Alaska Airlines Flights from Boston to San Francisco
expand_more
1 Passenger
expand_moretoday
today
Lowest fares from Boston to San Francisco
location_on
location_on
One-way low-fare flights Boston to San Francisco.*
flight_takeoff
flight_land
$
From | To | Fare Type | Dates | Price | |
|---|---|---|---|---|---|
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Feb 3, 2026 | From $108 Seen: 6 hours ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Jan 20, 2026 | From $108 Seen: 1 hour ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Jan 28, 2026 | From $108 Seen: 1 hour ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Jan 21, 2026 | From $108 Seen: 6 hours ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Jan 27, 2026 | From $108 Seen: 6 hours ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Feb 4, 2026 | From $108 Seen: 6 hours ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Feb 18, 2026 | From $118 Seen: 6 hours ago | |
| Boston (BOS) | San Francisco (SFO) | One-way | Saver | Depart: Feb 19, 2026 | From $118 Seen: 6 hours ago |
*Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.