Cheap Flights San Francisco to Seattle from £48

Flight FAQs

• Which airlines offer the cheapest flights from San Francisco (SFO) to Seattle (SEA)?

  Based on Trip.com data, Frontier Airlines offers one-way fares as low as £48 on Cheapest nonstop routes (e.g. SFO to SEA on Tue, Sep 15), while Alaska Airlines offers Cheapest nonstop round-trips from £99 departing on Tue, Sep 15 and returning on Thu, Sep 17.

• Which airlines offer direct flights from San Francisco to Seattle?

  At the moment, you can catch a direct flight from San Francisco to Seattle with the following airlines, including: Alaska Airlines United Airlines Selected airlines are based on historical data collected from flight bookings users made on Trip.com within the last 90 days.

• How long is the flight from San Francisco (SFO) to Seattle (SEA)?

  It takes about 2 hours 14 minutes to fly from San Francisco (SFO) to Seattle (SEA).

• When is the best time to book flights from San Francisco to Seattle?

  By analyzing data from all airlines on the Trip.com flight calendar, it looks like the best time to book a flight from San Francisco to Seattle is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

• How many flights are there per week from San Francisco to Seattle?

  Based on Trip.com data in the past 4 weeks, there is 135 flight per week flying from San Francisco to Seattle. You can check the weekly schedule for popular airlines on this route below: Alaska Airlines: S/M/T/W/T/F/S -- AS620 (06:13)

• How can I find the best deals on flights from San Francisco to Seattle?

  To find best deals on flights from San Francisco to Seattle, you can use various tools on Trip.com:
  · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Tue, Sep 15, with one-way flights priced at just £48.
  · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Alaska Airlines.
  · Set up price alerts to easily monitor ticket prices without having to check every day.
  · Check Trip.com flight deals and promo codes frequently.
  · Avoid peak season unless you book very early. It seems the peak season for Seattle travel is around July.
  · Get exclusive promo codes for Trip.com app users.

• When is the best time to book a flight from San Francisco to Seattle to get the best price?

  The cheapest months to fly from San Francisco to Seattle is November, when demand for travel is lower.

• Which upcoming date is the cheapest for flights from San Francisco to Seattle?

  After crunching the numbers on our August flight calendar, it's currently cheapest to fly from San Francisco to Seattle on August 15, 2026 with Alaska Airlines, with prices starting at £47.

• Which airports can I fly through when travelling to Seattle from San Francisco?

  You can land at any one of the following hubs in Seattle, with San Francisco International Airport to Seattle-Tacoma International Airport (SFO-SEA) is by far the most common option on this route: King County (Boeing Field) International Airport (BFI) Kenmore Air Harbor Seaplane Base (LKE) Seattle-Tacoma International Airport (SEA).

• What is the time difference between San Francisco and Seattle?

  The time difference between Seattle and San Francisco is 0m.

• How can I change or cancel my flight ticket from San Francisco to Seattle?

  Tickets can only be changed or cancelled if permitted by airline policy. To submit a change or cancellation request, go to the flight bookings page, select the option to change or cancel your booking, choose the relevant passengers and segment, and submit a request. Please note that additional charges may apply according to the airline ticket policy. However, if the flight has been rescheduled and you would like to change or cancel your ticket, you can submit an involuntary cancellation request. For more details about change and cancellation policies, please check the customer support pages.

• What is the average cost of a one-way flight from San Francisco to Seattle?

  Based on Trip.com data for flights departing in the next 30 days, the average one-way fare from San Francisco to Seattle is £113. Fares vary by travel date, airline and availability.

• What is the average cost of a return flight from San Francisco to Seattle?

  Based on Trip.com data for travel in the next 30 days, the average round-trip fare from San Francisco to Seattle is £201. The final price depends on the outbound and return dates, airline and fare conditions.

• How do I book flights from San Francisco to Seattle on Trip.com?

  Enter San Francisco and Seattle, choose your travel dates and passengers, then compare flights by price, duration and baggage. Select a fare, review the change and cancellation rules, enter traveller details and complete payment to receive your confirmation.

• Are there budget airlines on the San Francisco to Seattle route?

  Frontier Airlinesare the most popular budget airlines flying from San Francisco to Seattle. Check baggage, seat and payment fees before comparing the final price.