$40 Cheap Flights from Seattle (SEA) to San Diego (SAN)

View $40 flight on Wed, Mar 25, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to San Diego Intl. Airport (SAN)

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Cheap Flights from Seattle to San Diego (SEA-SAN)

Prices were available within the past 7 days and start at $40 for one-way flights and $89 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Wed, Mar 25 - Tue, Mar 31
SEA
Seattle
SAN
San Diego
$89 Roundtrip, just found
$89
Roundtrip
just found
Select Southwest Airlines flight, departing Wed, Mar 25 from Seattle to San Diego, returning Tue, Mar 31, priced at $89 just found
Southwest Airlines
Wed, May 6 - Wed, May 13
SEA
Seattle
SAN
San Diego
$92 Roundtrip, found 2 hours ago
$92
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Wed, May 6 from Seattle to San Diego, returning Wed, May 13, priced at $92 found 2 hours ago
Delta
Tue, Apr 28 - Wed, May 6
SEA
Seattle
SAN
San Diego
$97 Roundtrip, just found
$97
Roundtrip
just found
Select Delta flight, departing Tue, Apr 28 from Seattle to San Diego, returning Wed, May 6, priced at $97 just found
Southwest Airlines
Fri, Apr 17 - Tue, Apr 21
SEA
Seattle
SAN
San Diego
$99 Roundtrip, just found
$99
Roundtrip
just found
Select Southwest Airlines flight, departing Fri, Apr 17 from Seattle to San Diego, returning Tue, Apr 21, priced at $99 just found
Delta
Wed, Mar 25 - Tue, Mar 31
SEA
Seattle
SAN
San Diego
$102 Roundtrip, just found
$102
Roundtrip
just found
Select Delta flight, departing Wed, Mar 25 from Seattle to San Diego, returning Tue, Mar 31, priced at $102 just found
Delta
Tue, Apr 28 - Wed, May 6
SEA
Seattle
SAN
San Diego
$105 Roundtrip, just found
$105
Roundtrip
just found
Select Delta flight, departing Tue, Apr 28 from Seattle to San Diego, returning Wed, May 6, priced at $105 just found
Delta
Tue, May 12 - Tue, May 19
SEA
Seattle
SAN
San Diego
$108 Roundtrip, found 2 hours ago
$108
Roundtrip
found 2 hours ago
Select Delta flight, departing Tue, May 12 from Seattle to San Diego, returning Tue, May 19, priced at $108 found 2 hours ago
Alaska Airlines
Tue, May 5 - Tue, May 12
SEA
Seattle
SAN
San Diego
$121 Roundtrip, found 2 hours ago
$121
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Tue, May 5 from Seattle to San Diego, returning Tue, May 12, priced at $121 found 2 hours ago
United
Tue, May 5 - Tue, May 12
SEA
Seattle
SAN
San Diego
$133 Roundtrip, found 2 hours ago
$133
Roundtrip
found 2 hours ago
Select United flight, departing Tue, May 5 from Seattle to San Diego, returning Tue, May 12, priced at $133 found 2 hours ago
Frontier Airlines
Mon, Apr 13 - Fri, Apr 17
SEA
Seattle
SAN
San Diego
$180 Roundtrip, just found
$180
Roundtrip
just found
Select Frontier Airlines flight, departing Mon, Apr 13 from Seattle to San Diego, returning Fri, Apr 17, priced at $180 just found

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Alternative airports near San Diego

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to General Abelardo L. Rodriguez Intl. TIJ. Average driving time to city center is 26 minutes. Flights from $923
TIJ
General Abelardo L. Rodriguez Intl.
Average driving time to city center26 min
Flights from $923
Select flight to McClellan-Palomar CLD. Average driving time to city center is 38 minutes. Flights from $642
CLD
McClellan-Palomar
Average driving time to city center38 min
Flights from $642

Find the cheapest month to fly from Seattle (SEA) to San Diego (SAN)

January is typically the cheapest month to fly

From $87 - $151 per traveler.

