$360 Cheap Flights from Seattle (SEA) to Sofia (SOF)

View $360 flight on Fri, Oct 17, 2025Opens in a new window

Popular airlines from Seattle-Tacoma International Airport (SEA) to Sofia Airport (SOF)

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Cheap Flights from Seattle to Sofia (SEA-SOF)

Prices were available within the past 7 days and start at $360 for one-way flights and $566 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Nov 4 - Mon, Nov 10
SEA
Seattle
SOF
Sofia
$566 Roundtrip, found 6 days ago
$566
Roundtrip
found 6 days ago
Select American Airlines flight, departing Tue, Nov 4 from Seattle to Sofia, returning Mon, Nov 10, priced at $566 found 6 days ago
British Airways
Tue, Nov 4 - Mon, Nov 10
SEA
Seattle
SOF
Sofia
$568 Roundtrip, found 6 days ago
$568
Roundtrip
found 6 days ago
Select British Airways flight, departing Tue, Nov 4 from Seattle to Sofia, returning Mon, Nov 10, priced at $568 found 6 days ago
Air Canada
Tue, Nov 25 - Thu, Dec 11
SEA
Seattle
SOF
Sofia
$571 Roundtrip, found 2 days ago
$571
Roundtrip
found 2 days ago
Select Air Canada flight, departing Tue, Nov 25 from Seattle to Sofia, returning Thu, Dec 11, priced at $571 found 2 days ago
Air Canada
Tue, Nov 11 - Wed, Nov 19
SEA
Seattle
SOF
Sofia
$571 Roundtrip, found 6 days ago
$571
Roundtrip
found 6 days ago
Select Air Canada flight, departing Tue, Nov 11 from Seattle to Sofia, returning Wed, Nov 19, priced at $571 found 6 days ago
Lufthansa
Wed, Nov 26 - Fri, Dec 12
SEA
Seattle
SOF
Sofia
$571 Roundtrip, found 9 hours ago
$571
Roundtrip
found 9 hours ago
Select Lufthansa flight, departing Wed, Nov 26 from Seattle to Sofia, returning Fri, Dec 12, priced at $571 found 9 hours ago
Air Canada
Sun, Feb 1 - Fri, Feb 20
SEA
Seattle
SOF
Sofia
$573 Roundtrip, found 1 day ago
$573
Roundtrip
found 1 day ago
Select Air Canada flight, departing Sun, Feb 1 from Seattle to Sofia, returning Fri, Feb 20, priced at $573 found 1 day ago
Air Canada
Wed, Nov 26 - Fri, Dec 12
SEA
Seattle
SOF
Sofia
$575 Roundtrip, found 9 hours ago
$575
Roundtrip
found 9 hours ago
Select Air Canada flight, departing Wed, Nov 26 from Seattle to Sofia, returning Fri, Dec 12, priced at $575 found 9 hours ago
United
Tue, Dec 30 - Thu, Jan 15
SEA
Seattle
SOF
Sofia
$576 Roundtrip, found 3 hours ago
$576
Roundtrip
found 3 hours ago
Select United flight, departing Tue, Dec 30 from Seattle to Sofia, returning Thu, Jan 15, priced at $576 found 3 hours ago
United
Mon, Jan 5 - Fri, Mar 6
SEA
Seattle
SOF
Sofia
$577 Roundtrip, found 16 hours ago
$577
Roundtrip
found 16 hours ago
Select United flight, departing Mon, Jan 5 from Seattle to Sofia, returning Fri, Mar 6, priced at $577 found 16 hours ago
American Airlines
Tue, Jan 6 - Wed, Mar 4
SEA
Seattle
SOF
Sofia
$579 Roundtrip, found 16 hours ago
$579
Roundtrip
found 16 hours ago
Select American Airlines flight, departing Tue, Jan 6 from Seattle to Sofia, returning Wed, Mar 4, priced at $579 found 16 hours ago

Find the cheapest month to fly from Seattle (SEA) to Sofia (SOF)

November is typically the cheapest month to fly

From $570 - $1,407 per traveler.

Frequently asked questions

How much does a flight from Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF) cost?
Grab a cheap one-way flight from $360 or cheap return flight from $566 from Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF) 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 Sofia Airport (SOF)?
November is the least expensive month to fly from SEA to SOF. Traveling during an off-peak travel window is often the key to finding better fares.
What is the cheapest airline that flies from Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF)?
To find the cheapest airline that'll fly you from SEA to SOF, use Expedia's filter tool. Tailor your search based on your travel style, such as preferred carriers and ideal departure window. You can then sort your results by "Price (lowest to highest)" to list the most affordable options first.
How many flights per day from Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF)?
There aren't any daily nonstop flights available from Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF). But you can choose flights with layovers. Filter your search results 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 SOF?
Typically you'll find the most flight options available on a Friday. Tuesdays tend to be the quietest.* However, this can change based on the season, carrier and other factors.*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 Sofia Airport (SOF)?
To land at Sofia Airport (SOF) without delays, choose a flight that leaves from Seattle - Tacoma Intl. Airport (SEA) 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 Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF) last-minute?
Booking your ticket from SEA to SOF shortly before your getaway is usually more expensive. However, if you're flexible with your travel dates and times, you could score a cheap last-minute fare.
Is it cheaper to book a SEA to SOF flight and hotel package?
Opting for a SEA to SOF flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the convenience of organizing your trip in one place. Select from our wide range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Seattle - Tacoma Intl. Airport (SEA) to Sofia Airport (SOF)?
Usually, it's possible to cancel or reschedule your SEA to SOF flight. However, if the booking was made more than 24 hours ago, additional fees may apply. Refer to your airline's policies in your itinerary to see what changes are allowed and whether any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Sofia
Airlines serving
Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Emirates, ITA Airways, Iberia, JetBlue Airways, KLM, Lufthansa, Swiss International Air Lines, Turkish Airlines, United
Roundtrip price
$566
Distance
5866 mi

Book with confidence

Book with confidence

Seattle to Sofia Flights

The cheapest times to fly from Seattle to Sofia

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

 

The best time to book a flight from Seattle to Sofia

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

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 Sofia in 2025. You can also book with separate airlines for your outbound and return journeys, from $360 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 Sofia 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 Sofia 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.

 

Seattle to Sofia Flights

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*Available to One Key members.