Cheap flights from Seattle to San Diego
Recently found return fares from $113, with December the cheapest month we know of. Compare dates, then book with the partner you choose.
Cheapest months to fly
Lowest recently found return fare in each month. Tap a month to see that month's calendar.
Seattle → San Diego
November 2026
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LowerHigherLowest this month
Lowest fares for the best day
- Frontier AirlinesWed 25 Nov – Sun 29 Nov · 1 stop · 4h 10m $187
- Frontier AirlinesFri 6 Nov – Tue 10 Nov · 1 stop · 5h 16m $270
- Alaska AirlinesSun 22 Nov – Sat 28 Nov · Direct · 2h 48m $331
- Frontier AirlinesSat 21 Nov – Sat 28 Nov · 1 stop · 5h 16m $337
Airport in San Diego
- SANSan Diego International
Airport in Seattle
- SEASeattle-Tacoma
Watch this route
FAQ
Questions about this route
Still have a question?
Search the help center or send us a message. We reply by email.
Help center Contact us01What is the cheapest month to fly from Seattle to San Diego?
Based on recently found fares, December 2026 has the lowest price we know of, from $113. Prices change often, so check the calendar for current fares.
02Are the prices on this page final?
No. They are recently found fares. When you open a deal, the partner shows the live price, including taxes and fees, before you pay.
03How can I get an alert when flights to San Diego get cheaper?
Use the price alert on this page. Choose your dates or a whole month and we will email you when the fare drops.