Cheap flights from Seattle to San Diego from $112 BFI, SEA → SAN

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 $126 to $246.

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

Could nearby dates be cheaper?

We hold no other 2-night return fares leaving within 3 days of 20 Dec to compare.

Every date we hold

3 fares on 3 departure dates

Which month looks cheapest?

January 2027 is the cheapest month — from $155.

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 38 days, 24 Sept to 11 Nov, the cheapest one-way we saw each day was $65 to $411.

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 3 Jan 2027 to compare.

Every date we hold

5 fares on 4 departure dates

Which month looks cheapest?

January 2027 is the cheapest month — from $112.

Return

Fares 60 to 89 days before departure were typically 55% 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

Fares 60 to 89 days before departure were typically 85% lower than 0 to 6 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 Diego?

The cheapest return found recently is $227 with Southwest Airlines, 20 Dec to 22 Dec, found 2 days ago. The cheapest return we hold, of any age, is $155 with Southwest Airlines, 13 Jan 2027 to 16 Jan 2027, found 7 days ago. The cheapest return fare on each of 3 departure dates is usually $166 to $202.

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

The cheapest one-way found recently is $112 with Frontier Airlines, 3 Jan 2027, found 2 days ago. The cheapest one-way fare on each of 4 departure dates is usually $128 to $141.

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

January 2027 is the cheapest month for a return, from $155, 13 Jan 2027 to 16 Jan 2027, found 7 days ago. It is the cheapest month for a one-way too, from $112, 3 Jan 2027, found 2 days ago.

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

In 49 days of prices between 24 Sept and 11 Nov, return fares 60 to 89 days before departure were typically 55% lower than 0 to 6 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 85% lower than 0 to 6 days before departure.

Is there a direct flight from Seattle to San Diego?

Yes, the cheapest nonstop return found recently is $177 with Alaska Airlines, 15 Dec to 19 Dec, found 4 days ago.

How long is the flight from Seattle to San Diego?

The cheapest one-way found recently, with Frontier Airlines on 3 Jan 2027, takes 42 h 9 min with 1 stop.

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

Between 15 Dec and 13 Jan 2027, Southwest Airlines has the cheapest return on 2 of the 3 departure dates we hold, and Alaska Airlines on 1. Between 14 Nov and 3 Jan 2027, Frontier Airlines has the cheapest one-way on 3 of the 4 departure dates we hold, and Southwest Airlines on 1.