Frequently asked questions

How much does a flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) cost?
You can find cheap one-way flights from $40 and cheap return flights from $89 Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) with Expedia. One-way flights typically cost between $104 and $794, and return flights often range between $216 and $3006. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) ticket fares go up or down.*Typical price ranges based on flights available on Expedia in the last year. Prices include multi-airline options.
What is the cheapest month to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
January is the cheapest month to fly from Seattle, WA (SEA) to San Diego, CA (SAN), with average return fares around $199. This is about 27% lower than the average price throughout the year, as demand typically decreases after the holiday season. Other economical months to consider are September and October.*Averages based on flights available on Expedia in the last year.
Which airlines fly direct from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
3 airlines operate nonstop service from SEA to SAN:

  • Delta operates around 35 direct flights from SEA to SAN every week
  • Hawaiian Airlines operates around 42 direct flights from SEA to SAN every week
  • Japan Airlines operates around 14 direct flights from SEA to SAN every week

What is the cheapest airline that flies from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
American Airlines is one of the cheapest airlines offering nonstop flights from Seattle (SEA) to San Diego (SAN), with round-trip tickets starting from around $358. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.*Prices based on flights available on Expedia in the last year.
How do I find cheap flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
To find a cheap flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The best airline to fly with from Seattle, WA (SEA) to San Diego, CA (SAN) will differ from traveler to traveler. If you like to fly early, Alaska Airlines offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. Alaska Airlines offers the most daily flights from Seattle to San Diego, which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The best time to fly from Seattle (SEA) to San Diego (SAN) is typically in January or September. During these months, you can find return flights at around $199, making it a budget-friendly option. January is quieter after the holiday rush, while September offers pleasant weather and fewer crowds, giving you a great travel experience.*Prices based on flights available on Expedia in the last year.
How many flights per day from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
You can find approximately 6 nonstop flights per day from Seattle - Tacoma Intl. (SEA) to San Diego Intl. (SAN). For more options, look at flights that include layovers.
What is the earliest flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The earliest flight from Seattle - Tacoma International Airport (SEA) to San Diego International Airport (SAN) typically departs at around 12:05 AM, operated by American Airlines. An early departure like this allows you to make the most of your day in San Diego. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What are the most popular departure times for flights from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
The most popular departure times for flights from Seattle (SEA) to San Diego (SAN) are from 6am to 9am. About 25% of passengers prefer this time window. Southwest Airlines, Delta, and Alaska Airlines offer flights during this window. Many travelers prefer this timing because it allows for a full day of fun in San Diego upon arrival.
How long does it take to fly from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
A nonstop flight from SEA to SAN typically takes around 2 hours 50 minutes, covering approximately 1,051 miles. Connecting flights on this route usually add 4 hours to your travel time. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
Business class seats are offered on the SEA to SAN route with JetBlue Airways.First class cabins are available on:

  • Delta Air Lines
  • United Airlines
  • American Airlines
  • Hawaiian Airlines

How much is a business class flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
A direct, return business class ticket from Seattle (SEA) to San Diego (SAN) typically costs between $831 - $1,304. A non-stop, one-way business class flight is usually around $387 - $586. Prices often fluctuate based on seasonality and how early you book. You may also be able to find a cheaper business class journey between Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) if you opt for a connecting flight.*Prices based on flights available on Expedia in the last year.
How do I earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) flight with Expedia?
It's easy to earn miles on a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for San Diego from Seattle - Tacoma Intl. (SEA)?
From Seattle - Tacoma Intl. (SEA), you can fly into San Diego Intl. (SAN) to reach San Diego. Some flights may connect through major hubs like San Francisco Intl. (SFO), Denver Intl. (DEN), Los Angeles Intl. (LAX) before reaching San Diego. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) at the last minute?
Typically, booking a last minute flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) flight and hotel package?
Securing a Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) San Diego Vacation Packages is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.)?
If you booked your Seattle, WA (SEA-Seattle - Tacoma Intl.) to San Diego, CA (SAN-San Diego Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Sun Country Airlines, United
Roundtrip price
$89
Distance
1051 mi
Average flight time
2 hours 46 mins

Book with confidence

Seattle to San Diego Flights

The cheapest times to fly from Seattle to San Diego

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Seattle to San Diego are during the month of March. You can find some of the cheapest flights from Seattle to San Diego with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Seattle to San Diego

Sunday is one of the best days to book for cheap flights from Seattle to San Diego: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Seattle to San Diego

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Seattle to San Diego in 2026. You can also book with separate airlines for your outbound and return journeys, from $40 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Seattle to San Diego flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Seattle to San Diego airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Seattle to San Diego Flights

*Flight schedules are subject to change.

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*Available to One Key members.