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$283+ 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 11/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOF
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Sofia are usually found in October or January, booked 35 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 November 13, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$529
(Air France)

One-way from

$283
(Kiwi.com)

Popular in

December

Cheapest in

October

Average price

$660
Provider with most accurate pricing for Seattle/Tacoma Intl-Sofia flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sofia flights.
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From Seattle/Tacoma Intl to Sofia
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One-way flight from Seattle/Tacoma Intl to Sofia
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High demand for flights, 2% potential price rise
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Cheapest flight prices on average. 4% potential price decrease ($32 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 13, 2025.

This Air France deal was found by Cheapflights users on 11/12. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/109:30 amSEA - SOF
2 stops18h 35mMultiple Airlines
Tue 12/167:00 amSOF - SEA
1 stop14h 50mMultiple Airlines
Deal found 11/12$533
This KLM deal was found by Cheapflights users on 11/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/109:25 amSEA - SOF
2 stops18h 40mKLM
Mon 12/157:00 amSOF - SEA
1 stop14h 50mKLM
Deal found 11/11$539
This KLM deal was found by Cheapflights users on 11/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:25 amSEA - SOF
2 stops18h 40mKLM
Tue 12/167:00 amSOF - SEA
2 stops23h 35mKLM
Deal found 11/12$549
This United Airlines deal was found by Cheapflights users on 11/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/101:05 pmSEA - SOF
2 stops23h 40mUnited Airlines
Tue 12/166:00 amSOF - SEA
1 stop16h 10mUnited Airlines
Deal found 11/11$632
This United Airlines deal was found by Cheapflights users on 11/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/103:25 pmSEA - SOF
2 stops21h 20mUnited Airlines
Wed 12/176:05 amSOF - SEA
1 stop17h 15mUnited Airlines
Deal found 11/11$634
This KLM deal was found by Cheapflights users on 11/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:25 amSEA - SOF
2 stops18h 40mKLM
Mon 12/157:00 amSOF - SEA
2 stops20h 00mKLM
Deal found 11/12$649
This United Airlines deal was found by Cheapflights users on 11/12. 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 12/103:45 pmSEA - SOF
2 stops16h 35mUnited Airlines
Mon 12/151:45 pmSOF - SEA
3 stops43h 30mUnited Airlines
Deal found 11/12$653

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 November 13, 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

Wed 12/10

9:30 am-2:05 pm

2 stops18h 35m

Sofia

Mon 12/15

7:00 am-11:50 am

1 stop14h 50m

$533

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 12/10

9:25 am-2:05 pm

2 stops18h 40m

Sofia

Tue 12/16

7:00 am-11:50 am

1 stop14h 50m

$539

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Thu 12/11

9:25 am-2:05 pm

2 stops18h 40m

Sofia

Tue 12/16

7:00 am-11:50 am

1 stop14h 50m

$539

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Fri 12/12

9:25 am-2:05 pm

2 stops18h 40m

Sofia

Mon 12/15

7:00 am-11:50 am

1 stop14h 50m

$539

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Fri 12/12

9:25 am-2:05 pm

2 stops18h 40m

Sofia

Tue 12/16

7:10 am-8:13 pm

2 stops23h 03m

$554

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 12/10

1:05 pm-10:45 pm

2 stops23h 40m

Sofia

Mon 12/15

6:10 am-12:10 pm

1 stop16h 00m

$632

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Fri 12/12

9:25 am-2:05 pm

2 stops18h 40m

Sofia

Tue 12/16

7:00 am-11:50 am

1 stop14h 50m

$639

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 12/10

1:05 pm-10:45 pm

2 stops23h 40m

Sofia

Wed 12/17

2:00 pm-8:23 am

2 stops28h 23m

$644

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Fri 12/12

9:25 am-2:05 pm

2 stops18h 40m

Sofia

Wed 12/17

7:00 am-1:25 pm

1 stop16h 25m

$644

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Thu 1/8

5:10 pm-10:45 pm

2 stops19h 35m

Sofia

Tue 1/13

6:00 am-9:12 pm

3 stops25h 12m

$644

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/12

Showing 1-10 of 20 results
1
2

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 November.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy2 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Sofia flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Sofia. Price data was last updated on November 7, 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 35 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 $537). Flying from Seattle to Sofia in June is currently the most expensive (average of $943). 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 November 13, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 18% 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 November 13, 2025.
Get a feel of what it's like to fly with KLM, Air France, and United 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
7.7
Good
1,410 reviews

Boarding

7.8

Comfort

7.7

Food

7.3

Overall

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,410 reviews
KLM
7.7
Good
1,410 reviews

Boarding

7.8

Comfort

7.7

Food

7.3

Overall

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Air France
7.4
Good
1,486 reviews
KLM
7.7
Good
1,410 reviews

Boarding

7.8

Comfort

7.7

Food

7.3

Overall

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
9,015 reviews
KLM
7.7
Good
1,410 reviews

Boarding

7.8

Comfort

7.7

Food

7.3

Overall

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Turkish Airlines
7.3
Good
4,044 reviews
KLM
7.7
Good
1,410 reviews

Boarding

7.8

Comfort

7.7

Food

7.3

Overall

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,570 reviews
KLM
7.7
Good
1,410 reviews

Boarding

7.8

Comfort

7.7

Food

7.3

Overall

7.7

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

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 18h 40m. KLM provides one of the quickest options available for as low as $539. Seattle and Sofia are separated by a distance of 5862 mi.

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

    Cheapflights users have booked flights from Seattle to Sofia round-trip from $555. Other airlines that can offer you cheap pricing are Lufthansa, from $562, and Turkish Airlines, from $596. Air France is 33% 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 $537). Flying from Seattle to Sofia in June is currently the most expensive (average of $943). 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 5 airlines flying from Seattle to Sofia

Discover the top 5 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air FranceCheapest$555Average$718FlexibilityNo cancel feeOn-time77%
LufthansaCheapest$562Average$885FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$596Average$869FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$676Average$980FlexibilityNo cancel feeOn-time69%
KLMCheapest$719Average$942FlexibilityNo cancel feeOn-time75%

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