$503 Cheap Flights from Seattle (SEA) to Kosice (KSC)

View $503 flight on Wed, Jul 30, 2025Opens in a new window
Find available prices by choosing your travel dates.

Cheap Flights from Seattle to Kosice (SEA-KSC)

Prices were available within the past 7 days and start at $503 for one-way flights and $664 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Swiss International Air Lines
Mon, Aug 4 - Mon, Aug 18
SEA
Seattle
KSC
Kosice
$664 Roundtrip, found 22 hours ago
$664
Roundtrip
found 22 hours ago
Select Swiss International Air Lines flight, departing Mon, Aug 4 from Seattle to Kosice, returning Mon, Aug 18, priced at $664 found 22 hours ago
Swiss International Air Lines
Wed, Aug 6 - Mon, Aug 18
SEA
Seattle
KSC
Kosice
$669 Roundtrip, found 22 hours ago
$669
Roundtrip
found 22 hours ago
Select Swiss International Air Lines flight, departing Wed, Aug 6 from Seattle to Kosice, returning Mon, Aug 18, priced at $669 found 22 hours ago
United
Tue, Aug 5 - Wed, Aug 20
SEA
Seattle
KSC
Kosice
$671 Roundtrip, found 22 hours ago
$671
Roundtrip
found 22 hours ago
Select United flight, departing Tue, Aug 5 from Seattle to Kosice, returning Wed, Aug 20, priced at $671 found 22 hours ago
United
Tue, Aug 5 - Mon, Aug 18
SEA
Seattle
KSC
Kosice
$692 Roundtrip, found 22 hours ago
$692
Roundtrip
found 22 hours ago
Select United flight, departing Tue, Aug 5 from Seattle to Kosice, returning Mon, Aug 18, priced at $692 found 22 hours ago
Air Canada
Sun, Aug 10 - Mon, Aug 18
SEA
Seattle
KSC
Kosice
$695 Roundtrip, found 22 hours ago
$695
Roundtrip
found 22 hours ago
Select Air Canada flight, departing Sun, Aug 10 from Seattle to Kosice, returning Mon, Aug 18, priced at $695 found 22 hours ago
Lufthansa
Sun, Aug 10 - Wed, Aug 20
SEA
Seattle
KSC
Kosice
$712 Roundtrip, found 22 hours ago
$712
Roundtrip
found 22 hours ago
Select Lufthansa flight, departing Sun, Aug 10 from Seattle to Kosice, returning Wed, Aug 20, priced at $712 found 22 hours ago
United
Thu, Aug 7 - Wed, Aug 20
SEA
Seattle
KSC
Kosice
$721 Roundtrip, found 22 hours ago
$721
Roundtrip
found 22 hours ago
Select United flight, departing Thu, Aug 7 from Seattle to Kosice, returning Wed, Aug 20, priced at $721 found 22 hours ago
Lufthansa
Sun, Aug 10 - Tue, Aug 19
SEA
Seattle
KSC
Kosice
$733 Roundtrip, found 22 hours ago
$733
Roundtrip
found 22 hours ago
Select Lufthansa flight, departing Sun, Aug 10 from Seattle to Kosice, returning Tue, Aug 19, priced at $733 found 22 hours ago
United
Mon, Aug 25 - Tue, Sep 30
SEA
Seattle
KSC
Kosice
$756 Roundtrip, found 2 days ago
$756
Roundtrip
found 2 days ago
Select United flight, departing Mon, Aug 25 from Seattle to Kosice, returning Tue, Sep 30, priced at $756 found 2 days ago
Austrian Airlines
Wed, Aug 27 - Tue, Sep 30
SEA
Seattle
KSC
Kosice
$775 Roundtrip, found 2 days ago
$775
Roundtrip
found 2 days ago
Select Austrian Airlines flight, departing Wed, Aug 27 from Seattle to Kosice, returning Tue, Sep 30, priced at $775 found 2 days ago
Flights from Seattle (SEA) to Kosice (KSC)
Origin airport
Seattle - Tacoma Intl.
Destination airport
Barca
Airlines serving
Austrian Airlines, Lufthansa, Swiss International Air Lines
Roundtrip price
$664
Distance
5445 mi

Seattle to Kosice Flights

The cheapest times to fly from Seattle to Kosice

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

The best time to book a flight from Seattle to Kosice

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

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 Kosice in 2025. You can also book with separate airlines for your outbound and return journeys, from $503 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 Kosice 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 Kosice 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 Barca Airport (KSC) cost?
Discover the latest flight deals from SEA to KSC by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from SEA to KSC?
The cheapest flights from SEA to KSC are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from SEA to KSC?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that’ll take you from SEA to KSC. Sort your results by “Price (lowest to highest)” to snap up a great deal.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Barca Airport (KSC)?
Direct flights from Seattle - Tacoma Intl. Airport (SEA) to Barca Airport (KSC) aren’t available daily, so you’ll need to take a flight with a layover. Explore your options with Expedia’s filter tool. Enter your dates and pick either “1 Stop” or “2+ Stops.”
What day of the week has the most flights from SEA to KSC?
You’ll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during peak travel times or public holidays.*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 Barca Airport (KSC)?
To land at Barca Airport (KSC) on schedule, choose a flight that takes off from Seattle - Tacoma Intl. Airport (SEA) 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.
Is it cheaper to buy a plane ticket from Seattle - Tacoma Intl. Airport (SEA) to Barca Airport (KSC) last-minute?
Last-minute fares from SEA to KSC are usually more expensive. For the lowest rates, start looking for flights as soon as possible. That being said, if you can play around with your travel dates, you may find a cheap ticket just before your departure.
Is it cheaper to book a SEA to KSC flight and hotel package?
Compared with arranging hotels and flights separately, booking a SEA to KSC flight and hotel package with Expedia could lead to significant savings. Better yet, having it all in one place takes the hassle out of planning your trip. Just secure your flights and select from our wide range of stays, then customize your trip with other add-ons like tours, car rentals and activities.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Barca Airport (KSC)?
You can usually reschedule or cancel your SEA to KSC flight. However, if it’s been more than 24 hours since booking, additional fees may apply. Check your airline’s policies in your itinerary to see what changes are allowed and whether any costs are involved. You’ll also find more information on our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.