Boston (BOS) → San Francisco (SFO)

Boston Logan International Airport to San Francisco International Airport · 2,344 nm (4,341 km) · about 5.5 h nonstop

Cheapest economy fares, checked daily · 43 days of history

Written and maintained by Jake McEwen

Booking links are plain searches — none are affiliate links, and the site earns nothing if you book. Prices are the cheapest fares other travellers recently found, not live availability — always confirm the fare before you pay.

Economy

last checked 6h ago

$145one-way

Southwest Airlines · 1 stop · 12h 50m · travel Nov 10 · sold via Farera

Book on Aviasales· $145 ↗Compare on Google Flights ↗Compare on Skyscanner ↗

Lowest (90d)

$102

Typical (median)

$144

Highest (90d)

$158

Checks

Cheapest fare seen at each daily check over the last 90 days. Green dots are checks that qualified as a deal.

When it's cheapest to travel

Travel dates of the cheapest fare found at each of our 53 daily checks — where the low fares were, not every date.

Lowest fare by travel month

Oct 2026	$144	1×
Nov 2026	$102	52×

Typical fare by day of travel

Thucheapest	$115	3×
Tue	$144	48×
Mon	$147	2×

Checked	Fare	Airline	Stops	Travel	Sold via
2026-10-24	$145	Southwest Airlines	1 stop	Nov 10	Farera	Book ↗
2026-10-24	$145	Southwest Airlines	1 stop	Nov 10	Farera	Book ↗
2026-10-23	$113	Alaska Airlines	1 stop	Nov 10	Kupi.com	Book ↗
2026-10-22	$113	Alaska Airlines	1 stop	Nov 10	Kupi.com	Book ↗
2026-10-22	$113	Alaska Airlines	1 stop	Nov 10	Kupi.com	Book ↗
2026-10-21	$147	JetBlue Airways	1 stop	Nov 9	Clickavia	Book ↗
2026-10-20	$147	JetBlue Airways	1 stop	Nov 9	Clickavia	Book ↗
2026-10-19	$158	Alaska Airlines	1 stop	Nov 10	Trip.com	Book ↗
2026-10-19	$158	Alaska Airlines	1 stop	Nov 10	—	Book ↗
2026-10-18	$158	Alaska Airlines	1 stop	Nov 10	—	Book ↗
2026-10-18	$158	Alaska Airlines	1 stop	Nov 10	—	Book ↗
2026-10-17	$158	Alaska Airlines	1 stop	Nov 10	—	Book ↗

Airlines selling the cheapest fares

Which carrier had the lowest fare on each of our checks over the last 90 days.

Alaska Airlines ×39
Southwest Airlines ×11
JetBlue Airways ×3

About this route

Boston (BOS) to San Francisco (SFO) is one of the busiest air routes in its market (US domestic). It links Boston Logan International Airport in United States with San Francisco International Airport in United States. The great-circle distance is about 2,344 nautical miles (2,698 statute miles), so expect roughly 5.5 hours in the air nonstop.

Every night we ask our fare provider for the cheapest one-way economy fare other travellers recently found on this route and record it, with the airline and the seller it was found with. A fare is flagged as a deal when it falls at least 30% below the route's 90-day typical price. Prices are a research starting point, not live availability — the booking links open the itinerary so you can confirm what's on sale right now.

Fares are approximate, from public sources, and can be stale — always verify before booking.