$149 Cheap United flights Washington (DCA) to San Diego (SAN)

View $149 flight on Wed, Sep 17, 2025Opens in a new window

$149 Cheap United flights Washington (DCA) to San Diego (SAN)

Prices were available within the past 7 days and start at $149 for one-way flights and $257 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 29 - Wed, Nov 5
DCA
Washington
SAN
San Diego
$257 Roundtrip, found 1 hour ago
$257
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Oct 29 from Washington to San Diego, returning Wed, Nov 5, priced at $257 found 1 hour ago
United
Sat, Sep 27 - Wed, Oct 1
DCA
Washington
SAN
San Diego
$284 Roundtrip, found 21 hours ago
$284
Roundtrip
found 21 hours ago
Select United flight, departing Sat, Sep 27 from Washington to San Diego, returning Wed, Oct 1, priced at $284 found 21 hours ago
United
Wed, Oct 29 - Wed, Nov 5
DCA
Washington
SAN
San Diego
$285 Roundtrip, found 1 hour ago
$285
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Oct 29 from Washington to San Diego, returning Wed, Nov 5, priced at $285 found 1 hour ago
United
Wed, Oct 29 - Wed, Nov 5
DCA
Washington
SAN
San Diego
$288 Roundtrip, found 1 hour ago
$288
Roundtrip
found 1 hour ago
Select United flight, departing Wed, Oct 29 from Washington to San Diego, returning Wed, Nov 5, priced at $288 found 1 hour ago
Flights from Washington (DCA) to San Diego (SAN)
Origin airport
Ronald Reagan Washington National
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, JetBlue Airways, Southwest Airlines, United
Popular airline
Alaska Airlines
Distance
2271 mi
Average flight time
3 hours 57 mins

Frequently asked questions

How much is a United Airlines flight from Ronald Reagan Washington National Airport (DCA) to San Diego Intl. Airport (SAN)?
You'll find affordable round-trip United Airlines flights from $257 from DCA to SAN by filtering your results from "Price (lowest to highest)" on Expedia. Or look for bargains from $149 for a one-way journey.**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 DCA to SAN with United Airlines?
United Airlines flights to San Diego are often more affordable in the low-season months of January and November. Whether you're after a round-trip or one-way ticket, you could find a better deal then.
What is the cheapest time to book flights from Ronald Reagan Washington National Airport (DCA) to San Diego Intl. Airport (SAN) with United Airlines?
Start searching one to three months before your departure to score cheap fares on United Airlines flights from Ronald Reagan Washington National Airport (DCA) to San Diego Intl. Airport (SAN). You can save 25% by booking your domestic flight 34 to 86 days in advance compared to last-minute reservations made 6 to 12 days out. You could also reduce costs by buying your fare on a Sunday, as it's 6% cheaper on average than a Monday, the most expensive day to book.* Time it well, and you can enjoy significant savings on domestic journeys.*Ideal booking window recommendation is based on average round-trip ticket prices for January through November for 2024. Best day of the week to book recommendation is based on average round-trip ticket prices for January through October 2024. All data sourced from ARC's global airline sales database.
Does United Airlines fly nonstop from Ronald Reagan Washington National Airport (DCA) to San Diego Intl. Airport (SAN)?
To figure out if there's a direct trip from DCA to SAN with United Airlines or other airlines, select the "Nonstop" filter when searching for tickets.
What is the earliest United Airlines flight from DCA to SAN?
Browse United Airlines's earliest flights from DCA to SAN by checking our "Morning" and "Early Morning" filters. Not only will you get to your destination sooner, early departures also experience 20% fewer cancellations.**Most reliable time of the day recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports does United Airlines fly into in San Diego?
San Diego Intl. Airport (SAN) is the primary San Diego gateway for United Airlines flights from Ronald Reagan Washington National Airport (DCA).
Why fly with United Airlines from DCA to SAN?
Travel from DCA to SAN with United Airlines and look forward to a range of benefits including a rewarding loyalty program. When you book through Expedia as a United Mileage Plus and One Key™ member, you may also earn OneKeyCash™* to redeem on select future travel purchases.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
Can I change or cancel my United Airlines flight from Ronald Reagan Washington National Airport (DCA) to San Diego Intl. Airport (SAN)?
Depending on the type of ticket you purchased, a fee will generally apply if you cancel or reschedule your booking more than 24 hours after it has been confirmed. To secure flexible fares, select our "Changes included" and "No cancel fee" boxes while searching for flights. For more details on modifying or canceling your reservation, visit "Trips," select your flight and tick "Manage Booking."

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*Available to One Key members.