Cheapest weekends to fly San Francisco to Seattle nonstop

We price every nonstop weekend round-trip (2–4 nights, leaving Thu–Sat) on SFO → SEA and rank the weekends below by date. Right now the cheapest is Oct 3–6 at $117 round-trip — 41% below this route's typical short-trip price. Updated August 31, 2026.

Thu, Sep 3 → Sun, Sep 6 3 nights

UA United

$433 Check this weekend →

Sat, Sep 12 → Tue, Sep 15 3 nights

AS Alaska

$513 Check this weekend →

Fri, Sep 18 → Mon, Sep 21 3 nights

AS Alaska

$234 Check this weekend →

Thu, Sep 24 → Sun, Sep 27 3 nights

UA United 11% below typical

$177 Check this weekend →

Cheapest weekend

Sat, Oct 3 → Tue, Oct 6 3 nights

AS Alaska 41% below typical

$117 Check this weekend →

Fri, Oct 9 → Mon, Oct 12 3 nights

UA United · returns Delta

$223 Check this weekend →

Sat, Oct 17 → Tue, Oct 20 3 nights

UA United 41% below typical

$117 Check this weekend →

Sat, Oct 24 → Tue, Oct 27 3 nights

UA United 41% below typical

$117 Check this weekend →

Fri, Oct 30 → Mon, Nov 2 3 nights

UA United 32% below typical

$134 Check this weekend →

Sat, Nov 7 → Tue, Nov 10 3 nights

UA United 41% below typical

$117 Check this weekend →

Sat, Nov 14 → Tue, Nov 17 3 nights

UA United 41% below typical

$117 Check this weekend →

Fri, Nov 20 → Mon, Nov 23 3 nights

UA United

$207 Check this weekend →

Thu, Nov 26 → Sun, Nov 29 3 nights

AS Alaska · returns United

$400 Check this weekend →

Prices are the cheapest nonstop round-trip we found for each weekend, checked within the last 14 days. Fares move — "Check this weekend" re-prices the exact dates live.