Southwest® flights from Seattle/Tacoma to San Diego from $48
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Low fares from Seattle/Tacoma to San Diego
$
Seattle/Tacoma (SEA)to
San Diego (SAN)
Depart: 01/27/2026
One-way
Basic
From
$48
Seen: 1 hour ago
Seattle/Tacoma (SEA)to
San Diego (SAN)
Depart: 03/13/2026
One-way
Basic
From
$60
Seen: 4 hrs ago
Seattle/Tacoma (SEA)to
San Diego (SAN)
Depart: 03/15/2026
One-way
Basic
From
$60
Seen: 14 hrs ago
Seattle/Tacoma (SEA)to
San Diego (SAN)
Depart: 03/09/2026
One-way
Basic
From
$60
Seen: 11 hrs ago
Seattle/Tacoma (SEA)to
San Diego (SAN)
Depart: 03/14/2026
One-way
Basic
From
$60
Seen: 6 hrs ago
Seattle/Tacoma (SEA)to
San Diego (SAN)
Depart: 03/11/2026
One-way
Basic
From
$60
Seen: 2 hrs ago
Explore flights from Seattle/Tacoma to San Diego
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Travel tips for your next Southwest flight
How to board the plane earlier on open seating flights departing on or before January 26, 2026:
Southwest seats are first come, first served based on check-in order. But there are ways to board the plane earlier!
- Purchase EarlyBird Check-In®1 for automatic check-in and a better boarding position.
- Purchase Upgraded Boarding2 to get an A1-A15 boarding position (depending on availability).
- Purchase a Business Select® fare or upgrade to Business Select to get a guaranteed A1-A15 boarding position.
Enjoy movies, sips, and snacks during your flight.
Take advantage of inflight entertainment with free movies4, free live TV5, free texting6, and $8 inflight Internet7.
We also offer free sodas, coffee, and snacks8—learn more about the inflight food and beverage experience.
Make the most of our Rapid Rewards® Program.
Rapid Rewards Members can redeem their points for flights, hotel stays, rental cars, gift cards, and more. And your points never expire!
Flight Details
Departing from:
Seattle/Tacoma International Airport
Arriving at:
San Diego International Airport
Distance:
1050 miles
Route Information
151† Weekly flights
† Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.
‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.
Explore San Diego
Imagine yourself in San Diego, California—and then make it happen! Whether you’re visiting for business, pleasure, or a mix of both, Southwest offers a variety of travel options to help you transform your California dream into a reality. San Diego is located in the southernmost region of the state along the bucolic, surfer-friendly Pacific coastline. The weather here is warm and inviting, with temperatures averaging in the 70s year round. But believe it or not, San Diego holds a few gems that outshine the sunshine. From stunning beaches with breathtaking views to an exceptional restaurant scene and more, San Diego delights visitors and residents alike with its irresistible charm, making it hard to ever leave.
Explore San Diego’s top sites during your trip. For starters, this city is home to the world-famous San Diego Zoo. See the zoo during your trip, and learn the stories of more than 3,700 animals. If you’re an ocean and/or history lover, San Diego’s Maritime Museum is a must see. At the museum, you can explore the decks of The Star of India, the world’s oldest active sailing ship.
Questions we hear the most
There are 151 weekly flights from Seattle/Tacoma to San Diego on Southwest Airlines.
To find the lowest fares by day and time to fly Seattle/Tacoma to San Diego with Southwest, check out our Low Fare Calendar.
You can rent a car at San Diego International Airport book yours with your flight.
Yes! Flights from Seattle/Tacoma to San Diego—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
Check the status of your upcoming Southwest flight.
Check out the Southwest Airlines® Help Center for answers about everything Southwest.
Explore Flights from Other Popular Origins
Popular Flights from Seattle/Tacoma
1EarlyBird Check-In® pricing starts at $15 one-way, and is subject to availability. Pricing may vary based on the popularity and length of each (one-way) flight. Please see optional travel charges for more details.
2Upgraded boarding prices and benefits are per eligible segment. Flights must be within 24 hours of departure to be eligible for upgraded boarding.
3Where available. Available only on WiFi-enabled aircraft. Limited-time offer.
4Due to licensing restrictions, on WiFi-enabled international flights, free live TV and iHeartRadio may not be available for the full duration of flight.
5Texting only allows access to iMessage and WhatsApp (which must be downloaded and activated before connecting to SouthwestWiFi).
6Internet access for $8 per device from takeoff to landing. Price is subject to change. May not be available for the full duration of flight. In order to provide a top-notch Internet experience, we prohibit access to certain high-bandwidth applications and websites. We also prohibit access to certain obscene or offensive content.
7Flights traveling 175 miles or less will have only water available. Complimentary snacks are served on flights over 175 miles. If you’re flying between Hawaii and the continental U.S., you’ll have even more snacks to choose from.