$104 Cheap Flights from San Diego (SAN) to Washington (IAD)

View $104 flight on Sat, May 31, 2025Opens in a new window
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Cheap Flights from San Diego to Washington (SAN-IAD)

Prices were available within the past 7 days and start at $104 for one-way flights and $193 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Fri, May 30 - Sat, May 31
SAN
San Diego
IAD
Washington
$193 Roundtrip, found 14 hours ago
$193
Roundtrip
found 14 hours ago
Select Frontier Airlines flight, departing Fri, May 30 from San Diego to Washington, returning Sat, May 31, priced at $193 found 14 hours ago
Frontier Airlines
Sat, May 31 - Fri, Jun 6
SAN
San Diego
IAD
Washington
$198 Roundtrip, found 9 hours ago
$198
Roundtrip
found 9 hours ago
Select Frontier Airlines flight, departing Sat, May 31 from San Diego to Washington, returning Fri, Jun 6, priced at $198 found 9 hours ago
Frontier Airlines
Sat, May 24 - Sat, May 31
SAN
San Diego
IAD
Washington
$208 Roundtrip, found 4 hours ago
$208
Roundtrip
found 4 hours ago
Select Frontier Airlines flight, departing Sat, May 24 from San Diego to Washington, returning Sat, May 31, priced at $208 found 4 hours ago
Alaska Airlines
Tue, May 20 - Wed, May 28
SAN
San Diego
IAD
Washington
$213 Roundtrip, found 7 hours ago
$213
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Tue, May 20 from San Diego to Washington, returning Wed, May 28, priced at $213 found 7 hours ago
United
Wed, May 21 - Wed, May 28
SAN
San Diego
IAD
Washington
$218 Roundtrip, found 9 hours ago
$218
Roundtrip
found 9 hours ago
Select United flight, departing Wed, May 21 from San Diego to Washington, returning Wed, May 28, priced at $218 found 9 hours ago
Alaska Airlines
Tue, May 20 - Wed, May 28
SAN
San Diego
IAD
Washington
$222 Roundtrip, found 7 hours ago
$222
Roundtrip
found 7 hours ago
Select Alaska Airlines flight, departing Tue, May 20 from San Diego to Washington, returning Wed, May 28, priced at $222 found 7 hours ago
United
Wed, May 21 - Sat, May 31
SAN
San Diego
IAD
Washington
$228 Roundtrip, found 3 hours ago
$228
Roundtrip
found 3 hours ago
Select United flight, departing Wed, May 21 from San Diego to Washington, returning Sat, May 31, priced at $228 found 3 hours ago
Alaska Airlines
Wed, May 21 - Sat, May 31
SAN
San Diego
IAD
Washington
$232 Roundtrip, found 3 hours ago
$232
Roundtrip
found 3 hours ago
Select Alaska Airlines flight, departing Wed, May 21 from San Diego to Washington, returning Sat, May 31, priced at $232 found 3 hours ago
American Airlines
Sat, May 31 - Tue, Jun 10
SAN
San Diego
IAD
Washington
$256 Roundtrip, found 3 hours ago
$256
Roundtrip
found 3 hours ago
Select American Airlines flight, departing Sat, May 31 from San Diego to Washington, returning Tue, Jun 10, priced at $256 found 3 hours ago
Delta
Sat, Jun 7 - Tue, Jun 17
SAN
San Diego
IAD
Washington
$277 Roundtrip, found 3 hours ago
$277
Roundtrip
found 3 hours ago
Select Delta flight, departing Sat, Jun 7 from San Diego to Washington, returning Tue, Jun 17, priced at $277 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
Roundtrip price
$192
Distance
2249 mi

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 May. 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 $104 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?
Grab cheap return tickets starting from $234 from San Diego Intl. Airport (SAN) to Washington Dulles Intl. Airport (IAD). This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Alaska Airlines flight leaving SAN on May 17 2025 and touching down at IAD. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from SAN to IAD?
The cheapest flights from SAN to IAD are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
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 to IAD?
Travel from SAN to IAD with Alaska Airlines. This carrier currently has the cheapest one-way fare for this route, starting from $119. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from SAN on June 14 2025. Prices were last updated on April 24 2025 and have not changed since.
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.