Cheap flights from San Jose, California to Seattle from $87 SJC → BFI, SEA

Found recently, and the cheapest we hold

What have prices looked like?

Over 49 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $124 to $237.

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

Could nearby dates be cheaper?

We hold no other 4-night return fares leaving within 3 days of 14 Jan 2027 to compare.

Every date we hold

122 fares on 8 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $135.

Found recently, and the cheapest we hold

What have prices looked like?

Over 48 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $65 to $134.

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

3 fares on 3 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $78.

Return

Fares 30 to 59 days before departure were typically 76% lower than 0 to 6 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (49 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

The cheapest fares were 30 to 59 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (48 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 Jose to Seattle?

The cheapest return found recently is $156 with Southwest Airlines, 14 Jan 2027 to 18 Jan 2027, found 2 days ago. The cheapest return we hold, of any age, is $135 with Alaska Airlines, 12 Dec to 14 Dec, found 7 days ago. The cheapest return fare on each of 8 departure dates is usually $161 to $251.

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

The cheapest one-way found recently is $87 with Alaska Airlines, 14 Jan 2027, found 2 days ago. The cheapest one-way we hold, of any age, is $78 with Alaska Airlines, 9 Dec, found 7 days ago. The cheapest one-way fare on each of 3 departure dates is usually $79 to $83.

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

December 2026 is the cheapest month for a return, from $135, 12 Dec to 14 Dec, found 7 days ago. It is the cheapest month for a one-way too, from $78, 9 Dec, found 7 days ago.

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

In 49 days of prices between 24 Sept and 11 Nov, return fares 30 to 59 days before departure were typically 76% lower than 0 to 6 days before departure. In 48 days of prices between 24 Sept and 11 Nov, one-way fares were cheapest 30 to 59 days before departure.

Is there a direct flight from San Jose to Seattle?

Yes, the cheapest nonstop return found recently is $156 with Southwest Airlines, 14 Jan 2027 to 18 Jan 2027, found 2 days ago. The cheapest nonstop one-way found recently is $87 with Alaska Airlines, 14 Jan 2027, found 2 days ago.

How long is the flight from San Jose to Seattle?

The cheapest nonstop one-way found recently, with Alaska Airlines on 14 Jan 2027, takes 2 h 15 min from Norman Y. Mineta San Jose International Airport (SJC) to Seattle-Tacoma International Airport (SEA).

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

Between 15 Nov and 13 Feb 2027, Alaska Airlines has the cheapest return on 5 of the 8 departure dates we hold, and Southwest Airlines on 3. Between 7 Dec and 14 Jan 2027, Alaska Airlines has the cheapest one-way on all 3 departure dates we hold.