United Cheap Flights from Washington to San Diego

View €198 flight on Mon, 13 Jul 2026Opens in a new window
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Prices were available within the past 7 days and start at €198 for one-way flights and €274 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, 6 Dec - Sat, 13 Dec
IAD
Washington
SAN
San Diego
€274 Return, found 6 days ago
€274
Return
found 6 days ago
Select United flight, departing Sat, 6 Dec from Washington to San Diego, returning Sat, 13 Dec, priced at €274 found 6 days ago
United
Sat, 6 Dec - Sat, 13 Dec
IAD
Washington
SAN
San Diego
€279 Return, found 6 days ago
€279
Return
found 6 days ago
Select United flight, departing Sat, 6 Dec from Washington to San Diego, returning Sat, 13 Dec, priced at €279 found 6 days ago
United
Sat, 6 Dec - Sat, 13 Dec
IAD
Washington
SAN
San Diego
€282 Return, found 6 days ago
€282
Return
found 6 days ago
Select United flight, departing Sat, 6 Dec from Washington to San Diego, returning Sat, 13 Dec, priced at €282 found 6 days ago
United
Sat, 6 Dec - Sat, 13 Dec
IAD
Washington
SAN
San Diego
€287 Return, found 6 days ago
€287
Return
found 6 days ago
Select United flight, departing Sat, 6 Dec from Washington to San Diego, returning Sat, 13 Dec, priced at €287 found 6 days ago
United
Sat, 6 Dec - Sat, 13 Dec
IAD
Washington
SAN
San Diego
€291 Return, found 6 days ago
€291
Return
found 6 days ago
Select United flight, departing Sat, 6 Dec from Washington to San Diego, returning Sat, 13 Dec, priced at €291 found 6 days ago
United
Sat, 6 Dec - Sat, 13 Dec
IAD
Washington
SAN
San Diego
€553 Return, found 6 days ago
€553
Return
found 6 days ago
Select United flight, departing Sat, 6 Dec from Washington to San Diego, returning Sat, 13 Dec, priced at €553 found 6 days ago
Washington to San Diego route information
Origin airport
Washington Dulles Intl.
Destination airport
San Diego Intl.
Distance
3598 km
Average flight time
3 hours 20 mins

Frequently asked questions

How much is a United Airlines flight from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
Scoring cheap one-way United Airlines flights from IAD to SAN from €198 on Expedia couldn't be easier — just filter by "Price (lowest to highest)." Alternatively, check out our budget-friendly round-trip fares from €274 for your next exciting getaway.**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 IAD to SAN with United Airlines?
Search for return or one-way flights to San Diego in January or November. You could find an affordable fare with United Airlines during these off-peak months.
Does United Airlines fly nonstop from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
Skip the layovers and fly from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN) on one of United Airlines's 21 weekly direct flights. Apply Expedia's "Nonstop" and "Airline" filters to find the United Airlines flight that'll get you to SAN at your preferred time.
How long does it take to fly from IAD to SAN with United Airlines?
On average, it takes 5h 37m to fly nonstop from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN) with United Airlines.
Which day of the week has the most United Airlines flights from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
United Airlines operates the most flights from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN) on Thursday. With up to 3 daily departures, you'll get the most choice and flexibility on this day.
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 Washington Dulles Intl. Airport (IAD).
What type of plane does United Airlines fly from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
You'll likely be on a Boeing 777 or a Boeing 737-900 when flying United Airlines from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN). However, keep in mind that a different plane could be assigned to your route depending on operational reasons.
Can I change or cancel my United Airlines flight from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
Changes are typically free within 24 hours of making your booking, but your airline may add a charge after that. For more details about altering your flights, go to your "Trips," select your flight and click on "Manage Booking." If you want the freedom to update your itinerary without being charged, tick the "Changes included" or "No cancel fee" filter when organising your next adventure.
*Available to Expedia members.