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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 26/11. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — SEA
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from San Francisco to Seattle/Tacoma Intl are usually found in October or January, booked 75 days in advance, depart on a Thursday or Tuesday and return on a Saturday

Cheap 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 18 September 2025.

Round-trip from

£101

One-way from

£51

Popular in

July

Cheapest in

October

Average price

£193

Good one-way deal

£56 or less
Delta
  • Delta
  • 3/3-4/3
  • Nonstop
  • 4h 35m total
  • San Francisco to Seattle
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Delta
  • Delta
  • 15/10
  • Nonstop
  • 2h 15m total
  • San Francisco to Seattle
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Highest demand for flights based on searches. 7% potential increase in price (£10 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£3 potential savings vs. average return price).
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Average for round-trip flights in September 2025
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Price to beat on a one-way flight from San Francisco to Seattle/Tacoma Intl.
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Find flight deals from San Francisco to Seattle

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 18 September 2025.

Wed 15/1008:20SFO - SEA
Nonstop2h 14mAlaska Airlines
Wed 15/1012:00SEA - SFO
1 stop4h 27mAlaska Airlines
Deal found 16/9£103
Wed 15/1009:34SFO - SEA
Nonstop2h 12mAlaska Airlines
Thu 23/1007:00SEA - SFO
Nonstop2h 16mAlaska Airlines
Deal found 15/9£108
Thu 30/1014:46SFO - SEA
Nonstop2h 19mHawaiian Airlines
Thu 6/1113:31SEA - SFO
Nonstop2h 12mHawaiian Airlines
Deal found 15/9£108
Thu 25/1206:15SFO - SEA
Nonstop2h 16mDelta
Tue 30/1221:42SEA - SFO
Nonstop2h 17mDelta
Deal found 16/9£109
Thu 30/1008:00SFO - SEA
Nonstop2h 20mAlaska Airlines
Thu 30/1013:31SEA - SFO
Nonstop2h 12mAlaska Airlines
Deal found 16/9£111
Sat 1/1106:00SFO - SEA
Nonstop2h 20mDelta
Sat 8/1117:00SEA - SFO
Nonstop2h 05mDelta
Deal found 16/9£112
Tue 7/1005:30SFO - SEA
1 stop6h 15mSouthwest
Wed 8/1017:00SEA - SFO
1 stop6h 05mSouthwest
Deal found 17/9£113
Tue 16/1208:00SFO - SEA
1 stop3h 49mAlaska Airlines
Sat 10/105:30SEA - SFO
1 stop3h 19mAlaska Airlines
Deal found 16/9£114
Thu 18/1207:00SFO - SEA
Nonstop2h 17mAlaska Airlines
Thu 1/113:30SEA - SFO
Nonstop2h 16mAlaska Airlines
Deal found 15/9£115
Thu 30/1021:55SFO - SEA
1 stop11h 23mFrontier
Thu 6/1113:08SEA - SFO
1 stop11h 06mFrontier
Deal found 15/9£116
Wed 22/1015:50SFO - SEA
1 stop7h 10mSouthwest
Sat 25/1007:45SEA - SFO
2 stops9h 00mSouthwest
Deal found 16/9£116

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 18 September 2025.
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

