$466+ 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 11/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOF
Oct 11 — Oct 181
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Sofia with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Sofia
Cheapest
Best
Last-minute
One-way
Cheapest flights from Seattle to SofiaExplore 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, 2026.
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, 2026.
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 12/132:50 pm -
1 stop22h 05m
Fri 1/86:00 am -
1 stop17h 00m
Deal found 9/10![United Airlines logo]()
$647
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.
Fri 10/303:50 pm -
1 stop22h 05m
Tue 11/36:00 am -
2 stops22h 22m
Deal found 9/10![Multiple Airlines logo]()
$649
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 12/132:50 pm -
1 stop22h 05m
Tue 1/52:00 pm -
1 stop33h 00m
Deal found 9/10![United Airlines logo]()
$657
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 10/183:00 pm -
2 stops17h 40m
Sat 10/312:00 pm -
1 stop33h 00m
Deal found 9/10![Multiple Airlines logo]()
$659
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/132:50 pm -
1 stop22h 05m
Thu 1/77:05 pm -
1 stop27h 55m
Deal found 9/10![Lufthansa logo]()
$662
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:50 pm -
1 stop22h 05m
Tue 11/32:00 pm -
1 stop33h 00m
Deal found 9/10![Lufthansa logo]()
$669
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:50 pm -
1 stop13h 50m
Sat 10/317:05 pm -
1 stop27h 55m
Deal found 9/10![Lufthansa logo]()
$675
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 12/132:50 pm -
1 stop22h 05m
Sat 1/96:00 am -
2 stops26h 39m
Deal found 9/10![United Airlines logo]()
$677
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:50 pm -
1 stop18h 25m
Fri 10/166:10 am -
1 stop20h 49m
Deal found 9/11![Lufthansa logo]()
$681
Best flights from Seattle to SofiaDiscover carefully curated flight deals from Seattle to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
Discover carefully curated flight deals from Seattle to Sofia that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 11, 2026.
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 12/132:50 pm -
1 stop22h 05m
Fri 1/86:00 am -
1 stop17h 00m
Deal found 9/10![United Airlines logo]()
$647
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:50 pm -
2 stops17h 40m
Fri 10/166:10 am -
2 stops16h 10m
Deal found 9/11![Lufthansa logo]()
$731
This Turkish Airlines deal was found by Cheapflights users on 9/6. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/187:15 pm -
1 stop15h 05m
Wed 10/284:00 pm -
1 stop35h 10m
Deal found 9/6![Turkish Airlines logo]()
$740
This Gotogate deal was found by Cheapflights users on 9/8. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/42:50 pm -
1 stop17h 30m
Tue 11/106:00 am -
2 stops22h 22m
Deal found 9/8![Multiple Airlines logo]()
$789
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 12/136:15 am -
3 stops30h 45m
Tue 1/56:25 am -
2 stops40h 35m
Deal found 9/10![United Airlines logo]()
$744
This FlightHub deal was found by Cheapflights users on 9/6. 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 10/87:15 pm -
1 stop33h 45m
Mon 10/193:50 pm -
1 stop35h 30m
Deal found 9/6![Turkish Airlines logo]()
$775
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 1/1710:54 am -
2 stops16h 21m
Thu 1/216:25 am -
1 stop15h 35m
Deal found 9/10![United Airlines logo]()
$757
This United Airlines deal was found by Cheapflights users on 9/8. 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 3/78:00 am -
2 stops19h 15m
Tue 3/166:25 am -
3 stops25h 56m
Deal found 9/8![United Airlines logo]()
$767
Last-minute flights from Seattle to SofiaDiscover last-minute flight deals from Seattle to Sofia. Data last updated September 11, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Sofia. Data last updated September 11, 2026 and is based on user searches.
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:50 pm -
1 stop13h 50m
Mon 10/197:25 pm -
1 stop31h 34m
Deal found 9/10![Lufthansa logo]()
$686
This KAYAK 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:50 pm -
1 stop13h 50m
Mon 10/193:40 pm -
2 stops37h 12m
Deal found 9/10![Multiple Airlines logo]()
$703
This United Airlines deal was found by Cheapflights users on 9/9. 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.
