Cheap flights from Seattle to San Jose, California from $98 BFI, SEA → SJC

Found recently, and the cheapest we hold

What have prices looked like?

Over 32 days, 24 Sept to 11 Nov, the cheapest return we saw each day was $134 to $502.

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

Could nearby dates be cheaper?

We hold no other 3-night return fares leaving within 3 days of 18 Feb 2027 to compare.

Every date we hold

3 fares on 3 departure dates

Which month looks cheapest?

January 2027 is the cheapest month — from $156.

Found recently, and the cheapest we hold

What have prices looked like?

Over 38 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $67 to $496.

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 18 Jan 2027 to compare.

Every date we hold

5 fares on 4 departure dates

Which month looks cheapest?

December 2026 is the cheapest month — from $80.

Return

The cheapest fares were 14 to 29 days before departure.

From the cheapest return each day between 24 Sept and 11 Nov (32 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 60 to 89 days before departure were typically 40% lower than 14 to 29 days before departure.

From the cheapest one-way each day between 24 Sept and 11 Nov (38 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 Jose?

The cheapest return found recently is $206 with Alaska Airlines, 18 Feb 2027 to 21 Feb 2027, found 5 days ago. The cheapest return we hold, of any age, is $156 with Alaska Airlines, 4 Jan 2027 to 19 Jan 2027, found 6 days ago. The cheapest return fare on each of 3 departure dates is usually $181 to $211.

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

The cheapest one-way found recently is $98 with Southwest Airlines, 18 Jan 2027, found 2 days ago. The cheapest one-way we hold, of any age, is $80 with Southwest Airlines, 26 Dec, found 4 days ago. The cheapest one-way fare on each of 4 departure dates is usually $94 to $215.

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

January 2027 is the cheapest month for a return, from $156, 4 Jan 2027 to 19 Jan 2027, found 6 days ago. December 2026 is the cheapest month for a one-way, from $80, 26 Dec, found 4 days ago.

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

In 32 days of prices between 24 Sept and 11 Nov, return fares were cheapest 14 to 29 days before departure. In 38 days of prices between 24 Sept and 11 Nov, one-way fares 60 to 89 days before departure were typically 40% lower than 14 to 29 days before departure.

Is there a direct flight from Seattle to San Jose?

Yes, the cheapest nonstop return found recently is $206 with Alaska Airlines, 18 Feb 2027 to 21 Feb 2027, found 5 days ago. The cheapest nonstop one-way found recently is $80 with Southwest Airlines, 26 Dec, found 4 days ago.

How long is the flight from Seattle to San Jose?

The cheapest nonstop one-way found recently, with Southwest Airlines on 26 Dec, takes 2 h 15 min from Seattle-Tacoma International Airport (SEA) to Norman Y. Mineta San Jose International Airport (SJC).

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

Between 30 Dec and 18 Feb 2027, Alaska Airlines has the cheapest return on all 3 departure dates we hold. Between 26 Dec and 16 Jun 2027, Southwest Airlines has the cheapest one-way on 2 of the 4 departure dates we hold, SeaPort Airlines on 1 and Alaska Airlines on 1.