$87 Cheap Flights from San Diego (SAN) to Washington (IAD)

View $87 flight on Wed, Jan 21, 2026Opens in a new window

Popular airlines from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)

Cheap Flights from San Diego to Washington (SAN-IAD)

Prices were available within the past 7 days and start at $87 for one-way flights and $174 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Tue, Jan 13 - Wed, Jan 21
SAN
San Diego
IAD
Washington
$174 Roundtrip, found 2 hours ago
$174
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Tue, Jan 13 from San Diego to Washington, returning Wed, Jan 21, priced at $174 found 2 hours ago
Southwest Airlines
Tue, Jan 13 - Wed, Jan 21
SAN
San Diego
IAD
Washington
$180 Roundtrip, found 2 hours ago
$180
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Tue, Jan 13 from San Diego to Washington, returning Wed, Jan 21, priced at $180 found 2 hours ago
Southwest Airlines
Tue, Dec 9 - Wed, Dec 10
SAN
San Diego
IAD
Washington
$185 Roundtrip, found 17 hours ago
$185
Roundtrip
found 17 hours ago
Select Southwest Airlines flight, departing Tue, Dec 9 from San Diego to Washington, returning Wed, Dec 10, priced at $185 found 17 hours ago
Southwest Airlines
Tue, Jan 20 - Wed, Jan 28
SAN
San Diego
IAD
Washington
$192 Roundtrip, found 2 hours ago
$192
Roundtrip
found 2 hours ago
Select Southwest Airlines flight, departing Tue, Jan 20 from San Diego to Washington, returning Wed, Jan 28, priced at $192 found 2 hours ago
Southwest Airlines
Tue, Jan 20 - Tue, Jan 27
SAN
San Diego
IAD
Washington
$198 Roundtrip, found 4 hours ago
$198
Roundtrip
found 4 hours ago
Select Southwest Airlines flight, departing Tue, Jan 20 from San Diego to Washington, returning Tue, Jan 27, priced at $198 found 4 hours ago
Southwest Airlines
Mon, Jan 12 - Wed, Jan 21
SAN
San Diego
IAD
Washington
$199 Roundtrip, just found
$199
Roundtrip
just found
Select Southwest Airlines flight, departing Mon, Jan 12 from San Diego to Washington, returning Wed, Jan 21, priced at $199 just found
American Airlines
Sat, Jan 31 - Sat, Feb 7
SAN
San Diego
IAD
Washington
$204 Roundtrip, found 7 hours ago
$204
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Sat, Jan 31 from San Diego to Washington, returning Sat, Feb 7, priced at $204 found 7 hours ago
Delta
Wed, Jan 7 - Wed, Jan 14
SAN
San Diego
IAD
Washington
$218 Roundtrip, found 4 hours ago
$218
Roundtrip
found 4 hours ago
Select Delta flight, departing Wed, Jan 7 from San Diego to Washington, returning Wed, Jan 14, priced at $218 found 4 hours ago
Alaska Airlines
Tue, Jan 6 - Wed, Jan 14
SAN
San Diego
IAD
Washington
$221 Roundtrip, found 2 hours ago
$221
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Tue, Jan 6 from San Diego to Washington, returning Wed, Jan 14, priced at $221 found 2 hours ago
United
Tue, Jan 20 - Wed, Jan 28
SAN
San Diego
IAD
Washington
$237 Roundtrip, found 2 hours ago
$237
Roundtrip
found 2 hours ago
Select United flight, departing Tue, Jan 20 from San Diego to Washington, returning Wed, Jan 28, priced at $237 found 2 hours ago

Find the cheapest month to fly from San Diego (SAN) to Washington (IAD)

September is typically the cheapest month to fly

From $174 - $246 per traveler.

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $277
DCA
Ronald Reagan Washington National
CheapestClosest
Average driving time to city center8 min
Flights from $277
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
Roundtrip price
$174
Distance
2249 mi
Average flight time
8 hours 49 mins

San Diego to Washington Flights

The cheapest times to fly from San Diego to Washington

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from San Diego to Washington are during the month of January. You can find some of the cheapest flights from San Diego to Washington with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from San Diego to Washington

Sunday is one of the best days to book for cheap flights from San Diego to Washington: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from San Diego to Washington

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from San Diego to Washington in 2025. You can also book with separate airlines for your outbound and return journeys, from $87 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap San Diego to Washington flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your San Diego to Washington airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) cost?
Get a cheap one-way flight from $87 or cheap return flight from $174 from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
The cheapest month to fly from SAN to IAD is January, when there's less demand. Off-peak season is usually when you'll find lower airfares between these airports.
Which airlines fly direct from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
When departing from San Diego Intl. Airport (SAN), you can hop on a nonstop flight to Washington Dulles Intl. Airport (IAD) with United Airlines.
What is the cheapest airline that flies from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
Alaska Airlines and United Airlines are well-known airlines offering competitive fares. Keep in mind that flight prices from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) can vary based on demand, seasonality and time of booking. With Expedia's filter tool, you can easily find a SAN to IAD flight that suits your plans and budget.
How many flights per day from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
With, on average, 4 nonstop flights that operate from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) each day, you'll be jetting off in no time.
What are the most popular departure times for flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
The 8 AM departures from SAN to IAD are typically the busiest. Greater demand means you'll likely pay more for these departures. If you want to save on your trip, choose a less crowded time to fly.
What day of the week has the most flights from SAN to IAD?
If you depart on a Sunday, you'll get the widest range of choices for flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD).
What is the earliest flight from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
Take the earliest flight at around 8:15AM UTC-8, departing from San Diego Intl. Airport (SAN). You'll be in the air for around 4h 43m, reaching Washington Dulles Intl. Airport (IAD) at approximately 3:58PM UTC-5.
How long does it take to fly from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
It takes around 4 hours and 49 minutes to travel the 2,300 mi from SAN to IAD.
What airline has the least delays from SAN to IAD?
With 90% of flights usually landing on schedule, United Airlines has the best on-time performance for direct flights from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD). To keep track of your flight status and get notifications about any changes, simply head to the Expedia App.
What is the best time to fly from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
To reach Washington Dulles Intl. Airport (IAD) without delays, select a flight that leaves from San Diego Intl. Airport (SAN) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Washington from San Diego Intl. Airport (SAN)?
You can arrive at Washington Dulles Intl. Airport (IAD) or Baltimore Washington Intl. Thurgood Marshall Airport (BWI) when you travel to Washington on a direct flight from San Diego Intl. Airport (SAN).
Is it cheaper to buy a plane ticket from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD) last-minute?
Waiting until just before your departure to book a ticket from SAN to IAD often results in higher prices. While you may find some last-minute deals, they aren't always guaranteed. Be flexible with your travel plans to boost your chances of snagging a bargain.
Is it cheaper to book a SAN to IAD flight and hotel package?
Compared with arranging hotels and flights separately, booking a SAN to IAD flight and hotel package with Expedia could lead to significant savings. Better still, having everything in one place will take the stress out of planning your trip. Just secure your flights and select from our extensive range of stays, then customize your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD)?
If you booked your SAN to IAD flight in the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the fare type you purchased, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

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*Available to One Key members.