Route guide · 2,700 miles
Cheap Flights from San Francisco to Boston
SFO → BOS · Nonstop 5h 59m · Live round-trip fares
Flying from San Francisco to Boston doesn't have to drain your wallet. This 2,700-mile hop takes about 5h 59m nonstop, and fares swing a lot depending on the week you pick. Travelers who book roughly 4–8 weeks out usually come out ahead — set a free alert and let the deals come to you.
Live fares for SFO → BOS 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
SFO → BOS
Cheapest month
October 2026
Fares from $168
Nonstop airlines
3
JetBlue, Frontier Airlines & more
Nonstop flights from San Francisco to Boston
Want to skip the layover? Nonstops from San Francisco to Boston 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: San Francisco → Boston
- Distance: 2,700 miles · nonstop flight time: 5h 59m.
- Cheapest upcoming week in the live data starts around Oct 15, with fares from $168.
- Of the months we're tracking right now, October 2026 has the lowest fares, starting at $168.
- Rule of thumb for this route: the sweet spot is usually 4–8 weeks before departure.
- Midweek departures (Tue–Thu) are consistently cheaper than weekend flights.
- Set a free Airfare Deal alert instead of checking daily — the best fares can sell out in hours.
Price trend
Cheapest departure weeks ahead
Near-term departures around Oct 15 are currently the cheapest on this route. Based on recent fares found for this route; prices change quickly.
Cheapest month · San Francisco → Boston
October 2026
Every date's recent round-trip fare, at a glance.
Fares from
$168
Cheapest: Tue, Oct 20 — $168 · Priciest: Oct 22 — $231
Get this fare →Recent fares found for specific dates in October 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 San Francisco to Boston: what you need to know
The flight
San Francisco to Boston 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 San Francisco (SFO)
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 San Francisco airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Boston (BOS)
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 Boston airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Boston to San Francisco fares — prices on the return direction often move on a different rhythm.
When to book
Of the months we're currently tracking, October 2026 is coming in cheapest for this route, with fares from $168. As a rule, booking 4–8 weeks ahead lands you in the sweet spot — leave it to the final two weeks and prices usually climb. If you see a fare that works, don't wait around: set a fare alert on this page and we'll watch the price for you.
Good to know before you go
- Basic economy fares often exclude checked bags and seat selection. Price the whole trip, not the headline fare.
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
- 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.
San Francisco to Boston flight FAQs
How long is the flight from SFO to BOS?
Nonstop flights from San Francisco to Boston take about 5h 59m and cover roughly 2,700 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from San Francisco to Boston?
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 San Francisco to Boston?
Of the months we're tracking right now, October 2026 has the lowest fares from San Francisco to Boston, starting at $168. Fares update as new data comes in, so it's worth setting a free alert for your dates.
How much are last minute flights from SFO to BOS?
Book inside the final week and you'll usually pay a premium on SFO to BOS. Fares booked 4–8 weeks ahead are almost always kinder.
What is a good round-trip deal from San Francisco to Boston?
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 San Francisco to Boston?
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 San Francisco 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 San Francisco
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