—plus strong grab-and-go options for early departures.

Where to eat

• Harvey Milk Terminal 1: Don’t miss the SF Eats Food Hall (opened June 2025) for a convenient “choose-your-own” meal stop when you’re short on time.
• International Terminal: Solid range for both full meals and snacks—handy if you’re waiting out a long-haul boarding window.
• Terminal 3: Busy, but you’ll find plenty of food concentrated near main gate clusters—plan to order earlier during peak United departure waves.

Shopping highlights

• Duty free: DFS Duty Free (International Terminal A, after security) is a go-to for liquor, tobacco, cosmetics, fragrances, and designer goods. Hours: Su–Sa 08:00–24:00.
• Souvenirs & local snacks: Look for shops selling Bay Area gifts, chocolates, and California wine items (where permitted).
• Convenience: There are multiple market-style stores for water, chargers, travel-size toiletries, and last-minute essentials—useful for early-morning departures.

Late/early options: Hours vary by terminal and security checkpoint; if you’re flying very early, prioritize grab-and-go spots and markets, which tend to open first.

Lounges & Relaxation

SFO has a mix of airline lounges and independent lounges, including options accessible via memberships and day passes.

Independent lounge

• The Club SFO: Harvey Milk Terminal 1, Concourse B near Gate B4 (airside, after security). Operated by The Club Airport Lounges with access commonly available via Priority Pass and paid entry (subject to capacity).

Quiet time between flights

• Best tactic: Walk one or two gate areas away from the main food courts—seating is often noticeably calmer.
• Hydrate and reset: Refill your bottle after security and find seating near windows for natural light, especially if you’re adjusting to time zones.

Airport hotel

If you need a true break between flights, consider an airport-area hotel (some are very close and geared toward quick overnights). Same-day stays can be a lifesaver for long delays or early departures.

Tips for Different Travelers

Families

• Plan terminal time: Give kids a short walk “mission” (snack + gate check) to burn off energy before boarding.
• In-terminal basics: Family restrooms and nursing-friendly facilities are common in major U.S. airports; ask an information desk for the nearest location in your concourse.
• Strollers: AirTrain is stroller-friendly; keep elevators in mind during busy escalator periods.

Business travelers

• Best move: Use BART when timing matters—rush-hour highway traffic can be the difference between making and missing a meeting.
• Workspace strategy: If you don’t have lounge access, look for seats along walls near power (often less competitive than the center gate seating).

Budget travelers

• Cheapest airport-city link: BART is usually the best balance of cost and speed.
• Save on food: Food halls and markets make it easier to assemble a meal (protein + fruit + drink) without sit-down pricing.
• Free amenities: Use free WiFi and refill your bottle after security instead of buying multiple waters.

Travelers with disabilities

• Accessibility: AirTrain is step-free and elevators are widely available.
• Assistance: Request wheelchair or other assistance through your airline in advance; for day-of help, ask at check-in or an information desk.

Transit and layover passengers

• Short layover: Stay in your concourse and prioritize food near your gate—terminal changes can take longer than you think at peak times.
• Long layover: Consider moving to the International Terminal for more space and amenities, then return to your departure terminal with a comfortable buffer.
• City run: If you have several hours, BART can get you downtown and back without dealing with traffic—just be realistic about security re-entry time.

Insider Tips

• Best terminals for a layover: The International Terminal is often the easiest place to stretch out, browse, and find open seating—especially midday.
• Quiet spots: Walk away from central food areas toward the far ends of concourses; you’ll often find emptier gate seating and better chances at outlets.
• What to eat: In Terminal 1, use SF Eats Food Hall when you want speed without sacrificing local flavor.
• Peak times to avoid: Early mornings and late afternoons/evenings can be the most congested, especially around major United departure banks in Terminal 3.
• Security line strategy: If your terminal has multiple checkpoints, ask staff which is moving faster—at SFO, the “closest” entrance isn’t always the quickest.
• Duty-free timing: If you want duty-free (like DFS in International Terminal A), shop after security and leave time for the walk to your gate—International can be deceptively spread out.
• Connecting to BART: Remember: BART is at the International Terminal. If you land domestically, take AirTrain rather than trying to walk curbside with luggage.