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Cheap flights from San Diego to Seattle from C$ 121

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 31/3. Fares are subject to change and may not be available on all flights or dates of travel.
SAN — SEA
12 Apr — 19 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from San Diego to Seattle/Tacoma Intl are usually found in February or January, booked 84 days in advance, depart on a Monday or Tuesday and return on a Tuesday

Cheap flight deals from San Diego to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from San Diego to Seattle
Explore the most affordable flight options available from San Diego to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 March 2026.

Wed 15/43:00 p.m.
SAN
-
SEA
Nonstop3h 00m
Southwest
Wed 22/412:10 p.m.
SEA
-
SAN
Nonstop2h 55m
Southwest
Deal found 11/3C$ 143
Sat 25/42:55 p.m.
SAN
-
SEA
Nonstop3h 00m
Southwest
Wed 29/49:20 a.m.
SEA
-
SAN
2 stops8h 25m
Southwest
Deal found 10/3C$ 144
Wed 29/46:34 p.m.
SAN
-
SEA
Nonstop3h 11m
Alaska Airlines
Sun 3/59:07 a.m.
SEA
-
SAN
Nonstop2h 57m
Alaska Airlines
Deal found 12/3C$ 147
Tue 14/45:45 p.m.
SAN
-
SEA
1 stop5h 10m
Southwest
Tue 21/412:10 p.m.
SEA
-
SAN
Nonstop2h 55m
Southwest
Deal found 9/3C$ 148
Wed 6/55:45 p.m.
SAN
-
SEA
1 stop5h 10m
Southwest
Mon 11/59:40 a.m.
SEA
-
SAN
1 stop4h 15m
Southwest
Deal found 9/3C$ 155
Sat 25/48:40 a.m.
SAN
-
SEA
2 stops9h 35m
Southwest
Tue 28/46:50 a.m.
SEA
-
SAN
1 stop7h 30m
Southwest
Deal found 11/3C$ 158
Fri 1/51:40 p.m.
SAN
-
SEA
Nonstop3h 10m
Delta
Sun 3/57:35 a.m.
SEA
-
SAN
Nonstop2h 59m
Delta
Deal found 10/3C$ 162
Sat 25/48:40 a.m.
SAN
-
SEA
2 stops9h 35m
Southwest
Sat 2/59:00 a.m.
SEA
-
SAN
2 stops7h 55m
Southwest
Deal found 11/3C$ 165
Tue 7/45:45 p.m.
SAN
-
SEA
1 stop5h 10m
Southwest
Tue 14/411:40 a.m.
SEA
-
SAN
2 stops7h 45m
Southwest
Deal found 8/3C$ 169
Sat 25/45:55 p.m.
SAN
-
SEA
1 stop4h 35m
Southwest
Mon 27/46:15 p.m.
SEA
-
SAN
1 stop4h 50m
Southwest
Deal found 11/3C$ 170

Find flight deals from San Diego to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from San Diego (SAN) to Seattle (SEA). 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 13 March 2026.

Round-trip from

C$ 143

One-way from

C$ 121

Popular in

July

Cheapest in

February

Average price

C$ 377

Good one-way deal

C$ 188 or less
Southwest
  • Southwest
  • 15/4-22/4
  • Nonstop
  • 5h 55m total
  • San Diego to Seattle
Search Deals
United Airlines
  • United Airlines
  • 8/4
  • 1 total stop
  • 7h 35m total
  • San Diego to Seattle
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 52 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a one-way flight from San Diego to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Diego to Seattle 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 629,999 searches. Data last updated 13 March 2026.
Use the filters below to find and compare flights from San Diego to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Fri 1/5

6:55 p.m.-12:55 a.m.

1 stop6h 00m

Seattle/Tacoma Intl

Sat 9/5

11:15 a.m.-2:05 p.m.

Nonstop2h 50m

C$ 176

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Mon 6/4

7:30 p.m.-1:40 a.m.

1 stop6h 10m

Seattle/Tacoma Intl

Mon 13/4

11:40 a.m.-6:20 p.m.

1 stop6h 40m

C$ 188

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Thu 30/4

5:55 p.m.-12:55 a.m.

