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Cheap flights from San Francisco to Boston

One-way from $119, found by travellers in the last 7 days. The live price is checked when you book.

Departure
Return
Prices for nearby dates
Fri, Dec 4Any priceSat, Dec 5Any priceSun, Dec 6Any priceMon, Dec 7$119Tue, Dec 8Any priceWed, Dec 9Any priceThu, Dec 10Any priceFri, Dec 11Any price

Cheapest one-way tickets

Recent finds on different dates, for 1 adult. Booking opens on Aviasales, which shows baggage, fare rules and the live price.

Cheapest
$119
Frontier Airlines, flight F9 3382Found 2 days ago, 1 adult
Check live price
4:33pmSan FranciscoMon, Dec 7
Travel time 9h 55m, 2 stopsSFOBOS
5:28amBostonTue, Dec 8
$170
Frontier Airlines, flight F9 4310Found yesterday, 1 adult
Check live price
9:23pmSan FranciscoSat, Dec 19
Travel time 10h 38m, 2 stopsSFOBOS
11:01amBostonSun, Dec 20
$176
Alaska Airlines, flight AS 659Found 2 days ago, 1 adult
Check live price
4:47pmSan FranciscoTue, Nov 3
Travel time 7h 35m, 1 stopSJCBOS
3:22amBostonWed, Nov 4
$176
Alaska Airlines, flight AS 659Found yesterday, 1 adult
Check live price
4:47pmSan FranciscoWed, Nov 4
Travel time 7h 35m, 1 stopSJCBOS
3:22amBostonThu, Nov 5
$181
Alaska Airlines, flight AS 1330Found 6 days ago, 1 adult
Check live price
5:00pmSan FranciscoMon, Nov 2
Travel time 7h 20m, 1 stopSFOBOS
3:20amBostonTue, Nov 3

Round trips

The cheapest return tickets found recently, price for the whole trip.

Plan the rest of the trip

  • Mobile data in United StatesTravel eSIM from $4, installed before you fly.
    Compare plans
  • Getting from the airportTransfers and car hire in Boston, booked ahead at a fixed price.
    See options
  • Things to do in BostonPopular tours from $38 per person.
    See ideas
  • Flight delayed?Delayed or cancelled? See which passenger rights cover this route.
    Check

Price calendar

The lowest one-way fare found for each day over the next 60 days. A dash means no recent fare; you can still pick that day.

October 2026

MoTuWeThFrSaSu1234567891011121314151617181920212223242526–27–28–29$20030$19931–

November 2026

MoTuWeThFrSaSu1–2$1813$1764$1765–6–7–8–9–10–11–12–13–14–15–16–17–18–19–20–21–22–23–24–25–26–27–28–29–30–

December 2026

MoTuWeThFrSaSu1–2–3–4–5–6–7$1198–9–10–11–12–13–14–15–16–17–18–19$17020$21121–22–23–24–25262728293031
$170 or lessGreen: the cheapest fifth of fares on this route. Lowest in these 60 days: Dec 7, $119.

Lowest fares by month

In the fares found this week, December has the lowest: from $119 one-way, against $238 in October. Pick a month to see its cheapest date.

  1. Oct$238
  2. Nov$181
  3. Dec$119
  4. Janno fares yet
  5. Febno fares yet
  6. Marno fares yet
  7. Aprno fares yet
  8. Mayno fares yet
  9. Junno fares yet
  10. Julno fares yet
  11. Aug$209
  12. Sepno fares yet
$0$100$200$300OctNov$119DecJanFebMarAprMayJunJulAugSep
Show as a table
MonthCheapest one-wayDateStops
October$238Thu, Oct 291 stop
November$181Mon, Nov 21 stop
December$119Mon, Dec 72 stops
January 2027—
February 2027—
March 2027—
April 2027—
May 2027—
June 2027—
July 2027—
August 2027$209Mon, Aug 161 stop
September 2027—

Fares and weather by month

The lowest one-way fare found for each month, next to the weather in Boston. Average daily high and low and monthly precipitation.

Oct2026NovDecJan2027FebMarAprMayJunJulAugSep
Lowest fare$238$181$119–––––––$209–
High °C17°11°6°3°4°8°14°19°25°28°27°23°
Low °C9°3°-2°-5°-4°-0°5°10°15°19°18°15°
Precipitation mm102931098682106928399838290

Source: Boston on Wikipedia, CC BY-SA 4.0.

Questions travellers ask

What is the cheapest month to fly from San Francisco to Boston?

In the fares found this week, December has the lowest: from $119 one-way, against $238 in October.

What is the weather in Boston in December?

In December, the cheapest month to fly, the average daily high in Boston is 6 °C and the low -2 °C.

Are there direct flights from San Francisco to Boston?

None of the fares found recently are nonstop. The cheapest options have at least one stop.

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