Cheap Flights from San Francisco to London — $349

San Francisco International Airport (SFO) is the region’s primary international gateway and a major hub for legacy carriers, though low-cost airlines also operate many routes. It’s located about 13 miles (20 km) south of downtown San Francisco, with BART providing a direct link to the city center in roughly 30–40 minutes for fares typically in the lower double digits; taxis and rideshares can take 25–45 minutes depending on traffic and cost more. The airport has a broad range of lounges and dining options, making connections comfortable, but peak-hour traffic and security lines can be lengthy. For nearby domestic-leaning travel, Oakland and San Jose airports are alternatives with different price and convenience trade-offs.

London is served by a network of airports with different roles and price profiles. Heathrow is the city’s main international hub, typically handling long-haul and premium carriers as well as major alliances; it’s usually perceived as higher-end but can offer competitive fares on many routes. It sits about 15–25 km west of central London; the Heathrow Express reaches Paddington in around 15–20 minutes (farey range depends on advance purchase), while the Piccadilly Line tube takes roughly 45–60 minutes for lower-cost transfers. Pros: frequent long-haul connections and extensive facilities; cons: can be busy and transfer times vary. Gatwick functions as a large international and leisure gateway, often used by a mix of full-service and low-cost carriers; fares can be competitive, especially for holiday routes. Located about 45–60 km south of central London, the Gatwick Express or Thameslink trains typically reach Victoria or central stations in 30–45 minutes, with slower but cheaper bus and coach options taking longer. Pros: good long-haul and European links with a straightforward layout; cons: it’s further out than Heathrow for many central locations and can be congested at peak seasons. Stansted is generally positioned as the primary base for low-cost and European short-haul carriers, so it can be a budget-friendly option for many travelers. It sits roughly 48–65 km northeast of central London; Stansted Express trains take about 45–50 minutes to Liverpool Street, while coaches and local buses offer cheaper but slower journeys. Pros: extensive low-cost connectivity and simple arrivals; cons: less convenient for central London due to distance and fewer premium services. Luton is typically used by low-cost airlines and charter operators, making it a common choice for price-conscious travelers. It’s around 40–55 km northwest of central London; dedicated trains to St Pancras take roughly 25–35 minutes from nearby Luton Airport Parkway plus a short shuttle, and coach services provide direct but slower connections. Pros: often affordable fares and straightforward facilities; cons: shuttle transfers and road congestion can add time. London City Airport serves a niche role as a convenient business-focused hub for short-haul and regional routes, often attracting business travelers and carriers offering quick connections. Located very close to the financial districts (about 10 km east of central London), the DLR links to Canary Wharf and the Tube in roughly 20–30 minutes; taxis and river services can be handy but pricier. Pros: fastest access to East London and compact terminals; cons: limited long-haul options and stricter aircraft size/weight restrictions. Southend is a smaller, budget-oriented option that can be used for regional and European leisure flights; it’s sometimes chosen for lower fares or less-crowded terminals. Positioned about 60–75 km east of central London, train connections to Liverpool Street take around 45–60 minutes, while coaches can be cheaper but slower. Pros: calmer terminals and straightforward processes; cons: longer travel time to central London and fewer flight choices.

In different months, ticket prices from San Francisco to London vary: minimum — $296 (September 2026), maximum — $423 (June 2026). Typically, the flight costs $349–$749.

The route San Francisco — London is served by many carriers — 6 in total, including Virgin Atlantic, British Airways, United Airlines, Frontier Airlines, American Airlines, and JetBlue Airways. This gives passengers wide opportunities: from finding the lowest fare (from $349) to selecting flights by schedule or service class. Our service aggregates data from multiple booking systems so you can compare offers in one place. This saves time and money: no need to check dozens of sites — just pick the right option and book online.