$119 Cheap United flights Washington (IAD) to San Diego (SAN)

View $119 flight on Sat, Sep 13, 2025Opens in a new window

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$119 Cheap United flights Washington (IAD) to San Diego (SAN)

Prices were available within the past 7 days and start at $119 for one-way flights and $237 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Sat, Sep 13 - Tue, Sep 23
IAD
Washington
SAN
San Diego
$237 Roundtrip, just found
$237
Roundtrip
just found
Select United flight, departing Sat, Sep 13 from Washington to San Diego, returning Tue, Sep 23, priced at $237 just found
United
Sat, Sep 13 - Tue, Sep 23
IAD
Washington
SAN
San Diego
$239 Roundtrip, just found
$239
Roundtrip
just found
Select United flight, departing Sat, Sep 13 from Washington to San Diego, returning Tue, Sep 23, priced at $239 just found
United
Sat, Aug 16 - Tue, Aug 26
IAD
Washington
SAN
San Diego
$240 Roundtrip, just found
$240
Roundtrip
just found
Select United flight, departing Sat, Aug 16 from Washington to San Diego, returning Tue, Aug 26, priced at $240 just found
United
Sat, Sep 6 - Tue, Sep 16
IAD
Washington
SAN
San Diego
$243 Roundtrip, just found
$243
Roundtrip
just found
Select United flight, departing Sat, Sep 6 from Washington to San Diego, returning Tue, Sep 16, priced at $243 just found
United
Sat, Sep 6 - Tue, Sep 16
IAD
Washington
SAN
San Diego
$244 Roundtrip, just found
$244
Roundtrip
just found
Select United flight, departing Sat, Sep 6 from Washington to San Diego, returning Tue, Sep 16, priced at $244 just found
United
Sat, Sep 13 - Tue, Sep 23
IAD
Washington
SAN
San Diego
$247 Roundtrip, just found
$247
Roundtrip
just found
Select United flight, departing Sat, Sep 13 from Washington to San Diego, returning Tue, Sep 23, priced at $247 just found
Flights from Washington (IAD) to San Diego (SAN)
Origin airport
Washington Dulles Intl.
Destination airport
San Diego Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, Sun Country Airlines, United
Popular airline
Alaska Airlines
Distance
2249 mi
Average flight time
2 hours 21 mins

Frequently asked questions

How much is a United Airlines flight from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
You can discover affordable round-trip United Airlines flights from $237 from IAD to SAN by organizing your results from "Price (lowest to highest)" on Expedia. Or look for deals from $119 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 IAD to SAN with United Airlines?
United Airlines flights to San Diego are typically more affordable in the off-peak months of January and November. Whether you're after a one-way or round-trip ticket, you could land a better deal then.
What is the cheapest time to book flights from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN) with United Airlines?
To find cheap United Airlines fares from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN), start searching one to three months before your planned departure. Securing domestic flights 34 to 86 days in advance could save you 25% compared to booking just 6 to 12 days ahead. The day you book can also impact the overall price. Sunday tends to be the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by booking on a Sunday.**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 Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
United Airlines has direct flights from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN), with 21 departures each week. Simply apply the "Nonstop" and "Airline" filters during your search on Expedia to show all direct United Airlines flights to SAN.
How long does it take to fly from IAD to SAN with United Airlines?
Take off from Washington Dulles Intl. Airport (IAD) for San Diego Intl. Airport (SAN) on a direct United Airlines flight, and you'll be airborne for approximately 5h 37m.
Which day of the week has the most United Airlines flights from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
If it's flexibility you're after, Thursday offers the most choice for United Airlines flights from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN). You can select from 3 different departures.
What is the earliest United Airlines flight from IAD to SAN?
The earliest flight from IAD to SAN with United Airlines leaves at 8:15AM UTC-5. You'll land at 10:57AM UTC-8. The final United Airlines flight of the day leaves at 6:20PM UTC-5 and arrives at 8:52PM UTC-8. With around 20% fewer cancellations for departures before noon, jetting out early is often the smartest choice.**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 main San Diego gateway for United Airlines flights from Washington Dulles Intl. Airport (IAD).
Why fly with United Airlines from IAD to SAN?
Offering a rewarding loyalty program, United Airlines is a popular choice for many travelers flying from IAD to SAN. Plus, as a United Mileage Plus and One Key™ member booking through Expedia, you can earn OneKeyCash™* on eligible flights along with your airline miles.*OneKeyCash™ disclaimer - OneKeyCash™ is not redeemable for cash and can only be used on Expedia, Hotels.com and Vrbo.
What type of plane does United Airlines fly from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
For the Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN) route, United Airlines typically flies Boeing 777 and Boeing 737-900 planes. Remember that last-minute changes can occur for operational purposes, meaning your flight may be on a different aircraft.
Can I change or cancel my United Airlines flight from Washington Dulles Intl. Airport (IAD) to San Diego Intl. Airport (SAN)?
In most cases, you can reschedule or cancel your flight, although additional fees may apply if you made your booking more than 24 hours ago. Need flexible options? Make use of Expedia's "Changes included" or "No cancel fee" filter to find flights that won't penalize you if you have to alter your plans. To modify your booking, go to "Trips," select your flight and click on "Manage Booking" for further information.

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*Available to One Key members.