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Cheap flights from San Francisco to Seattle from £51

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 18/4. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — SEA
21 Mar — 28 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from San Francisco to Seattle/Tacoma Intl are usually found in May or April, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Wednesday

Cheap flight deals from San Francisco to Seattle

Enter your travel dates to find the best prices.

Cheapest flights from San Francisco to Seattle
Explore the most affordable flight options available from San Francisco to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 19 February 2026.

Tue 5/514:00
SFO
-
SEA
Nonstop2h 17m
Alaska Airlines
Tue 5/520:05
SEA
-
SFO
Nonstop2h 23m
Alaska Airlines
Deal found 18/2£97
Sun 3/520:00
SFO
-
SEA
Nonstop2h 20m
Delta
Tue 5/511:45
SEA
-
SFO
Nonstop2h 20m
Delta
Deal found 18/2£101
Thu 12/306:00
SFO
-
SEA
Nonstop2h 14m
Delta
Mon 16/321:45
SEA
-
SFO
Nonstop2h 12m
Delta
Deal found 19/2£102
Wed 6/510:28
SFO
-
SEA
1 stop5h 35m
Alaska Airlines
Wed 6/519:04
SEA
-
SFO
Nonstop2h 19m
Alaska Airlines
Deal found 18/2£104
Thu 19/306:00
SFO
-
SEA
1 stop6h 49m
Delta
Mon 23/321:45
SEA
-
SFO
Nonstop2h 12m
Delta
Deal found 19/2£109
Tue 7/414:57
SFO
-
SEA
Nonstop2h 16m
Alaska Airlines
Tue 7/420:10
SEA
-
SFO
Nonstop2h 17m
Alaska Airlines
Deal found 17/2£112
Mon 30/320:58
SFO
-
SEA
Nonstop2h 29m
United Airlines
Wed 1/407:12
SEA
-
SFO
Nonstop2h 18m
United Airlines
Deal found 18/2£114
Tue 14/417:00
SFO
-
SEA
1 stop6h 59m
Delta
Wed 22/410:15
SEA
-
SFO
1 stop5h 06m
Delta
Deal found 18/2£116
Tue 10/311:34
SFO
-
SEA
Nonstop2h 21m
Alaska Airlines
Tue 10/317:04
SEA
-
SFO
2 stops6h 40m
Alaska Airlines
Deal found 17/2£119
Wed 22/411:25
SFO
-
SEA
2 stops9h 35m
Southwest
Tue 28/408:25
SEA
-
SFO
1 stop8h 15m
Southwest
Deal found 18/2£120
Thu 12/306:00
SFO
-
SEA
Nonstop2h 14m
Delta
Sat 14/316:25
SEA
-
SFO
Nonstop2h 18m
Delta
Deal found 17/2£121
Sat 14/306:00
SFO
-
SEA
Nonstop2h 14m
Delta
Mon 16/321:45
SEA
-
SFO
Nonstop2h 12m
Delta
Deal found 17/2£122

Find flight deals from San Francisco to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) 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 19 February 2026.

Round-trip from

£97

One-way from

£51

Popular in

November

Cheapest in

May

Average price

£175

Good one-way deal

£115 or less
Alaska Airlines
  • Alaska Airlines
  • 5/5-5/5
  • Nonstop
  • 4h 40m total
  • San Francisco to Seattle
Search Deals
United Airlines
  • United Airlines
  • 12/3
  • Nonstop
  • 2h 13m total
  • San Francisco to Seattle
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£12 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£3 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
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Price to beat on a one-way flight from San Francisco to Seattle/Tacoma Intl.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from San Francisco 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 858,174 searches. Data last updated 19 February 2026.
Use the filters below to find and compare flights from San Francisco to Seattle that are best for you.

Fly from

San Francisco

Fly to

Seattle

Route

Depart

Return

Price

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Thu 9/4

06:00-08:16

Nonstop2h 16m

Seattle/Tacoma Intl

Sat 11/4

21:55-00:07

Nonstop2h 12m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Thu 12/3

06:00-08:14

Nonstop2h 14m

Seattle/Tacoma Intl

Mon 16/3

21:45-23:57

Nonstop2h 12m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sun 5/4

06:00-08:16

Nonstop2h 16m

Seattle/Tacoma Intl

Tue 14/4

07:00-09:22

Nonstop2h 22m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sun 3/5

05:55-08:13

Nonstop2h 18m

Seattle/Tacoma Intl

Sat 9/5

07:17-09:37

Nonstop2h 20m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Tue 17/3

14:55-17:09

Nonstop2h 14m

Seattle/Tacoma Intl

Thu 19/3

21:45-23:57

Nonstop2h 12m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sat 28/3

10:31-12:51

Nonstop2h 20m

Seattle/Tacoma Intl

Wed 1/4

07:25-09:51

Nonstop2h 26m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Tue 5/5

10:32-12:55

Nonstop2h 23m

Seattle/Tacoma Intl

Mon 11/5

17:21-19:35

Nonstop2h 14m

£101

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Wed 11/3

11:34-13:55

Nonstop2h 21m

Seattle/Tacoma Intl

Wed 11/3

17:10-23:44

1 stop6h 34m

£104

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Fri 24/4

20:00-22:20

Nonstop2h 20m

Seattle/Tacoma Intl

Tue 28/4

17:59-23:10

1 stop5h 11m

£109

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Thu 14/5

18:30-23:55

1 stop5h 25m

Seattle/Tacoma Intl

Sun 17/5

09:55-12:23

Nonstop2h 28m

£109

Flights are sorted by cheapest return flights first.

Deals found on 18/2

Showing 1-10 of 21 results
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Best time to book a flight from San Francisco to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from San Francisco 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 San Francisco to Seattle

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

Use this chart to determine the optimal time to book a return flight from San Francisco to Seattle. Price data was last updated on 18 February 2026.

To ensure you get the cheapest price possible for a flight from San Francisco to Seattle, you should look to book at least 69 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from San Francisco to Seattle (average of £57). Flying from San Francisco to Seattle in May is currently the most expensive (average of £101). 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 SFO to SEA?

Find hourly flight availability from San Francisco 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 19 February 2026.

A simple way to save on the total cost of your ticket is to fly from San Francisco to Seattle at midday. If you’re flexible enough to do this you can expect to save up to 85% 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 Francisco 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 Francisco to Seattle flight route?

    Flights from San Francisco to Seattle/Tacoma Intl have been viewed 9 times in the past calendar month.

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

    Delta can get you from San Francisco to Seattle in just under 2h 16m. Your travel time will be generally consistent. Airlines will cover a distance of 679 mi. Generally, flights for this route are direct.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Francisco to Seattle on time: Southwest (100%), Japan Airlines (88%), WestJet (85%).

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

    Looking at all options, your cheapest flight can be booked for £36. While the most popular route (San Francisco - Seattle/Tacoma Intl) can be booked for £454 on average, our data indicates £215 when flying from San Francisco to Seattle.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from San Francisco to Seattle (average of £57). Flying from San Francisco to Seattle in May is currently the most expensive (average of £101). 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
Tacoma
Federal Way
SeaTac

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Alternative routes for San Francisco to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
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San Diego to Portland flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from San Francisco to Seattle?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Seattle from San Francisco today with Cheapflights!

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from San Francisco to Seattle for you. Better yet — we are completely free to use.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from San Francisco to Seattle, users can toggle the no change fees filter when performing a flight search.

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

Of course! You can now track prices for flights from San Francisco to Seattle and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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