Cheap flights from Seattle to San Diego
The cheapest round trip from Seattle to San Diego that travelers found recently is $172 with a carry-on: a $172 fare on Southwest, which usually includes a carry-on. It leaves Fri, Jan 15 and comes back Tue, Jan 19.
Live prices for Fri, Jan 15 to Tue, Jan 19
Cheapest trips travelers found recently
| Leave | Return | Airline | Airports | Stops | Fare | Carry-on (est.) | Total | Live prices |
|---|---|---|---|---|---|---|---|---|
| Fri, Jan 15 | Tue, Jan 19 | Southwest | SEA → SAN | Nonstop | $172 | Included | $172 | Live price |
| Fri, Jan 15 | Mon, Jan 18 | Southwest | SEA → SAN | Nonstop | $184 | Included | $184 | Live price |
| Mon, Dec 21 | Fri, Dec 25 | Southwest | SEA → SAN | 1 stop | $218 | Included | $218 | Live price |
| Fri, Nov 6 | Mon, Nov 9 | Frontier | SEA → SAN | 1 stop | $165 | +$110 | $275 | Live price |
| Fri, Nov 6 | Tue, Nov 10 | Frontier | SEA → SAN | 1 stop | $165 | +$110 | $275 | Live price |
| Fri, Oct 16 | Mon, Oct 19 | Frontier | SEA → SAN | 1 stop | $286 | +$110 | $396 | Live price |
| Wed, Oct 21 | Sun, Oct 25 | Frontier | SEA → SAN | 1 stop | $394 | +$110 | $504 | Live price |
| Thu, Oct 22 | Sun, Oct 25 | Frontier | SEA → SAN | 1 stop | $497 | +$110 | $607 | 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 Mon, Oct 19, 3 nights | $396 | Live price |
| November 2026 | Fri, Nov 6 to Mon, Nov 9, 3 nights | $275 | Live price |
| December 2026 | Mon, Dec 21 to Fri, Dec 25, 4 nights | $218 | Live price |
| January 2027 | Fri, Jan 15 to Tue, Jan 19, 4 nights | $172 | Live price |
Bag fees on this route
What the airlines flying Seattle to San Diego 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 |
|---|---|---|
| Frontier | $55 | $50 |
| 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).
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