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$530+ Cheap flights from Seattle (SEA) to Sofia (SOF)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/19. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOF
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Sofia are usually found in January or April, booked 44 days in advance, depart on a Saturday or Monday and return on a Sunday

Cheap 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 September 11, 2025.

Round-trip from

$530
(Kiwi.com)

Popular in

December

Cheapest in

January

Average price

$838
From Seattle/Tacoma Intl to Sofia
Search Deals
Highest demand for flights based on searches. 3% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($47 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find 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 September 11, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/196:50 pmSEA - SOF
1 stop13h 50mLufthansa
Tue 11/46:00 amSOF - SEA
1 stop16h 10mLufthansa
Deal found 9/10$530
This Gotogate deal was found by Cheapflights users on 9/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1110:05 amSEA - SOF
2 stops26h 40mMultiple Airlines
Wed 11/196:10 amSOF - SEA
2 stops37h 21mMultiple Airlines
Deal found 9/11$553
This FlightHub deal was found by Cheapflights users on 9/10. 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.
Thu 10/167:10 pmSEA - SOF
1 stop15h 15mTurkish Airlines
Fri 10/314:00 pmSOF - SEA
1 stop35h 05mTurkish Airlines
Deal found 9/10$561
This Gotogate deal was found by Cheapflights users on 9/10. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/1910:00 amSEA - SOF
2 stops21h 50mMultiple Airlines
Tue 11/46:00 amSOF - SEA
1 stop16h 10mMultiple Airlines
Deal found 9/10$565
This FlightHub deal was found by Cheapflights users on 9/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/217:10 pmSEA - SOF
1 stop27h 25mTurkish Airlines
Fri 10/109:15 pmSOF - SEA
1 stop30h 00mTurkish Airlines
Deal found 9/11$570
This Gotogate deal was found by Cheapflights users on 9/11. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/710:05 amSEA - SOF
2 stops26h 40mMultiple Airlines
Mon 12/151:55 pmSOF - SEA
2 stops58h 36mMultiple Airlines
Deal found 9/11$573
This Cheapflightsfares deal was found by Cheapflights users on 9/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/112:00 pmSEA - SOF
1 stop13h 45mLufthansa
Wed 11/196:05 amSOF - SEA
1 stop17h 15mLufthansa
Deal found 9/11$580
This United Airlines deal was found by Cheapflights users on 9/10. 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 10/198:00 amSEA - SOF
2 stops18h 00mUnited Airlines
Tue 11/46:00 amSOF - SEA
3 stops24h 51mUnited Airlines
Deal found 9/10$586
This Expedia deal was found by Cheapflights users on 9/11. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/73:10 pmSEA - SOF
1 stop17h 10mLufthansa
Mon 12/152:20 pmSOF - SEA
1 stop31h 50mLufthansa
Deal found 9/11$591

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 September 11, 2025.
Use the filters below to find and compare flights from Seattle to Sofia that are best for you.

Fly from

Seattle

Fly to

Sofia

Route

Depart

Return

Price

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 3/10

2:25 pm-8:10 pm

1 stop20h 45m

Sofia

Wed 4/29

9:30 pm-11:35 am

1 stop24h 05m

$568

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sun 3/8

4:10 pm-10:45 pm

1 stop21h 35m

Sofia

Fri 4/24

6:15 am-11:55 am

1 stop15h 40m

$573

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Mon 3/9

10:05 am-1:25 pm

2 stops18h 20m

Sofia

Tue 4/28

6:15 am-11:55 am

1 stop15h 40m

$577

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Mon 3/9

3:00 pm-10:45 pm

1 stop22h 45m

Sofia

Thu 4/30

6:15 am-11:55 am

1 stop15h 40m

$577

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sun 3/8

6:35 am-10:45 pm

2 stops31h 10m

Sofia

Thu 4/30

6:15 am-11:55 am

1 stop15h 40m

$578

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 3/10

3:51 pm-6:20 pm

2 stops17h 29m

Sofia

Thu 4/30

6:15 am-11:55 am

1 stop15h 40m

$578

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 3/10

10:05 am-6:20 pm

2 stops23h 15m

Sofia

Tue 4/28

12:00 pm-9:51 pm

2 stops43h 51m

$579

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Mon 3/9

8:00 pm-6:20 pm

2 stops37h 20m

Sofia

Fri 4/24

1:50 pm-9:51 pm

2 stops42h 01m

$579

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sat 3/7

11:59 pm-1:35 pm

2 stops27h 36m

Sofia

Fri 4/24

6:15 am-11:55 am

1 stop15h 40m

$581

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sat 3/7

11:50 pm-6:00 pm

2 stops32h 10m

Sofia

Thu 4/30

6:15 am-11:55 am

1 stop15h 40m

$581

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/11

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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Sofia. Price data was last updated on August 29, 2025.

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 44 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, November is the cheapest month in which you can book a flight from Seattle to Sofia (average of $632). Flying from Seattle to Sofia in June is currently the most expensive (average of $1,185). 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.

What is the cheapest time of day to fly from SEA to SOF?

Find hourly flight availability from Seattle to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 19% on flights from Seattle to Sofia by exploring options for tickets in the evening.

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 September 11, 2025.
Get a feel of what it's like to fly with KLM, United Airlines, and Turkish 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
1,385 reviews

Crew

8.4

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
KLM
7.8
Good
1,385 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
United Airlines
7.4
Good
8,937 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Turkish Airlines
7.3
Good
3,968 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.
Lufthansa
6.8
Okay
7,409 reviews
KLM
7.8
Good
1,385 reviews

Crew

8.4

Boarding

7.8

Entertainment

7.2

Overall

7.8

Food

7.3

Comfort

7.7

Reviews

1 / 20
4.0
Okay

Mark,Sep 2025

AMS - BHX

Crew and snacks were good, boarding wasn't great as busses were used rather than boarding tunnels. Also endured a one hour delay.

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 20h 45m. British Airways provides one of the quickest options available for as low as $568. 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 $609. Other airlines that can offer you cheap pricing are United Airlines, from $653, and Lufthansa, from $663. Turkish Airlines is 31% 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, November is the cheapest month in which you can book a flight from Seattle to Sofia (average of $632). Flying from Seattle to Sofia in June is currently the most expensive (average of $1,185). 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
Spokane 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$609Average$891FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$653Average$980FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$663Average$904FlexibilityNo cancel feeOn-time76%
KLMCheapest$719Average$942FlexibilityNo cancel feeOn-time75%

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