Open interactive map →Cheap flights from Seattle to San Diego
Planning a trip from Seattle to San Diego? Current fares start at €116 - a solid entry point for a flight to United States. Several airlines compete on this route, which helps keep fares relatively stable. Direct and one-stop options are both available - use the booking site to filter by preference. Use the price calendar to identify your cheapest month, then click through to compare live seat availability.
Price patterns on the Seattle to San Diego route tend to spike during school holidays and public holiday weekends. Booking 4-6 weeks out generally balances availability and price well on this route. If your travel dates are flexible, check the price calendar for the lowest-priced months before searching for specific flights.
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Cheapest month to fly
- October 2026€1161 stopCheapest
Based on tracked fares, October is the cheapest month to fly this route at around €116.
Prices last updated: September 2026
Entry requirements for United States
EU passportESTA required (visa-waiver)
US passportN/A (domestic)
Requirements vary by nationality and change without notice. Check requirements for your nationality →
Alternative routes
Other ways to reach San Diego
Frequently asked questions
How much does a flight from Seattle to San Diego cost?
The cheapest fare currently available from Seattle to San Diego is €116. Prices on this route vary by season, day of week, and how far in advance you book. The month-by-month price calendar on this page shows exactly when fares are highest and lowest, so you can pick the most cost-effective window before searching for specific dates. Fares are refreshed regularly as our flight partners publish new availability.
Are there direct flights from Seattle to San Diego?
SkyHopp tracks both direct and connecting flights from Seattle to San Diego. Connecting flights are often priced lower but add travel time due to the layover. Whether a non-stop option exists on specific dates depends on airline schedules - use the "Direct only" filter on the interactive map to see non-stop options, or check the booking site for a full breakdown by stop count.
When is the cheapest time to fly from Seattle to San Diego?
Prices on this route typically dip during shoulder-season months, away from school holidays and public holiday windows. Mid-week departures - particularly Tuesday to Thursday - tend to be cheaper than flights on Fridays and Sundays from Seattle. The month-by-month price calendar above is the fastest way to identify the cheapest window - look for the months with the lowest fares before committing to travel dates. Booking 3-6 weeks in advance generally offers the best balance of price and seat availability on this route.