$139 Cheap United flights San Diego (SAN) to Washington (IAD)

View $139 flight on Wed, Oct 15, 2025Opens in a new window

$139 Cheap United flights San Diego (SAN) to Washington (IAD)

Prices were available within the past 7 days and start at $139 for one-way flights and $237 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Oct 29 - Sat, Nov 8
SAN
San Diego
IAD
Washington
$237 Roundtrip, found 7 hours ago
$237
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 29 from San Diego to Washington, returning Sat, Nov 8, priced at $237 found 7 hours ago
United
Tue, Aug 26 - Tue, Nov 4
SAN
San Diego
IAD
Washington
$244 Roundtrip, found 1 day ago
$244
Roundtrip
found 1 day ago
Select United flight, departing Tue, Aug 26 from San Diego to Washington, returning Tue, Nov 4, priced at $244 found 1 day ago
United
Wed, Oct 29 - Sat, Nov 8
SAN
San Diego
IAD
Washington
$247 Roundtrip, found 7 hours ago
$247
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Oct 29 from San Diego to Washington, returning Sat, Nov 8, priced at $247 found 7 hours ago
United
Wed, Sep 17 - Sat, Sep 27
SAN
San Diego
IAD
Washington
$254 Roundtrip, found 7 hours ago
$254
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Sep 17 from San Diego to Washington, returning Sat, Sep 27, priced at $254 found 7 hours ago
United
Wed, Aug 27 - Sat, Sep 6
SAN
San Diego
IAD
Washington
$259 Roundtrip, found 7 hours ago
$259
Roundtrip
found 7 hours ago
Select United flight, departing Wed, Aug 27 from San Diego to Washington, returning Sat, Sep 6, priced at $259 found 7 hours ago
United
Fri, Oct 31 - Sat, Nov 1
SAN
San Diego
IAD
Washington
$262 Roundtrip, found 3 hours ago
$262
Roundtrip
found 3 hours ago
Select United flight, departing Fri, Oct 31 from San Diego to Washington, returning Sat, Nov 1, priced at $262 found 3 hours ago
Flights from San Diego (SAN) to Washington (IAD)
Origin airport
San Diego Intl.
Destination airport
Washington Dulles 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
9 hours 45 mins

Frequently asked questions

How much is a United Airlines flight from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
You'll discover affordable round-trip United Airlines flights from $237 from SAN to IAD by filtering your results from "Price (lowest to highest)" on Expedia. Or search for bargains from $139 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 SAN to IAD with United Airlines?
United Airlines flights to Washington are often more affordable in the quieter months of January and February. Whether you're searching for a one-way or round-trip ticket, you could find a better deal then.
What is the cheapest time to book flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) with United Airlines?
To find cheap United Airlines fares from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD), start searching one to three months before your intended 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 cost. Sunday is generally the most affordable, while Monday is often the most expensive for domestic flights. You can save 6% on average by choosing to book 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 San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
Yes, you can fly from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) on any of United Airlines's 21 weekly direct flights. Use our "Nonstop" and "Airline" filters to find the United Airlines flight that'll get you to IAD at your preferred time.
How long does it take to fly from SAN to IAD with United Airlines?
Take off from San Diego Intl. Airport (SAN) for Washington Dulles Intl. Airport (IAD) on a nonstop United Airlines flight, and you'll be airborne for approximately 4h 47m.
Which day of the week has the most United Airlines flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
Friday has the most United Airlines flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD). With 3 daily departures, this is the best day to find something that will suit your plans.
What is the earliest United Airlines flight from SAN to IAD?
The first flight from SAN to IAD with United Airlines leaves at 8:15AM UTC-8. You'll land at 3:58PM UTC-5. The final United Airlines flight of the day takes off at 9:30PM UTC-8 and arrives at 5:15AM UTC-5. With 20% fewer cancellations for departures before noon, heading out early is often the wisest option.**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 Washington?
United Airlines flights from San Diego Intl. Airport (SAN) to Washington land at Washington Dulles Intl. Airport (IAD) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI). The primary Washington gateway served by this carrier is IAD. It's always worth exploring flights landing at nearby airports on Expedia as they may have lower prices.
Why fly with United Airlines from SAN to IAD?
A rewarding loyalty program and the chance to rack up points through United Mileage Plus are the start of the reasons to travel from SAN to IAD with United Airlines. Plus, by joining Expedia's free One Key™ program, you can earn OneKeyCash™* in addition to any airline loyalty program earnings. It's yours to spend on future bookings.*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 San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
United Airlines typically flies Boeing 737-900 planes for flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD). This airline also operates the Boeing 777 on this route. Remember that aircraft type can change due to operational needs, so the plane you catch might be different on your travel date.
Can I change or cancel my United Airlines flight from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
Depending on your fare type, a fee will generally apply if you cancel or reschedule your flight more than 24 hours after it's confirmed. To secure flexible plane tickets, select our "Changes included" or "No cancel fee" filter when you search for flights. For additional information on canceling or changing your reservation, visit "Trips," select your flight and tick "Manage Booking."

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