Cheap flights from San Francisco to Seattle
The cheapest round trip from San Francisco to Seattle that travelers found recently is $131 with a carry-on: a $131 fare on Alaska Airlines, which usually includes a carry-on. It leaves Sun, Nov 8 and comes back Sat, Nov 14.
Live prices for Sun, Nov 8 to Sat, Nov 14
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Sun, Nov 8 | Sat, Nov 14 | Alaska Airlines | SFO → SEA | Nonstop | $131 | Included | $131 | Live price |
| Sun, Nov 1 | Wed, Nov 4 | Alaska Airlines | SFO → SEA | Nonstop | $133 | Included | $133 | Live price |
| Mon, Feb 1 | Thu, Feb 4 | Alaska Airlines | SFO → SEA | Nonstop | $137 | Included | $137 | Live price |
| Mon, Mar 1 | Thu, Mar 4 | Alaska Airlines | SFO → SEA | Nonstop | $137 | Included | $137 | Live price |
| Fri, Jan 1 | Mon, Jan 4 | Southwest | OAK → SEA | Nonstop | $168 | Included | $168 | Live price |
| Sat, May 1 | Tue, May 4 | Alaska Airlines | SFO → SEA | Nonstop | $328 | Included | $328 | Live price |
| Tue, Jun 1 | Fri, Jun 4 | Alaska Airlines | OAK → SEA | Nonstop | $340 | Included | $340 | Live price |
| Thu, Apr 1 | Sun, Apr 4 | Alaska Airlines | SFO → SEA | Nonstop | $345 | Included | $345 | Live price |
Round-trip prices per person, from real fares travelers found in the last few days. Carry-on fees are our estimate for each airline, both ways. Prices change fast: check the live price before you book.
Cheapest month to fly
| Month | Cheapest trip | From | Live prices |
|---|---|---|---|
| November 2026 | Sun, Nov 8 to Sat, Nov 14, 6 nights | $131 | Live price |
| January 2027 | Fri, Jan 1 to Mon, Jan 4, 3 nights | $168 | Live price |
| February 2027 | Mon, Feb 1 to Thu, Feb 4, 3 nights | $137 | Live price |
| March 2027 | Mon, Mar 1 to Thu, Mar 4, 3 nights | $137 | Live price |
| April 2027 | Thu, Apr 1 to Sun, Apr 4, 3 nights | $345 | Live price |
| May 2027 | Sat, May 1 to Tue, May 4, 3 nights | $328 | Live price |
Bag fees on this route
What the airlines flying San Francisco to Seattle usually charge for one bag each way. Budget airlines often sell the cheapest fares and charge the most for bags, so compare the total, not the fare.
| Airline | Carry-on, each way | Checked bag, each way |
|---|---|---|
| Alaska Airlines | Included | $40 |
| Southwest | Included | $35 |
Our estimates: fees depend on the fare type and when you pay. Check the airline's own price when you book.
How these prices work
These are real round-trip fares that travelers found on Aviasales recently, not a live search, so they can change or sell out. Dipt adds an estimate of each airline's carry-on fee, so a cheap fare with expensive bags doesn't look cheaper than it is. "Live price" opens Dipt's live flight search for those dates, where you book with the airline or travel site you pick. Dipt may earn a commission when you book, at no extra cost to you (how Dipt makes money).
Not sure where to go? Tell Dipt your budget and vibe and it finds the trip.
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