Cheap flights from Seattle to San Francisco from $112 BFI, SEA → SFO

Found recently, and the cheapest we hold

What have prices looked like?

Over 50 days, 24 Sept to 12 Nov, the cheapest return we saw each day was $91 to $352.

At $1,172, the cheapest return found recently is above that range.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other 6-night return fares leaving within 3 days of 6 Dec to compare.

Every date we hold

7 fares on 5 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $91.

Found recently, and the cheapest we hold

What have prices looked like?

Over 50 days, 24 Sept to 12 Nov, the cheapest one-way we saw each day was $53 to $106.

At $112, the cheapest one-way found recently is above that range.

Those were the prices on those days, not today's.

Could nearby dates be cheaper?

We hold no other one-way fares leaving within 3 days of 17 Nov to compare.

Every date we hold

7 fares on 5 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $79.

Return

Fares 30 to 59 days before departure were typically 61% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 12 Nov (50 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

One-way

Fares 30 to 59 days before departure were typically 49% lower than 0 to 6 days before departure.

From the cheapest one-way each day between 24 Sept and 12 Nov (50 days), grouped by how many days ahead the flight left; one adult in economy.

Each range covers different departure dates, so this compares typical fares, not the same trip priced twice.

Prices reflect recent searches — current fares may differ.

How much is a return flight from Seattle to San Francisco?

The cheapest return found recently is $1,172 with SeaPort Airlines, 6 Dec to 12 Dec, found yesterday. The cheapest return we hold, of any age, is $91 with Alaska Airlines, 6 Dec to 12 Dec, found 3 days ago. The cheapest return fare on each of 5 departure dates is usually $195 to $314.

How much is a one-way flight from Seattle to San Francisco?

The cheapest one-way found recently is $112 with Alaska Airlines, 17 Nov, found yesterday. The cheapest one-way we hold, of any age, is $79 with Alaska Airlines, 9 Dec, found 5 days ago. The cheapest one-way fare on each of 5 departure dates is usually $79 to $177.

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

December 2026 is the cheapest month for a return, from $91, 6 Dec to 12 Dec, found 3 days ago. It is the cheapest month for a one-way too, from $79, 9 Dec, found 5 days ago.

How far ahead should I book a flight from Seattle to San Francisco?

In 50 days of prices between 24 Sept and 12 Nov, return fares 30 to 59 days before departure were typically 61% lower than 0 to 6 days before departure. One-way fares 30 to 59 days before departure were typically 49% lower than 0 to 6 days before departure.

Is there a direct flight from Seattle to San Francisco?

Yes, the cheapest nonstop return found recently is $91 with Alaska Airlines, 6 Dec to 12 Dec, found 3 days ago. The cheapest nonstop one-way found recently is $177 with Alaska Airlines, 7 Apr 2027, found 4 days ago.

How long is the flight from Seattle to San Francisco?

The cheapest nonstop one-way found recently, with Alaska Airlines on 7 Apr 2027, takes 2 h 12 min from Seattle-Tacoma International Airport (SEA) to San Francisco International Airport (SFO).

Which airlines have the cheapest flights from Seattle to San Francisco?

Between 21 Nov and 19 Feb 2027, Frontier Airlines has the cheapest return on 3 of the 5 departure dates we hold, Alaska Airlines on 1 and United Airlines on 1. Between 17 Nov and 7 Apr 2027, Alaska Airlines has the cheapest one-way on 3 of the 5 departure dates we hold, SeaPort Airlines on 1 and Frontier Airlines on 1.