Cheap flights from Seattle to San Francisco
The cheapest round trip from Seattle to San Francisco that travelers found recently is $155 with a carry-on: a $155 fare on Alaska Airlines, which usually includes a carry-on. It leaves Mon, Feb 1 and comes back Thu, Feb 4.
Live prices for Mon, Feb 1 to Thu, Feb 4
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Mon, Feb 1 | Thu, Feb 4 | Alaska Airlines | SEA → SFO | Nonstop | $155 | Included | $155 | Live price |
| Sun, Nov 1 | Wed, Nov 4 | Frontier | SEA → SFO | 1 stop | $208 | +$110 | $318 | Live price |
| Sat, May 1 | Tue, May 4 | Alaska Airlines | SEA → SFO | Nonstop | $328 | Included | $328 | Live price |
| Thu, Jul 1 | Sun, Jul 4 | Alaska Airlines | SEA → OAK | Nonstop | $328 | Included | $328 | Live price |
| Tue, Jun 1 | Fri, Jun 4 | Alaska Airlines | SEA → SFO | Nonstop | $330 | Included | $330 | Live price |
| Thu, Apr 1 | Sun, Apr 4 | Alaska Airlines | SEA → SJC | 1 stop | $342 | Included | $342 | Live price |
| Fri, Oct 16 | Fri, Oct 23 | Frontier | SEA → SFO | 1 stop | $440 | +$110 | $550 | 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 |
|---|---|---|---|
| October 2026 | Fri, Oct 16 to Fri, Oct 23, 7 nights | $550 | Live price |
| November 2026 | Sun, Nov 1 to Wed, Nov 4, 3 nights | $318 | Live price |
| February 2027 | Mon, Feb 1 to Thu, Feb 4, 3 nights | $155 | Live price |
| April 2027 | Thu, Apr 1 to Sun, Apr 4, 3 nights | $342 | Live price |
| May 2027 | Sat, May 1 to Tue, May 4, 3 nights | $328 | Live price |
| June 2027 | Tue, Jun 1 to Fri, Jun 4, 3 nights | $330 | Live price |
Bag fees on this route
What the airlines flying Seattle to San Francisco 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 |
| Frontier | $55 | $50 |
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).
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