$519 Cheap Flights from Washington (IAD) to San Sebastian (EAS)

View $519 flight on Thu, Jan 22, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to San Sebastian (EAS)

Cheap Flights from Washington to San Sebastian (IAD-EAS)

Prices were available within the past 7 days and start at $519 for one-way flights and $567 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Iberia
Wed, Sep 23 - Wed, Sep 30
IAD
Washington
EAS
San Sebastián
$567 Roundtrip, found 3 days ago
$567
Roundtrip
found 3 days ago
Select Iberia flight, departing Wed, Sep 23 from Washington to San Sebastián, returning Wed, Sep 30, priced at $567 found 3 days ago
Iberia
Wed, Sep 23 - Wed, Sep 30
IAD
Washington
EAS
San Sebastián
$578 Roundtrip, found 3 days ago
$578
Roundtrip
found 3 days ago
Select Iberia flight, departing Wed, Sep 23 from Washington to San Sebastián, returning Wed, Sep 30, priced at $578 found 3 days ago
Iberia
Tue, Dec 2 - Tue, Dec 9
IAD
Washington
EAS
San Sebastián
$582 Roundtrip, found 4 days ago
$582
Roundtrip
found 4 days ago
Select Iberia flight, departing Tue, Dec 2 from Washington to San Sebastián, returning Tue, Dec 9, priced at $582 found 4 days ago
Iberia
Sun, Dec 7 - Mon, Dec 22
IAD
Washington
EAS
San Sebastián
$586 Roundtrip, found 4 hours ago
$586
Roundtrip
found 4 hours ago
Select Iberia flight, departing Sun, Dec 7 from Washington to San Sebastián, returning Mon, Dec 22, priced at $586 found 4 hours ago
Iberia
Sun, Nov 30 - Sun, Dec 7
IAD
Washington
EAS
San Sebastián
$590 Roundtrip, found 4 days ago
$590
Roundtrip
found 4 days ago
Select Iberia flight, departing Sun, Nov 30 from Washington to San Sebastián, returning Sun, Dec 7, priced at $590 found 4 days ago
Iberia
Sun, Nov 30 - Sun, Dec 7
IAD
Washington
EAS
San Sebastián
$599 Roundtrip, found 4 days ago
$599
Roundtrip
found 4 days ago
Select Iberia flight, departing Sun, Nov 30 from Washington to San Sebastián, returning Sun, Dec 7, priced at $599 found 4 days ago
British Airways
Tue, Dec 2 - Wed, Dec 10
IAD
Washington
EAS
San Sebastián
$605 Roundtrip, found 13 hours ago
$605
Roundtrip
found 13 hours ago
Select British Airways flight, departing Tue, Dec 2 from Washington to San Sebastián, returning Wed, Dec 10, priced at $605 found 13 hours ago
Iberia
Tue, Aug 18 - Tue, Aug 25
IAD
Washington
EAS
San Sebastián
$616 Roundtrip, found 8 hours ago
$616
Roundtrip
found 8 hours ago
Select Iberia flight, departing Tue, Aug 18 from Washington to San Sebastián, returning Tue, Aug 25, priced at $616 found 8 hours ago
Iberia
Thu, Nov 27 - Thu, Dec 11
IAD
Washington
EAS
San Sebastián
$617 Roundtrip, found 1 day ago
$617
Roundtrip
found 1 day ago
Select Iberia flight, departing Thu, Nov 27 from Washington to San Sebastián, returning Thu, Dec 11, priced at $617 found 1 day ago
American Airlines
Thu, Dec 4 - Tue, Dec 9
IAD
Washington
EAS
San Sebastián
$650 Roundtrip, found 13 hours ago
$650
Roundtrip
found 13 hours ago
Select American Airlines flight, departing Thu, Dec 4 from Washington to San Sebastián, returning Tue, Dec 9, priced at $650 found 13 hours ago

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS) cost?
Snag a cheap one-way flight from $519 or cheap return flight from $567 from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS)?
Flying in September may help you find better deals, as it's the cheapest month for flights between IAD and EAS. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS)?
Expedia's filter tool lets you easily compare airlines, flight times and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest IAD to EAS flight.
How many flights per day from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS)?
You'll have to hop on a flight with a layover if you're traveling from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from IAD to EAS?
Friday is usually the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can change depending on a number of factors, such as the time of year and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS)?
To reach San Sebastian Airport (EAS) on time, opt for a flight that leaves from Washington Dulles Intl. Airport (IAD) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS) last-minute?
Waiting until just before your departure to book a flight from IAD to EAS generally means paying more. While you might find some last-minute deals, there's no guarantee. Allow some flexibility in your schedule for a better chance of scoring a bargain.
Is it cheaper to book an IAD to EAS flight and hotel package?
You'll generally save money by booking an IAD to EAS flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After selecting your ideal flights and accommodations, you can add extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to San Sebastian Airport (EAS)?
If you booked your IAD to EAS flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more information.

Travel information

Origin airport
Washington Dulles Intl.
Destination airport
San Sebastian
Airlines serving
American Airlines, Iberia
Roundtrip price
$567
Distance
3808 mi

Book with confidence

Washington to San Sebastian Flights

The cheapest times to fly from Washington to San Sebastian

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 Washington to San Sebastian are during the month of September. You can find some of the cheapest flights from Washington to San Sebastian with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Washington to San Sebastian: 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 Washington to San Sebastian

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 Washington to San Sebastian in 2025. You can also book with separate airlines for your outbound and return journeys, from $519 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 Washington to San Sebastian 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 Washington to San Sebastian 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.

 

Washington to San Sebastian Flights

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*Available to One Key members.