Wed 15/10

08:20-10:34

Nonstop2h 14m

Seattle/Tacoma Intl

Wed 15/10

12:00-16:27

1 stop4h 27m

£103

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Thu 23/10

06:00-08:20

Nonstop2h 20m

Seattle/Tacoma Intl

Sun 26/10

07:25-09:55

Nonstop2h 30m

£108

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sat 13/12

20:31-22:49

Nonstop2h 18m

Seattle/Tacoma Intl

Mon 15/12

08:45-11:00

Nonstop2h 15m

£108

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Wed 14/1

16:40-18:55

Nonstop2h 15m

Seattle/Tacoma Intl

Mon 19/1

07:00-09:11

Nonstop2h 11m

£108

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sat 18/10

18:20-20:35

Nonstop2h 15m

Seattle/Tacoma Intl

Thu 23/10

18:59-21:12

Nonstop2h 13m

£108

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sat 1/11

21:00-23:15

Nonstop2h 15m

Seattle/Tacoma Intl

Sun 2/11

09:25-11:46

Nonstop2h 21m

£115

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Sun 14/12

10:30-12:52

Nonstop2h 22m

Seattle/Tacoma Intl

Tue 16/12

13:37-15:57

Nonstop2h 20m

£115

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Fri 24/10

06:00-08:20

Nonstop2h 20m

Seattle/Tacoma Intl

Fri 31/10

05:25-12:20

1 stop6h 55m

£115

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Thu 19/2

17:45-20:02

Nonstop2h 17m

Seattle/Tacoma Intl

Sat 21/2

12:50-19:19

1 stop6h 29m

£115

San FranciscoSeattle

SFO - SEA

SFOSEA

San Francisco

Thu 9/10

07:00-09:10

Nonstop2h 10m

Seattle/Tacoma Intl

Sat 11/10

08:00-11:51

1 stop3h 51m

£115

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 22 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 12 September 2025.

To ensure you get the cheapest price possible for a flight from San Francisco to Seattle, you should look to book at least 40 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 £622). Flying from San Francisco to Seattle in July is currently the most expensive (average of £946). 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 18 September 2025.

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 51% on your trip compared to booking a flight in the afternoon.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated 18 September 2025.
Check out reviews from past customers who have flown with Alaska Airlines from San Francisco to Seattle to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very Good
10,000 reviews
Alaska Airlines
8.0
Very Good
10,000 reviews
Check prices

Entertainment

7.1

Food

7.1

Overall

8.0

Comfort

7.8

Crew

8.5

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

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.

  • What airports do I use to fly from San Francisco to Seattle?

    If you book a flight from San Francisco to Seattle, you will be flying from San Francisco to Seattle/Tacoma Intl. Flights to Seattle/Tacoma Intl (SEA) from San Francisco (SFO) take 2h 15m for a nonstop flight. There are 86 flights from San Francisco to Seattle per day from 1 airline.

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

    Flights from San Francisco to Seattle/Tacoma Intl have been viewed 17 times in the past calendar month.

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

    Alaska Airlines and Delta can get you from San Francisco to Seattle in just under 2h 14m. Your travel time will be generally consistent. Airlines will cover a distance of 679 mi. Generally, flights for this route are direct.

  • What is the cheapest airline to fly from San Francisco to Seattle round-trip?

    Currently priced at £115, Alaska Airlines will fly you from San Francisco to Seattle and back. In addition to Alaska Airlines, many other airlines offer competitively priced options for your trip. Alaska Airlines is priced at 34% lower than the current average price of a flight leaving 3 months from now.

  • What are the cheapest airlines to fly from San Francisco to Seattle one-way?

    The cheapet airlines for a one-way flight from San Francisco to Seattle are Delta (£51), Alaska Airlines (£51), and United Airlines (£51).

  • 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: Scandinavian Airlines (90%), Air China (88%), WestJet (88%).

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

    Looking at all options, your cheapest flight can be booked for £49. While the most popular route (San Francisco - Seattle/Tacoma Intl) can be booked for £106 on average, our data indicates £84 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 £622). Flying from San Francisco to Seattle in July is currently the most expensive (average of £946). 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
Leavenworth
Bothell
SeaTac

Browse thousands of different options on Cheapflights for your next trip

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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.
Los Angeles to Seattle flights
San Diego to Portland flights
San Diego to Seattle flights
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San Jose to Seattle flights

Top airline flying from San Francisco to Seattle

Discover the top airline that operate flights from San Francisco to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 18 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Alaska AirlinesCheapest£115Average£201FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines 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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