1 stop7h 00m

Seattle/Tacoma Intl

Mon 4/5

6:30 a.m.-12:10 p.m.

1 stop5h 40m

C$ 189
Quickest round-trip

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Thu 30/4

2:15 p.m.-5:20 p.m.

Nonstop3h 05m

Seattle/Tacoma Intl

Sat 9/5

11:15 a.m.-2:05 p.m.

Nonstop2h 50m

C$ 204

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Fri 24/4

2:15 p.m.-5:20 p.m.

Nonstop3h 05m

Seattle/Tacoma Intl

Sun 26/4

11:45 a.m.-2:40 p.m.

Nonstop2h 55m

C$ 215

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Fri 3/4

10:55 a.m.-2:00 p.m.

Nonstop3h 05m

Seattle/Tacoma Intl

Mon 13/4

6:15 p.m.-11:05 p.m.

1 stop4h 50m

C$ 229

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Fri 15/5

8:04 p.m.-11:18 p.m.

Nonstop3h 14m

Seattle/Tacoma Intl

Mon 18/5

9:45 p.m.-7:35 a.m.

1 stop9h 50m

C$ 272

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Thu 30/4

6:05 p.m.-1:12 a.m.

2 stops7h 07m

Seattle/Tacoma Intl

Mon 4/5

6:58 p.m.-11:59 p.m.

1 stop5h 01m

C$ 275

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Mon 1/6

5:55 p.m.-12:55 a.m.

1 stop7h 00m

Seattle/Tacoma Intl

Tue 9/6

3:25 p.m.-9:00 p.m.

1 stop5h 35m

C$ 276

San DiegoSeattle

SAN - SEA

SANSEA

San Diego

Fri 29/5

7:07 p.m.-5:23 p.m.

1 stop22h 16m

Seattle/Tacoma Intl

Sat 30/5

7:35 p.m.-10:26 p.m.

Nonstop2h 51m

C$ 312

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/3

Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from San Diego to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from San Diego with our price prediction graph.
Estimated round-trip 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 San Diego to Seattle

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

Use this chart to determine the optimal time to book a round-trip flight from San Diego to Seattle. Price data was last updated on 6 March 2026.

The price you pay for your flight from San Diego to Seattle may vary depending on when you book. For the best chance of a lower fare, look to book 84 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, January is the cheapest month in which you can book a flight from San Diego to Seattle (average of C$ 87). Flying from San Diego to Seattle in July is currently the most expensive (average of C$ 188). 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 SAN to SEA?

Find hourly flight availability from San Diego to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 March 2026.

A simple way to save on the total cost of your ticket is to fly from San Diego to Seattle at noon. If you’re flexible enough to do this you can expect to save up to 89% on your trip compared to booking a flight in the evening.

Related info for your journey

Find useful and relevant information for your journey from San Diego to Seattle. 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 San Diego to Seattle flight route?

    Flights from San Diego to Seattle/Tacoma Intl have been viewed 3 times in the past calendar month.

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

    Alaska Airlines and Southwest can get you from San Diego to Seattle in just under 3h 14m. Your travel time can differ by up to 3h 46m. San Diego and Seattle are separated by a distance of 1691 km. This flight may include one or multiple stops.

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

    Consider Icelandair (96%), American Airlines (96%) or Virgin Atlantic (93%) when booking your flight. These represent the most reliable airlines when flying from San Diego to Seattle.

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

    Looking at all options, your cheapest flight can be booked for C$ 140. While the most popular route (San Diego - Seattle/Tacoma Intl) can be booked for C$ 404 on average, our data indicates C$ 290 when flying from San Diego to Seattle.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from San Diego to Seattle 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 San Diego to Seattle?

    Currently, January is the cheapest month in which you can book a flight from San Diego to Seattle (average of C$ 87). Flying from San Diego to Seattle in July is currently the most expensive (average of C$ 188). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
Leavenworth
Mukilteo
Tacoma
Kent
Bothell
Cashmere
Tukwila
Olympia
Renton
Marysville
Lynnwood
Kirkland

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Certainly. Search results for flights to Seattle from San Diego shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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