San Francisco International (SFO) to Logan International (BOS).
| Departure | Return | Price |
|---|---|---|
| 06/02/2026 | 06/10/2026 | $254 |
| 07/14/2026 | 07/22/2026 | $254 |
| 06/03/2026 | 06/10/2026 | $264 |
| 07/15/2026 | 07/22/2026 | $264 |
| 06/01/2026 | 06/10/2026 | $269 |
| 06/04/2026 | 06/10/2026 | $269 |
| 06/05/2026 | 06/10/2026 | $269 |
| 07/13/2026 | 07/22/2026 | $269 |
| 07/17/2026 | 07/22/2026 | $269 |
| 05/30/2026 | 06/06/2026 | $274 |
Based on current fares, August is the cheapest month to fly from San Francisco to Boston, with average fares around $282 round trip (as low as $274).
See the full month-by-month and day-of-week price analysis
Best Time to Fly SFO → BOSDeparture date prices (economy, round trip). Green = cheap, red = expensive.
The cheapest month to fly from San Francisco to Boston is August, with average round-trip fares around $282. Fares in August start as low as $274. The most expensive month is June, averaging $332.
A nonstop flight from San Francisco to Boston takes approximately 5h 30m.
The cheapest flight from San Francisco to Boston currently starts at $254 round trip in economy class.
The average round-trip flight price from San Francisco to Boston is $338 in economy class.
The distance is 2704 miles (4351 km). with a nonstop flight time of about 5h 30m. The lowest fare currently available is $254 departing in June. The average round-trip fare is $338.
Set up a guest alert and we'll keep checking prices for you. No account needed.
Get Started Free →