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Return Flights from Boston to San Francisco
BOS ⇄ SFO
Boston to San Francisco return, a route covering 4,334 km each way with a typical flight time of 5h 50m. San Francisco is located in United States, in Americas. Fares and availability change constantly; the figures below reflect what's actually on file for this route today, not an estimate.
Return vs. two one-way tickets
Based on real fares on file: a return ticket is €318, versus €348 for two separate one-way tickets at €174 each. The return ticket currently works out cheaper.
Real fares right now
Real one-way fares on file for the outbound leg — useful for picking the cheapest day to fly, even when booking return. The lowest fare on file is €174 on Wed Aug 5.
Cheapest day for the outbound leg
Weather in San Francisco by season
Based on the last 3 years of real historical data.
Nearby airports
- Laurence G Hanscom Field (BED)26 km
- Manchester Boston Regional Airport (MHT)72 km
- Worcester Regional Airport (ORH)72 km
- San Carlos Airport (SQL)16 km
- Metropolitan Oakland International Airport (OAK)18 km
- Norman Y. Mineta San Jose International Airport (SJC)49 km
Money-saving tips
- Book 4–8 weeks ahead of departure where possible — a general industry pattern, not specific to this route.
- Tuesday and Wednesday departures tend to be cheaper than weekend flights on most routes.
- Morning flights are often less expensive than midday or evening departures.
- Compare nearby departure and arrival airports — see the alternatives above.
- Flexible return dates widen your options considerably versus a fixed round-trip window.
Fare types explained
Most airlines sell several fare tiers on the same flight: Economy (the base fare, often with paid extras like seat selection and baggage), Premium Economy (more legroom, sometimes included baggage), Business (priority boarding, lounge access, flat or angled seating on longer routes), and First Class (offered by a shrinking number of airlines on select long-haul routes). Exact inclusions vary by airline and route — check the fare rules shown at booking.
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