Cheapest€344.11
- Delta Air Lines DA295212:006h 32m18:32Boston BOSSan Francisco SFO
Door to door 9h 42mCO2 660.7 kgChanges 0Fixed, no changes
Boston to San Francisco flight
Flights from Boston to San Francisco start at €426.12 and take 9h 11m at their fastest.
Check dates and fares
Fares and seats move by the day. Price Boston to San Francisco on the date you actually want, rather than on the date this page was built.
The Flights from Boston to San Francisco starts at €426.12 and takes 9h 11m door to door, run by 3 operators over 4,464 km, with around 22 departures a day. Fares bottom out about 45 days before departure.
- 9h 11mDoor to door
- 6h 1mMoving
- €426.12 to €840.30From
- 06:14 to 19:57First and last departure
- 22Per day
- 660.7 kgCO2
First and last are taken from the services we sell on September 29, 2026. The return direction keeps its own timetable and is not these times reversed.
€426.12 to €840.30 for one passenger across the 14 departure dates priced here. The low end is one day, not every day. Worked out from this corridor rather than held for anybody. The operator sets the price on the day.
Fares by date
What this journey usually costs, by departure date. It shows which days run dearer.
Typical fares
- about €840.30Mon14
- about €646.19Tue15
- about €693.39Wed16
- about €695.16Thu17
- about €653.27Fri18
- about €666.25Sat19
- about €605.48Sun20
- about €426.12Mon21
- about €428.48Tue22
- about €437.92Wed23
- about €564.77Thu24
- about €552.38Fri25
- about €523.47Sat26
- about €502.82Sun27
Based on what this route has cost recently. The operator sets the price on the day, and the live fare is confirmed when you book.
The cheapest and the fastest on September 29, 2026
Fastest€459.75
- JetBlue Airways JB208111:386h 1m17:39Boston BOSSan Francisco SFO
Door to door 9h 11mCO2 660.7 kgChanges 0Fixed, no changes
Airlines
| Operator | From | Fastest |
|---|---|---|
 JetBlue Airways | €361.81 | 9h 11m |
 Delta Air Lines | €344.11 | 9h 10m |
| United Airlines | €371.25 | 9h 11m |
The flight gets you into San Francisco. It does not get you a bed, and neither do we.
A room in San Francisco for the night the flight gets in
Sort by distance from San Francisco 4th and King and you can see which places are ten minutes on foot and which are not.
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When to book Boston to San Francisco
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €420.8190 days
- €352.3760 days
- €293.3745 days
- €306.3530 days
- €380.1021 days
- €502.8214 days
- €605.487 days
- €693.393 days
- €840.301 days
- Cheapest lead time
- Fares bottom out around 45 days ahead, at €293.37.
- How much it moves
- The gap between the cheapest and most expensive lead time is 186 percent. The most expensive point is €840.30, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 45 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- €502.82Sun
- €426.12Mon
- €428.48Tue
- €437.92Wed
- €564.77Thu
- €552.38Fri
- €523.47Sat
Where you leave from and where you arrive
Boston
Air
- BOS
- BED
San Francisco
Air
- SFO
What the journey actually looks like
- Direct or connecting
- 82% of the services we sell on this corridor run through without a change. The remaining 18% involve one connection.
- How far it really runs
- The route covers 4,464 km against 4,334 km in a straight line, a detour of 3 percent. Track and road geometry account for the difference.
- Where the change is
- Connections are made at Salt Lake City, Milwaukee, Toronto, Detroit. The gap between arriving and leaving is 78 minutes, of which about 5 is walking.
- If the connection is missed
- The tightest connection we sell here has a 12 percent chance of not being made on the timetable alone. Part of this journey is a self transfer between separate tickets, so leave more time than the minimum and expect to check in again.
- First and last departure
- The first service of the day leaves Boston at 06:14 and the last at 19:57, across 22 departures The return direction keeps its own timetable, so the times back are not these times reversed.
Questions about Boston to San Francisco
The questions people actually ask about this trip, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does the Flight from Boston to San Francisco take?
The Flight from Boston to San Francisco takes 9h 11m door to door, of which 6h 1m is spent moving. The route runs 4,464 km. The difference between the two times is reaching the terminal and leaving it at the far end, which every time on this page includes.
How much does the Flight from Boston to San Francisco cost?
The Flight from Boston to San Francisco starts at €426.12 for one passenger, as of September 13, 2026. A typical fare is €411.37. Both are the total including taxes, supplier fees and our service fee, so the price here is the price at checkout.
Who runs the Flight from Boston to San Francisco?
3 operators run the Flight from Boston to San Francisco: JetBlue Airways, Delta Air Lines, United Airlines. Between them they file around 22 departures a day. The operator table on this page compares them on fare, journey time, cruising speed, fare conditions and what is provided on board.
Which terminal does the Flight from Boston to San Francisco use?
The Flight from Boston to San Francisco leaves from Boston BOS and arrives at San Francisco SFO. Allow about 3h 10m for reaching the departure terminal and leaving the arrival one. That time is already inside every door to door figure quoted on this page.
When should I book the Flight from Boston to San Francisco?
Fares for the Flight from Boston to San Francisco bottom out around 45 days ahead, at €293.37. The gap between the cheapest and most expensive lead time across the window is 186 percent, measured on September 13, 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Flight from Boston to San Francisco produce?
The Flight from Boston to San Francisco produces about 660.7 kg of CO2 per passenger over 4464 km, which works out at roughly 148 grams per passenger kilometer. That figure is for the whole journey and for one traveler, not for the vehicle.
Where these numbers come from
Places, coordinates, operators, which operator serves which pair, and every distance on this page are real and come from open data. Where a corridor has a filed timetable the departure times are real too, and ferry fares are the prices the operators publish themselves.
Observed service A carrier record shows this named operator serving this named pair, and we carry that through unchanged.
Where no operator publishes a fare for a corridor, the price here is our own estimate, worked out from the real distance and the real operator through a fare curve that follows lead time, day of the week and season. It tells you roughly what the journey costs. It is not a seat anyone has agreed to sell, and the payment step will not take it.
Defined in full at Door to door, Fares, The booking window, Carbon
- On this page
- Every figure above was computed for Boston to San Francisco on September 13, 2026: 4464 km of route against 4334 km in a straight line, 22 services a day, 3 operators a cheapest fare of €426.12, and 9h 11m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
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