Cheap flights from San Francisco to Seattle from $103 SFO → SEA

Found recently, and the cheapest we hold

It is also the cheapest return we hold, of any age.

What have prices looked like?

Over 46 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $124 to $293.

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

Could nearby dates be cheaper?

We hold no other 9-night return fares leaving within 3 days of 15 Dec to compare.

Every date we hold

13 fares on 9 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $134.

Found recently, and the cheapest we hold

It is also the cheapest one-way we hold, of any age.

What have prices looked like?

Over 47 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $66 to $173.

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 14 Jan 2027 to compare.

Every date we hold

1 fares on 1 departure dates

Return

Fares 30 to 59 days before departure were typically 54% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (46 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 14% lower than 14 to 29 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (47 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 San Francisco to Seattle?

The cheapest return found recently is $134 with Alaska Airlines, 15 Dec to 24 Dec, found 2 days ago. The cheapest return fare on each of 9 departure dates is usually $161 to $288.

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

The cheapest one-way found recently is $103 with Frontier Airlines, 14 Jan 2027, found 2 days ago.

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

December 2026 is the cheapest month for a return, from $134, 15 Dec to 24 Dec, found 2 days ago.

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

In 46 days of prices between 24 Sept and 11 Nov, return fares 30 to 59 days before departure were typically 54% lower than 0 to 6 days before departure. In 47 days of prices between 24 Sept and 11 Nov, one-way fares 30 to 59 days before departure were typically 14% lower than 14 to 29 days before departure.

Is there a direct flight from San Francisco to Seattle?

Yes, the cheapest nonstop return found recently is $134 with Alaska Airlines, 15 Dec to 24 Dec, found 2 days ago.

How long is the flight from San Francisco to Seattle?

The cheapest one-way found recently, with Frontier Airlines on 14 Jan 2027, takes 10 h 7 min with 1 stop.

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

Between 15 Nov and 13 Feb 2027, Alaska Airlines has the cheapest return on 5 of the 9 departure dates we hold, Frontier Airlines on 3 and United Airlines on 1.