Cheap flights from San Diego to Seattle

One-way fares from $65 · SAN → SEA · prices found by travellers in the last 48 hours

Compare all dates Seattle → San Diego
Cheapest fare
$65

Frontier Airlines · Sat, Dec 12

Cheapest month
December

from $65

Direct flights
Yes

Southwest Airlines

Flight time
3h 05m

1,710 km

Get a price alert

We'll email you when San Diego → Seattle drops to your price. It's free, and you can stop any time.

Today's cheapest fare is $65. We'll send one email to confirm. See our privacy policy.

Cheapest month to fly from San Diego to Seattle

Lowest one-way fare per person in each month. Choose a month to see every date.

  1. November 2026 $126
  2. December 2026 Cheapest $65

Cheapest dates in December 2026

The lowest fares we've seen for each day, cheapest first.

Frontier Airlines
Depart06:30 Sat, Dec 12SAN → SEA 5h 47m · 1 stop
$65one way, per person
View deal
Frontier Airlines
Depart06:30 Fri, Dec 4SAN → SEA 5h 42m · 1 stop
$67one way, per person
View deal
Southwest Airlines
Depart17:45 Mon, Dec 14SAN → SEA 3h 10m · Direct
$68one way, per person
View deal
Frontier Airlines
Depart06:30 Wed, Dec 16SAN → SEA 5h 47m · 1 stop
$68one way, per person
View deal
Southwest Airlines
Depart17:55 Fri, Dec 18SAN → SEA 3h 05m · Direct
$68one way, per person
View deal
Southwest Airlines
Depart07:20 Tue, Dec 15SAN → SEA 3h 05m · Direct
$69one way, per person
View deal
Southwest Airlines
Depart09:45 Thu, Dec 17SAN → SEA 3h 15m · Direct
$69one way, per person
View deal
Frontier Airlines
Depart11:14 Sun, Dec 13SAN → SEA 5h 53m · 1 stop
$95one way, per person
View deal
See every date in December 2026 →

Plan the rest of your trip to Seattle

Where to stay, what to do and getting around, from our travel partners.

Where to stay

Hotels in SeattleCompare places to stay on Booking.com Find hotels →

Things to do

Things to do in SeattleTours, attractions and day trips on Klook Explore →

Getting around

Airport transfer in SeattlePre-book a driver to meet you at arrivals, with Kiwitaxi Book a transfer → Car hire in SeattleCompare rental cars from major brands on EconomyBookings Compare cars →

About flights from San Diego to Seattle

San Diego (SAN) and Seattle (SEA) are about 1,710 km apart. Direct flights take around 3h 05m, and recent direct fares were with Southwest Airlines. Over the next few months, one-way fares start from $65, and December 2026 is currently the cheapest month to fly.

These prices come from searches travellers made in the last 48 hours, so they move quickly. If you see a good fare, it's worth booking soon. FlightsExp is free to use: you book directly with our travel partner.

Frequently asked questions

How much is a flight from San Diego to Seattle?

The cheapest one-way fare we've seen recently is $65 with Frontier Airlines, departing Saturday, December 12, 2026. Over the coming months, the lowest fare in each month ranges from $65 to $126.

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

December 2026 currently has the lowest fares, from $65 one way.

Are there direct flights from San Diego to Seattle?

Yes. Recent direct fares were with Southwest Airlines.

How long is the flight from San Diego to Seattle?

A direct flight takes about 3h 05m. San Diego and Seattle are around 1,710 km apart.

Which airlines fly from San Diego to Seattle?

Recent fares on this route were with Frontier Airlines and Southwest Airlines.

More cheap flights from San Diego

Compare flights to Seattle from other cities →