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Cheap flights from Seattle to San Diego from £74

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SAN
15 Jun — 22 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Seattle/Tacoma Intl to San Diego are usually found in January or September, booked 51 days in advance, depart on a Monday or Tuesday and return on a Monday

Cheap flight deals from Seattle to San Diego

Enter your travel dates to find the best prices.

Cheapest flights from Seattle to San Diego
Explore the most affordable flight options available from Seattle to San Diego. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 May 2026.

Fri 5/613:30
SEA
-
SAN
1 stop5h 05m
United Airlines
Tue 9/616:09
SAN
-
SEA
1 stop7h 23m
United Airlines
Deal found 12/5£142
Wed 4/1118:25
SEA
-
SAN
Nonstop2h 45m
Southwest
Wed 11/1117:00
SAN
-
SEA
1 stop4h 25m
Southwest
Deal found 15/5£143
Fri 5/606:30
SEA
-
SAN
1 stop6h 45m
Southwest
Tue 9/614:40
SAN
-
SEA
1 stop4h 10m
Southwest
Deal found 13/5£144
Wed 29/715:25
SEA
-
SAN
1 stop5h 35m
Southwest
Tue 4/807:00
SAN
-
SEA
Nonstop3h 05m
Southwest
Deal found 12/5£146
Sat 6/615:55
SEA
-
SAN
Nonstop2h 50m
Southwest
Mon 8/618:05
SAN
-
SEA
1 stop6h 00m
Southwest
Deal found 13/5£148
Tue 9/615:25
SEA
-
SAN
1 stop6h 45m
Southwest
Tue 16/613:55
SAN
-
SEA
Nonstop2h 55m
Southwest
Deal found 13/5£148
Wed 1/716:45
SEA
-
SAN
1 stop6h 10m
Southwest
Wed 8/714:40
SAN
-
SEA
1 stop4h 10m
Southwest
Deal found 13/5£150
Sat 6/607:26
SEA
-
SAN
Nonstop2h 56m
Alaska Airlines
Tue 9/617:17
SAN
-
SEA
Nonstop3h 11m
Alaska Airlines
Deal found 11/5£151
Sat 6/612:55
SEA
-
SAN
1 stop7h 15m
Southwest
Tue 9/606:40
SAN
-
SEA
2 stops6h 55m
Southwest
Deal found 13/5£151
Tue 4/806:21
SEA
-
SAN
Nonstop2h 49m
Alaska Airlines
Sat 22/806:15
SAN
-
SEA
Nonstop3h 08m
Alaska Airlines
Deal found 11/5£152
Tue 9/621:09
SEA
-
SAN
Nonstop2h 50m
Alaska Airlines
Wed 17/611:00
SAN
-
SEA
1 stop11h 39m
Alaska Airlines
Deal found 13/5£154

Find flight deals from Seattle to San Diego

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to San Diego (SAN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 16 May 2026.

Round-trip from

£142

One-way from

£74

Popular in

December

Cheapest in

January

Average price

£215

Good round-trip deal

£225 or less
United Airlines
  • United Airlines
  • 22/8-24/8
  • 2 total stops
  • 10h 13m total
  • Seattle to San Diego
Search Deals
Alaska Airlines
  • Alaska Airlines
  • 9/6
  • Nonstop
  • 2h 51m total
  • Seattle to San Diego
Search Deals
High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 1% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
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Price to beat on a round-trip flight from Seattle/Tacoma Intl to San Diego.
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Seattle to San Diego that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 May 2026.
Use the filters below to find and compare flights from Seattle to San Diego that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Wed 5/8

05:15-09:59

1 stop4h 44m

San Diego

Wed 12/8

17:00-21:58

1 stop4h 58m

£142

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Wed 29/7

17:53-20:49

Nonstop2h 56m

San Diego

Tue 4/8

06:18-09:19

Nonstop3h 01m

£159

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Thu 20/8

06:15-12:35

1 stop6h 20m

San Diego

Tue 25/8

07:00-10:05

Nonstop3h 05m

£160

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Thu 4/6

21:09-23:59

Nonstop2h 50m

San Diego

Tue 9/6

08:56-14:57

1 stop6h 01m

£165

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Thu 1/10

06:35-12:55

1 stop6h 20m

San Diego

Tue 6/10

16:15-21:55

2 stops5h 40m

£184

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Wed 1/7

16:45-22:55

1 stop6h 10m

San Diego

Mon 6/7

14:00-16:55

Nonstop2h 55m

£190
Fastest return journey

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Fri 10/7

06:21-09:10

Nonstop2h 49m

San Diego

Thu 16/7

06:18-09:19

Nonstop3h 01m

£200

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Wed 1/7

10:10-19:21

1 stop9h 11m

San Diego

Thu 9/7

18:35-21:35

Nonstop3h 00m

£202

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Thu 11/6

17:20-23:05

1 stop5h 45m

San Diego

Tue 16/6

06:40-13:35

2 stops6h 55m

£208

SeattleSan Diego

SEA - SAN

SEASAN

Seattle/Tacoma Intl

Wed 1/7

10:10-19:21

1 stop9h 11m

San Diego

Sun 5/7

20:35-23:41

Nonstop3h 06m

£220

Flights are sorted by cheapest return flights first.

Deals found on 13/5

Showing 1-10 of 22 resultsSorted by cheapest first
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Best time to book a flight from Seattle to San Diego

Have a flexible travel schedule? Discover the best time to fly to San Diego from Seattle with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to San Diego

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

The best time to book flights from Seattle to San Diego is 50 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Seattle to San Diego?

Currently, January is the cheapest month in which you can book a flight from Seattle to San Diego (average of £144). Flying from Seattle to San Diego in December is currently the most expensive (average of £236). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SEA to SAN?

Find hourly flight availability from Seattle to San Diego. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 16 May 2026.

It’s optimal to fly from Seattle to San Diego at midday. By choosing this option you can save up to 67% on the cost of your flight, compared to a flight in the morning.

How much does it cost for a return flight from Seattle to San Diego?

Related info for your journey

Find useful and relevant information for your journey from Seattle to San Diego. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Seattle to San Diego flight route?

    This flight path from Seattle/Tacoma Intl to San Diego was viewed by 1 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Seattle to San Diego?

    Departing from Seattle to San Diego will take you 2h 59m. Seattle and San Diego are separated by a distance of 1051 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most reliable airlines from Seattle to San Diego?

    No one likes to see their flight delayed. When booking a flight from Seattle to San Diego consider choosing WestJet (89%), KLM (87%) or Alaska Airlines (86%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to San Diego?

    Looking for the cheapest flight from Seattle to San Diego? While on average our users pay £225, our data indicates the cheapest price to be £225. The most popular route (Seattle/Tacoma Intl - San Diego), is priced around £178.

  • Can I find deals for flights from Seattle to San Diego that include hotel bookings?

    Yes. In addition to deals on Seattle to San Diego flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to San Diego?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to San Diego.

  • Can I find deals for business class flights from Seattle to San Diego?

    Yes. Cheapflights offers flight deals from Seattle to San Diego by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to San Diego?

    Currently, January is the cheapest month in which you can book a flight from Seattle to San Diego (average of £144). Flying from Seattle to San Diego in December is currently the most expensive (average of £236). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near San Diego?

Book flights to San Diego if you plan to visit one of these locations
Coronado
El Cajon

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Why should you use Cheapflights to find cheap flight tickets from Seattle to San Diego?

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Can Cheapflights find flights from Seattle to San Diego with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Seattle to San Diego flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Seattle to San Diego become cheaper?

Yes, Cheapflights offers price alerts on Seattle to San Diego flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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