￥20,020 Cheap United flights Seattle (SEA) to San Diego (SAN)

View ￥20,020 flight on Wed, Feb 25, 2026Opens in a new window
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￥20,020 Cheap United flights Seattle (SEA) to San Diego (SAN)

Prices were available within the past 7 days and start at ￥20,020 for one-way flights and ￥40,310 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Jan 8 - Wed, Jan 14
SEA
Seattle
SAN
San Diego
￥40,310 Roundtrip, found 4 days ago
￥40,310
Roundtrip
found 4 days ago
Select United flight, departing Thu, Jan 8 from Seattle to San Diego, returning Wed, Jan 14, priced at ￥40,310 found 4 days ago

Find the cheapest month to fly from Seattle (SEA) to San Diego (SAN)

January is typically the cheapest month to fly

From ￥13,545 - ￥24,435 per traveler.
Flights from Seattle (SEA) to San Diego (SAN)
Origin airport
Seattle - Tacoma Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United
Popular airline
Delta
Distance
1681 km
Average flight time
2 hours 50 mins

Frequently asked questions

How much is a United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to San Diego Intl. Airport (SAN)?
You'll discover cheap return United Airlines flights from ￥40,310 from SEA to SAN by organizing your results from "Price (lowest to highest)" on Expedia. Or look for options from ￥20,020 for a one-way trip.**These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.
What is the cheapest month to fly from SEA to SAN with United Airlines?
United Airlines flights to San Diego are often cheaper in the low-season months of January and November. Whether you're searching for a round-trip or one-way ticket, you could find a better deal then.
Does United Airlines fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to San Diego Intl. Airport (SAN)?
Use our "Nonstop" filter when browsing for direct United Airlines flights from SEA to SAN. It's also a good way to compare other carriers servicing the same nonstop trip.
What airports does United Airlines fly into in San Diego?
Jump on a United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to San Diego, and you'll probably land at San Diego Intl. Airport (SAN). This is the airline's primary hub in this city.
Can I change or cancel my United Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to San Diego Intl. Airport (SAN)?
Changes are usually free within 24 hours of booking, but your airline may charge a fee after that. For more details about altering your flights, head to your "Trips," select your flight and click on "Manage Booking." If you want the freedom to change your plans without additional costs, apply the "Changes included" and "No cancel fee" filters when planning your next break.

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*Available to Expedia members.