San Francisco – Seattle, Washington (and vice versa). $97 (Basic Economy) / $167 (Regular Economy). Roundtrip, including all Taxes – The Flight Deal

Exciting airfare offers between San Francisco and Seattle!

The Matrix Airfare Search by ITA Software lists this fare at $167 for Regular Economy. On United, you can secure tickets for $97 (Basic Economy) and $167 (Regular Economy) during these dates.

The $167 fare includes advance seat assignment and a regular-sized carry-on.

United offers a $97 Basic Economy fare, which prohibits advance seat assignments, meaning your seat will be assigned randomly at check-in. Additionally, if your carry-on does not fit under the seat, a fee of $35 applies each way + applicable gate check fees, although it is complimentary with a United co-branded credit card or elite status.

What is The Shorthaul? It’s our ongoing feature showcasing deals under $200 for trips within 3,000 miles roundtrip.

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Space Needle, Seattle, Washington – Photo: Tiffany Von Arnim via Flickr, used under Creative Commons License (By 2.0)

Sample Travel Date:

• January 22nd – 25th, 2026

• This is just ONE SAMPLE travel date. For additional availability, refer to the “Fare Availability” and “How to Search for Availability” sections below.

Fare Availability:

• Valid for travel from mid-January 2026 to March 2026. Limited availability; tickets must be purchased at least 14 days in advance.

• Please note that while this fare is valid at the time of posting, it may no longer be available if this post is over two days old.

How to Search for Availability:

• This section is for checking availability. To purchase tickets, please scroll down to the “How to Buy” section.

• Use Matrix Airfare Search by ITA Software with the following criteria:
  • Origin: SFO
  • Advanced Routing Code:
    • Routing Codes: ua
    • Extension Codes:
      • This utilizes Matrix Airfare Search to find the Basic Economy fare. Enter those dates for United and you’ll see an option to upgrade to Regular Economy.
  • Destination: SEA
    • This works in both directions; SEA can be the origin with SFO as the destination as well.
  • Return Advanced Routing Code:
    • Routing Codes: ua
    • Extension Codes:
  • (Click on the Advanced Codes link to enter routing code information)
  • Select “See calendar of lowest fares”.
  • Choose a duration of “3-10” (This is a sample; you can use any seven-day range like 3-10 or 7-14).
• Beginner’s Guide on How to Use Matrix by ITA Software
• How to Understand Airfare Rules to Your Advantage

• The Matrix Airfare Search page should appear as follows once all values are inputted.

• You cannot purchase tickets directly through Matrix Airfare Search. To buy, refer to the “How to Buy” section below.

Fare Class:

• N (Basic Economy)
• G (Regular Economy)

Elite Qualifying Dollars:

Routing:

• SFO – SEA (Seattle) – SFO

Mileage:

• Miles Flown: 1,356 miles
• Redeemable Miles: 634 miles

How to Buy:

• Book directly on United using the dates found on Matrix Airfare Search by ITA Software.

Accommodations

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Car Rentals

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Activities and Tours

• Viator – The largest marketplace for destination activities and tours in the world.

For all the latest affordable flight deals from San Francisco/Bay Area:

For additional inexpensive Seattle flight deals:

* The Flight Deal receives a commission if you utilize the accommodation, car rental, activities, or travel insurance affiliate links to make a booking or apply for a credit card via our link. Thank you for your continued support.

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The Flight Deal does not sell travel products or services; we provide updates on third-party suppliers’ offers and link to their websites. The information we post is accurate at the time of publication, but we cannot control supplier offers, which may change or become unavailable. Please check their sites for the most current offers and all relevant terms and conditions.