Thu 10/89:05 am -
2 stops28h 10m
Mon 10/192:20 pm -
2 stops34h 02m
Deal found 9/9![United Airlines logo]()
$717
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:50 pm -
1 stop18h 25m
Fri 10/166:10 am -
1 stop20h 49m
Deal found 9/11![Lufthansa logo]()
$681
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:50 pm -
1 stop18h 25m
Fri 10/168:00 am -
2 stops22h 37m
Deal found 9/11![United Airlines logo]()
$705
This Justfly.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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/107:15 pm -
2 stops41h 45m
Sat 10/177:25 pm -
1 stop31h 34m
Deal found 9/10![Lufthansa logo]()
$722
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 10/183:00 pm -
2 stops17h 40m
Sat 10/312:00 pm -
1 stop33h 00m
Deal found 9/10![Multiple Airlines logo]()
$659
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:50 pm -
1 stop13h 50m
Sat 10/317:05 pm -
1 stop27h 55m
Deal found 9/10![Lufthansa logo]()
$675
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.
Fri 10/303:50 pm -
1 stop22h 05m
Tue 11/36:00 am -
2 stops22h 22m
Deal found 9/10![Multiple Airlines logo]()
$649
This oojo 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/303:50 pm -
1 stop22h 05m
Tue 11/32:00 pm -
1 stop33h 00m
Deal found 9/10![Lufthansa logo]()
$669
One-way flights from Seattle to SofiaSearch for one-way flight options from Seattle to Sofia. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
Search for one-way flight options from Seattle to Sofia. Find affordable one-way fares based on user searches. Data last updated September 11, 2026.
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.
Wed 11/42:50 pm -
1 stop22h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![United Airlines logo]()
$466
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 September 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $647 (United Airlines) |
One-way from | $466 (United Airlines) |
Popular in | June |
Cheapest in | October |
Average price | $793 |
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 7,457,451 searches. Data last updated September 11, 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
Cheapest round-trip
Quickest round-trip
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Wed 11/4
2:50 pm-10:55 pm
1 stop22h 05m
Sofia
Wed 12/31
12:00 am-2:00 pm
Nonstop0h 00m
$466
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Sun 12/13
2:50 pm-10:55 pm
1 stop22h 05m
Sofia
Fri 1/8
6:00 am-1:00 pm
1 stop17h 00m
$647
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Fri 10/9
6:50 pm-10:30 pm
2 stops17h 40m
Sofia
Fri 10/16
6:10 am-12:20 pm
2 stops16h 10m
$731
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Sun 10/18
7:15 pm-8:20 pm
1 stop15h 05m
Sofia
Wed 10/28
4:00 pm-6:10 pm
1 stop35h 10m
$740
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Sun 12/13
6:15 am-11:00 pm
3 stops30h 45m
Sofia
Tue 1/5
6:25 am-1:00 pm
2 stops40h 35m
$744
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Sun 1/17
10:54 am-1:15 pm
2 stops16h 21m
Sofia
Thu 1/21
6:25 am-12:00 pm
1 stop15h 35m
$757
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Sun 3/7
8:00 am-1:15 pm
2 stops19h 15m
Sofia
Tue 3/16
6:25 am-11:21 pm
3 stops25h 56m
$767
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Thu 10/8
7:15 pm-3:00 pm
1 stop33h 45m
Sofia
Mon 10/19
3:50 pm-5:20 pm
1 stop35h 30m
$775
SeattleSofia
SEA Seattle/Tacoma Intl - SOF Sofia
SEASOF
Seattle/Tacoma Intl
Wed 11/4
2:50 pm-6:20 pm
1 stop17h 30m
Sofia
Tue 11/10
6:00 am-6:22 pm
2 stops22h 22m
$789
Sorted by cheapest first
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
SEA-SOF
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 34 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 $605). Flying from Seattle to Sofia in June is currently the most expensive (average of $1,147). 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?
Airfare is below average for this route at the moment.
Seattle to Sofia flights typically cost between $658 and $1,089 in December.The cheapest round-trip price found within the last 5 days was $647 on United Airlines (Dec 13-Jan 8).
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, 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.
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Overall
7.8
Entertainment
7.2
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Overall
7.8
Entertainment
7.2
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Overall
7.8
Entertainment
7.2
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Overall
7.8
Entertainment
7.2
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
Crew
8.4
Comfort
7.7
Food
7.3
Boarding
7.8
Overall
7.8
Entertainment
7.2
Reviews
1 / 20
4.0
OkayAbhisek,Aug 2026
JFK - AMS
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.
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Complete your trip
Complete your trip to Sofia by adding a car rental and/or hotel reservation to your travel itinerary.
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Find flights from Seattle to Sofia, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Seattle and Sofia flights
Browse other Seattle and Sofia flight options. Last updated on September 11, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Sofia
Explore flights to Sofia departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 11, 2026.
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 7,457,451 searches. Data last updated September 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$538 | Average$909 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$540 | Average$921 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$545 | Average$957 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$571 | Average$718 | FlexibilityNo cancel fee | On-time77% |