Route guide · 2,700 miles
Cheap Flights from Boston to San Francisco
BOS → SFO · Nonstop 5h 59m · Live round-trip fares
Plenty of travelers price out Boston to San Francisco every day — here's how to beat the average fare. Nonstops run about 5h 59m, and the calendar matters more than the airline. Aim to book 4–8 weeks ahead, stay flexible on the day of the week, and set a free alert so a price drop never slips past you.
Live fares for BOS → SFO are updating. Use the search below for real-time prices.
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Updated daily
Flight time
5h 59m
Nonstop, typical
Distance
2,700 mi
BOS → SFO
Book ahead
4–8 weeks
Best window, typically
Nonstop airlines
3
JetBlue, Frontier Airlines & more
Nonstop flights from Boston to San Francisco
Want to skip the layover? Nonstops from Boston to San Francisco are flown by JetBlue, Frontier Airlines, American Airlines, getting you there in about 5h 59m. For the lowest fares, book around 4–8 weeks before departure — last-minute nonstops on this route rarely come cheap.
Booking insights: Boston → San Francisco
- Distance: 2,700 miles · nonstop flight time: 5h 59m.
- Cheapest upcoming week in the live data starts around Nov 5, with fares from $158.
- Rule of thumb for this route: the sweet spot is usually 4–8 weeks before departure.
- Tuesday and Wednesday departures usually undercut Friday and Sunday fares on routes like this one.
- Set a free Airfare Deal alert instead of checking daily — the best fares can sell out in hours.
Price trend
Cheapest departure weeks ahead
Departing around Nov 5 is currently the cheapest window — about $29 less than the nearest weeks. Based on recent fares found for this route; prices change quickly.
Cheapest month · Boston → San Francisco
November 2026
Every date's recent round-trip fare, at a glance.
Fares from
$158
Cheapest: Tue, Nov 10 — $158 · Priciest: Nov 6 — $160
Get this fare →Recent fares found for specific dates in November 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from Boston to San Francisco: what you need to know
The flight
Boston to San Francisco is a transcontinental trip — 2,700 miles, roughly 5h 59m nonstop. Eastbound flights benefit from tailwinds and run shorter; westbound trips home fight headwinds and take longer, so pad your plans accordingly. Red-eyes are popular eastbound: you trade a short night of sleep for a full first day at your destination.
Airlines on this route
JetBlue, Frontier Airlines and American Airlines fly this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Boston (BOS)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Boston airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in San Francisco (SFO)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The San Francisco airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check San Francisco to Boston fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 2,700 miles, booking 4–8 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 5h 59m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
Boston to San Francisco flight FAQs
How long is the flight from BOS to SFO?
Plan on about 5h 59m in the air for a nonstop from Boston to San Francisco — the route runs roughly 2,700 miles. Connecting flights typically add 2–4 hours.
Are there nonstop flights from Boston to San Francisco?
Yes — look for JetBlue, Frontier Airlines, American Airlines on this route. Nonstop seats are usually priced best 4–8 weeks before departure.
What is the cheapest month to fly from Boston to San Francisco?
Travelers usually find the gentlest prices away from peak periods — think post-holiday January and the early-fall weeks. Midweek dates inside those windows are cheaper still.
How much are last minute flights from BOS to SFO?
Book inside the final week and you'll usually pay a premium on BOS to SFO. Fares booked 4–8 weeks ahead are almost always kinder.
What is a good round-trip deal from Boston to San Francisco?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Boston to San Francisco?
The main carriers on this route are JetBlue, Frontier Airlines, American Airlines. Comparing all of them on the live search below usually surfaces the lowest fare for your dates.
How early should I get to Boston airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from Boston
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