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Sofia

$311+ Cheap flights from Seattle (SEA) to Sofia (SOF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOF
Jul 12 — Jul 191
Sun 7/12
Sun 7/19
1 adult, Economy
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Cheap flight deals from Seattle to Sofia

Cheapest flights from Seattle to Sofia
Explore the most affordable flight options available from Seattle to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2026.

This oojo deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/66:50 pm
SEA
-
SOF
1 stop13h 50m
Lufthansa
Tue 9/226:10 am
SOF
-
SEA
1 stop15h 45m
Lufthansa
Deal found 6/8$748
This Booking.com deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/3112:35 pm
SEA
-
SOF
1 stop16h 25m
Turkish Airlines
Fri 9/119:10 pm
SOF
-
SEA
1 stop23h 30m
Turkish Airlines
Deal found 6/11$749
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/76:50 pm
SEA
-
SOF
1 stop18h 25m
United Airlines
Tue 10/136:10 am
SOF
-
SEA
1 stop20h 49m
United Airlines
Deal found 6/8$766
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/67:00 am
SEA
-
SOF
2 stops30h 15m
United Airlines
Tue 9/2212:55 pm
SOF
-
SEA
1 stop14h 04m
United Airlines
Deal found 6/8$770
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/233:15 pm
SEA
-
SOF
2 stops41h 05m
Air Canada
Mon 11/301:55 pm
SOF
-
SEA
2 stops38h 27m
Air Canada
Deal found 6/11$776
This Justfly.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/65:45 am
SEA
-
SOF
2 stops26h 25m
Air Canada
Tue 9/226:10 am
SOF
-
SEA
2 stops22h 22m
Air Canada
Deal found 6/8$777
This FlightHub deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/46:50 pm
SEA
-
SOF
1 stop18h 25m
Lufthansa
Fri 10/96:20 am
SOF
-
SEA
1 stop16h 00m
Lufthansa
Deal found 6/8$781
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/46:50 pm
SEA
-
SOF
1 stop18h 25m
United Airlines
Tue 10/136:10 am
SOF
-
SEA
2 stops26h 32m
United Airlines
Deal found 6/8$782
This Air Canada deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/43:00 pm
SEA
-
SOF
2 stops17h 40m
Air Canada
Fri 10/96:10 am
SOF
-
SEA
2 stops26h 32m
Air Canada
Deal found 6/8$783
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/53:55 pm
SEA
-
SOF
2 stops21h 20m
United Airlines
Fri 10/96:20 am
SOF
-
SEA
1 stop16h 00m
United Airlines
Deal found 6/8$787
This Air Canada deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/223:15 pm
SEA
-
SOF
2 stops36h 10m
Air Canada
Mon 11/301:55 pm
SOF
-
SEA
2 stops42h 02m
Air Canada
Deal found 6/11$788

Find flight deals from Seattle to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Sofia (SOF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated June 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$748
(oojo)

One-way from

$311
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$1,178
Provider with most accurate pricing for Seattle/Tacoma Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sofia flights.
Search Deals
From Seattle/Tacoma Intl to Sofia
Search Deals
One-way flight from Seattle/Tacoma Intl to Sofia
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($192 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2026.
Use the filters below to find and compare flights from Seattle to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Mon 8/31

