$502 Cheap Flights from Seattle (SEA) to Santander (SDR)

View $502 flight on Mon, Mar 2, 2026Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Santander (SDR)

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Cheap Flights from Seattle to Santander (SEA-SDR)

Prices were available within the past 7 days and start at $502 for one-way flights and $659 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Iberia
Mon, Sep 22 - Mon, Sep 29
SEA
Seattle
SDR
Santander
$659 Roundtrip, found 3 days ago
$659
Roundtrip
found 3 days ago
Select Iberia flight, departing Mon, Sep 22 from Seattle to Santander, returning Mon, Sep 29, priced at $659 found 3 days ago
American Airlines
Sun, Nov 23 - Thu, Dec 4
SEA
Seattle
SDR
Santander
$708 Roundtrip, found 3 days ago
$708
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sun, Nov 23 from Seattle to Santander, returning Thu, Dec 4, priced at $708 found 3 days ago
Iberia
Mon, Sep 22 - Mon, Sep 29
SEA
Seattle
SDR
Santander
$740 Roundtrip, found 3 days ago
$740
Roundtrip
found 3 days ago
Select Iberia flight, departing Mon, Sep 22 from Seattle to Santander, returning Mon, Sep 29, priced at $740 found 3 days ago
Iberia
Mon, Sep 22 - Mon, Sep 29
SEA
Seattle
SDR
Santander
$747 Roundtrip, found 3 days ago
$747
Roundtrip
found 3 days ago
Select Iberia flight, departing Mon, Sep 22 from Seattle to Santander, returning Mon, Sep 29, priced at $747 found 3 days ago
Iberia
Mon, Sep 22 - Mon, Sep 29
SEA
Seattle
SDR
Santander
$752 Roundtrip, found 3 days ago
$752
Roundtrip
found 3 days ago
Select Iberia flight, departing Mon, Sep 22 from Seattle to Santander, returning Mon, Sep 29, priced at $752 found 3 days ago
American Airlines
Sun, Nov 23 - Wed, Dec 3
SEA
Seattle
SDR
Santander
$795 Roundtrip, found 1 day ago
$795
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sun, Nov 23 from Seattle to Santander, returning Wed, Dec 3, priced at $795 found 1 day ago
Iberia
Mon, Sep 22 - Mon, Sep 29
SEA
Seattle
SDR
Santander
$817 Roundtrip, found 3 days ago
$817
Roundtrip
found 3 days ago
Select Iberia flight, departing Mon, Sep 22 from Seattle to Santander, returning Mon, Sep 29, priced at $817 found 3 days ago
Iberia
Sun, Oct 19 - Sat, Oct 25
SEA
Seattle
SDR
Santander
$824 Roundtrip, found 4 days ago
$824
Roundtrip
found 4 days ago
Select Iberia flight, departing Sun, Oct 19 from Seattle to Santander, returning Sat, Oct 25, priced at $824 found 4 days ago
British Airways
Fri, Nov 21 - Thu, Dec 4
SEA
Seattle
SDR
Santander
$847 Roundtrip, found 3 days ago
$847
Roundtrip
found 3 days ago
Select British Airways flight, departing Fri, Nov 21 from Seattle to Santander, returning Thu, Dec 4, priced at $847 found 3 days ago
Alaska Airlines
Mon, Mar 2 - Mon, Mar 16
SEA
Seattle
SDR
Santander
$890 Roundtrip, found 3 days ago
$890
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Mon, Mar 2 from Seattle to Santander, returning Mon, Mar 16, priced at $890 found 3 days ago
Flights from Seattle (SEA) to Santander (SDR)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Santander
Airlines serving
Iberia
Roundtrip price
$658
Distance
5127 mi

Seattle to Santander Flights

The cheapest times to fly from Seattle to Santander

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

 

The best time to book a flight from Seattle to Santander

Sunday is one of the best days to book for cheap flights from Seattle to Santander: 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 Seattle to Santander

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 Seattle to Santander in 2025. You can also book with separate airlines for your outbound and return journeys, from $502 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 Seattle to Santander 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 Seattle to Santander 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 Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR) cost?
Get a cheap one-way flight from $502 or cheap return flight from $659 from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR)?
September is the cheapest month to fly from SEA to SDR. Traveling during an off-peak travel window is often the key to finding a great deal.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Tailor the search to your trip, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SEA to SDR flight.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR)?
There aren't any daily nonstop flights available from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR). But you can choose flights with layovers. Filter your search on Expedia to include one or two stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from SEA to SDR?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Keep in mind that flight schedules can change depending on various factors, such as the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR)?
Choose a flight from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR) that takes off before 3 PM to reduce the risk of delays and cancellations. Later departures are on average 22% more likely to be canceled.**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 Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR) last-minute?
Waiting until right before your break to book a flight from SEA to SDR often results in higher prices. While it's possible to find some last-minute discounts, there's no guarantee. Be flexible with your itinerary to maximize your chances of scoring a bargain.
Is it cheaper to book a SEA to SDR flight and hotel package?
You can save money by securing a SEA to SDR flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one place. Once you've selected your preferred accommodations and flights, consider adding extras including activities, car rentals and tours.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Santander Airport (SDR)?
If you booked your SEA to SDR flight in the last 24 hours, you may be able to modify or cancel it without fees. Depending on the airline and the type of fare you have, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, visit our Customer Service portal for more information.

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*Available to One Key members.