$159 Cheap United flights San Francisco (SFO) to Washington (IAD)

View $159 flight on Tue, Dec 2, 2025Opens in a new window

$159 Cheap United flights San Francisco (SFO) to Washington (IAD)

Prices were available within the past 7 days and start at $159 for one-way flights and $277 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Wed, Sep 10 - Tue, Sep 30
SFO
San Francisco
IAD
Washington
$277 Roundtrip, just found
$277
Roundtrip
just found
Select United flight, departing Wed, Sep 10 from San Francisco to Washington, returning Tue, Sep 30, priced at $277 just found
United
Fri, Oct 3 - Sat, Oct 4
SFO
San Francisco
IAD
Washington
$294 Roundtrip, found 9 hours ago
$294
Roundtrip
found 9 hours ago
Select United flight, departing Fri, Oct 3 from San Francisco to Washington, returning Sat, Oct 4, priced at $294 found 9 hours ago
United
Wed, Oct 8 - Sat, Oct 18
SFO
San Francisco
IAD
Washington
$295 Roundtrip, just found
$295
Roundtrip
just found
Select United flight, departing Wed, Oct 8 from San Francisco to Washington, returning Sat, Oct 18, priced at $295 just found
United
Wed, Oct 1 - Sat, Oct 11
SFO
San Francisco
IAD
Washington
$300 Roundtrip, just found
$300
Roundtrip
just found
Select United flight, departing Wed, Oct 1 from San Francisco to Washington, returning Sat, Oct 11, priced at $300 just found
United
Wed, Oct 29 - Sat, Nov 8
SFO
San Francisco
IAD
Washington
$305 Roundtrip, just found
$305
Roundtrip
just found
Select United flight, departing Wed, Oct 29 from San Francisco to Washington, returning Sat, Nov 8, priced at $305 just found
United
Tue, Oct 28 - Fri, Nov 7
SFO
San Francisco
IAD
Washington
$307 Roundtrip, just found
$307
Roundtrip
just found
Select United flight, departing Tue, Oct 28 from San Francisco to Washington, returning Fri, Nov 7, priced at $307 just found
Flights from San Francisco (SFO) to Washington (IAD)
Origin airport
San Francisco 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
2413 mi
Average flight time
8 hours 36 mins

Frequently asked questions

How much is a United Airlines flight from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD)?
Grab affordable round-trip United Airlines flights from $277 from SFO to IAD by filtering your results from "Price (lowest to highest)" on Expedia. Or search for options from $159 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 SFO to IAD with United Airlines?
Look for one-way or round-trip flights to Washington in January or February. You could find a cheap fare with United Airlines during these off-peak times.
What is the cheapest time to book flights from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD) with United Airlines?
Look for affordable United Airlines flights from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD) one to three months ahead of your departure. Travelers who book domestic flights 34 to 86 days in advance can save 25% compared to those who book just 6 to 12 days ahead. No matter the fare type and journey, the best day of the week to book a domestic flight is usually Sunday and the most expensive tends to be Monday. Passengers who book on a Sunday can save 6% on average compared to those who book their travel on a Monday.**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 Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD)?
United Airlines operates direct flights from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD), with 39 weekly departures. Just apply the "Nonstop" and "Airline" filters during your search on Expedia to show all direct United Airlines flights to IAD.
How long does it take to fly from SFO to IAD with United Airlines?
Take off from San Francisco Intl. Airport (SFO) for Washington Dulles Intl. Airport (IAD) on a nonstop United Airlines flight, and you'll be in the sky for around 5h 6m.
Which day of the week has the most United Airlines flights from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD)?
Thursday has the most United Airlines flights from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD). With 6 daily departures, this is the best day of the week to book something that will fit your plans.
What is the earliest United Airlines flight from SFO to IAD?
The earliest United Airlines flight from SFO to IAD takes off at 7:00AM UTC-8, landing at 3:06PM UTC-5. If you want to set off later in the day, the last United Airlines flight leaves SFO at 10:45PM UTC-8 and lands at IAD at 6:52AM UTC-5. Flying earlier is generally a smart option as morning flights tend to experience 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 Washington?
When traveling from San Francisco Intl. Airport (SFO) to Washington with United Airlines, you'll probably touch down at Washington Dulles Intl. Airport (IAD). This is the airline's primary hub in the city. Other nearby airports like Ronald Reagan Washington National Airport (DCA) and Baltimore Washington Intl. Thurgood Marshall Airport (BWI) may offer more affordable fares, so it's a good idea to check out all your options on Expedia.
Why fly with United Airlines from SFO to IAD?
With a rewarding loyalty program, United Airlines is a popular choice for many travelers flying from SFO to IAD. Plus, if you're a United Mileage Plus and One Key™ member booking through Expedia, you could earn OneKeyCash™* on eligible flights on top of 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 San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD)?
You'll likely be on a Boeing 737-900 or a Boeing 737 MAX 9 when flying United Airlines from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD). However, keep in mind that a different aircraft could be assigned to your route due to operational factors.
Can I change or cancel my United Airlines flight from San Francisco Intl. Airport (SFO) to Washington Dulles Intl. Airport (IAD)?
You can usually reschedule or cancel your flight, although there may be additional fees if you made your booking over 24 hours ago. Need to keep your options open? Make use of our "Changes included" and "No cancel fee" filters to find flights that won't charge you extra if you have to alter your plans. To update your booking, visit "Trips," select your flight and click on "Manage Booking" for further information.

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*Available to One Key members.