7:15 pm-8:20 pm

1 stop15h 05m

Sofia

Fri 9/11

9:35 am-10:40 am

1 stop35h 05m

$768

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sun 9/6

3:54 pm-11:15 pm

2 stops21h 21m

Sofia

Tue 9/22

6:10 am-11:55 am

1 stop15h 45m

$829

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sun 8/23

7:00 am-11:15 pm

2 stops30h 15m

Sofia

Tue 9/1

6:10 am-4:59 pm

1 stop20h 49m

$830
Quickest round-trip

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sun 8/23

6:50 pm-11:15 pm

1 stop18h 25m

Sofia

Sun 9/6

6:20 am-11:55 am

1 stop15h 35m

$834

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 7/8

7:00 am-11:15 pm

2 stops30h 15m

Sofia

Fri 8/21

6:20 am-9:41 pm

2 stops25h 21m

$838

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 7/7

3:40 pm-11:15 pm

2 stops21h 35m

Sofia

Wed 8/26

6:10 am-9:58 pm

2 stops25h 48m

$840

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Mon 8/31

11:04 pm-6:00 pm

2 stops32h 56m

Sofia

Fri 9/11

6:20 am-11:55 am

1 stop15h 35m

$841

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 8/26

7:11 am-11:15 pm

2 stops30h 04m

Sofia

Mon 9/14

2:20 pm-7:15 pm

2 stops38h 55m

$859

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 7/28

6:50 pm-11:15 pm

1 stop18h 25m

Sofia

Sat 8/29

6:10 am-4:59 pm

1 stop20h 49m

$863

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Thu 8/13

9:00 am-11:15 pm

2 stops28h 15m

Sofia

Thu 8/20

6:10 am-4:59 pm

1 stop20h 49m

$863

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 22 resultsSorted by cheapest first
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2
3

Compare providers for flights from Seattle to Sofia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Sofia in June.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Sofia flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Sofia flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Sofia flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Sofia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Sofia

How far ahead should I book a flight from Seattle to Sofia?

The price you pay for your flight from Seattle to Sofia may vary depending on when you book. For the best chance of a lower fare, look to book 28 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Seattle to Sofia?

Currently, October is the cheapest month in which you can book a flight from Seattle to Sofia (average of $587). Flying from Seattle to Sofia in June is currently the most expensive (average of $1,178). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost to fly round-trip from Seattle to Sofia?

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sofia. Reviews last updated June 12, 2026.
Get a feel of what it's like to fly with KLM,Turkish Airlines, andUnited Airlines from Seattle to Sofia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,527 reviews

Comfort

7.7

Overall

7.8

Food

7.3

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,527 reviews
KLM
7.8
Good
1,527 reviews

Comfort

7.7

Overall

7.8

Food

7.3

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Turkish Airlines
7.4
Good
4,410 reviews
KLM
7.8
Good
1,527 reviews

Comfort

7.7

Overall

7.8

Food

7.3

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7.4
Good
9,813 reviews
KLM
7.8
Good
1,527 reviews

Comfort

7.7

Overall

7.8

Food

7.3

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
Lufthansa
6.8
Okay
8,056 reviews
KLM
7.8
Good
1,527 reviews

Comfort

7.7

Overall

7.8

Food

7.3

Boarding

7.8

Entertainment

7.2

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

Related info for your journey

Find useful and relevant information for your journey from Seattle to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Sofia?

    A quick flight from Seattle to Sofia can take about 15h 05m. Turkish Airlines provides one of the quickest options available for as low as $768. Seattle and Sofia are separated by a distance of 5862 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines flying from Seattle to Sofia round-trip?

    Cheapflights users have booked flights from Seattle to Sofia round-trip from $538. Other airlines that can offer you cheap pricing are Lufthansa, from $540, and United Airlines, from $545. KLM is 28% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from Seattle to Sofia that include hotel bookings?

    Yes. In addition to deals on Seattle to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Sofia.

  • Can I find deals for business class flights from Seattle to Sofia?

    Yes. Cheapflights offers flight deals from Seattle to Sofia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Sofia?

    Currently, October is the cheapest month in which you can book a flight from Seattle to Sofia (average of $587). Flying from Seattle to Sofia in June is currently the most expensive (average of $1,178). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Seattle to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Sofia flights

Top 4 airlines flying from Seattle to Sofia

Discover the top 4 airlines that operate flights from Seattle to Sofia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated June 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$538Average$908FlexibilityNo cancel feeOn-time75%
LufthansaCheapest$540Average$907FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$545Average$885FlexibilityNo cancel feeOn-time69%
Turkish AirlinesCheapest$572Average$681FlexibilityNo cancel feeOn-time77%

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