● Deals from
● Sweeping every destination…
$146usually $173−16%15 Sept 2026 · 1-stop · score 49/100 · Fair
Why so cheap?
This fare is below usual but under our auto-research threshold — ask and we’ll find the reason now, with sources.
Fares by departure date
Today’s fare is cheaper than 96% of the 24 fares tracked for this route.
Questions people ask about this route
- What is the lowest price for a flight from Boston to San Francisco right now?
- The lowest price our scan found today (2026-08-29) is $146 one-way fare, departing 15 Sept 2026, 1-stop. Fares move constantly — the link below re-checks live availability on Aviasales.
- Is $146 a good price for a Boston to San Francisco flight (BOS→SFO)?
- Yes by the data: this route usually costs about $173 (midpoint of Google Flights' typical price range), so $146 is 16% below usual and cheaper than 96% of the 24 fares tracked for this route. FareFloor's deal score for it is 49/100 as of 2026-08-29.
- When is the cheapest time to fly from Boston to San Francisco in the coming months?
- Across the departure windows our 2026-08-29 scan compared, the lowest-priced departure found is 15 Sept 2026 at $146 one-way fare. Method: we sweep this origin's destinations several times a day via Google Flights data and keep the cheapest round-trip window per route — a cheaper window can appear any day, so treat this as today's answer, not a permanent one.
- Is there a direct flight from Boston to San Francisco at this price?
- The cheapest fare found today is 1-stop. A direct option, where one exists, may cost more — check the live fare link for alternatives.