What airlines fly to Sofia?

Lufthansa, Turkish Airlines and KLM are the top three most popular airlines that fly to Sofia from Seattle according to our data. Lufthansa is the first choice among our users, with 45% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 4 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

Which airport is the most popular layover for flights between Seattle and Sofia?

Istanbul (IST) was the most common stop: 53% of momondo users choosing 1-stop flights on this route connected there.

What is the cheapest airline that flies from Seattle/Tacoma Intl to Sofia?

United Airlines is the most popular carrier operating from Seattle/Tacoma Intl to Sofia

Which layover airport offers the lowest fares from Seattle to Sofia?

Flights via Amsterdam (AMS) offer the lowest average round-trip price of $696.

Which layover airport has the shortest connection time from Seattle to Sofia?

Amsterdam (AMS) has the shortest average layover time for this route: 1h 28m.

Which layover airport has the shortest travel time from Seattle to Sofia?

Flights connecting via Amsterdam (AMS) have the shortest average one-way travel time: 14h 10m.

When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Sofia Airport?

Prices for flights from Seattle/Tacoma Intl Airport to Sofia Airport are updated daily.

How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Sofia Airport?

The number of operators available for flights from Seattle/Tacoma Intl Airport to Sofia Airport is 4 as of September 2026.

How old do you have to be to fly from Seattle/Tacoma Intl Airport to Sofia Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Sofia Airport.

What documentation or ID do you need to fly to Sofia Airport?

The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$278 Cheap Flights from Seattle to Sofia in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Seattle to Sofia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

3:40 pm - 10:30 pmSEA Seattle/Tacoma Intl-SOF Sofia

20h 50m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

4:00 pm - 6:00 pmSOF Sofia-SEA Seattle/Tacoma Intl

35h 00m3 stops Belgrade Nikola Tesla Kastrup Copenhagen Reykjavik Keflavik Intl

$632Multiple Airlines

Mon, Oct 19 - Mon, Oct 26

7:05 pm - 3:10 pmSEA Seattle/Tacoma Intl-SOF Sofia

34h 05m1 stop Istanbul

9:40 am - 5:10 pmSOF Sofia-SEA Seattle/Tacoma Intl

17h 30m1 stop Istanbul

$737Turkish Airlines

Thu, Feb 18 - Tue, Mar 2

7:15 pm - 8:20 pmSEA Seattle/Tacoma Intl-SOF Sofia

15h 05m1 stop Istanbul

4:00 pm - 6:10 pmSOF Sofia-SEA Seattle/Tacoma Intl

35h 10m1 stop Istanbul

$740Turkish Airlines

Sun, Oct 18 - Wed, Oct 28

3:40 pm - 11:40 amSEA Seattle/Tacoma Intl-SOF Sofia

34h 00m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Vienna Intl

4:00 pm - 6:00 pmSOF Sofia-SEA Seattle/Tacoma Intl

35h 00m3 stops Belgrade Nikola Tesla Kastrup Copenhagen Reykjavik Keflavik Intl

$741Multiple Airlines

Mon, Oct 19 - Mon, Oct 26

2:50 pm - 10:55 pmSEA Seattle/Tacoma Intl-SOF Sofia

22h 05m1 stop Munich Franz Josef Strauss

6:00 am - 1:00 pmSOF Sofia-SEA Seattle/Tacoma Intl

17h 00m1 stop Munich Franz Josef Strauss

$743Lufthansa

Sun, Dec 13 - Wed, Jan 6

2:50 pm - 10:55 pmSEA Seattle/Tacoma Intl-SOF Sofia

22h 05m1 stop Munich Franz Josef Strauss

6:25 am - 8:59 pmSOF Sofia-SEA Seattle/Tacoma Intl

24h 34m2 stops Frankfurt am Main Toronto Pearson Intl

$750Multiple Airlines

Sun, Dec 13 - Wed, Jan 6

10:54 am - 1:15 pmSEA Seattle/Tacoma Intl-SOF Sofia

16h 21m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

6:25 am - 12:00 pmSOF Sofia-SEA Seattle/Tacoma Intl

15h 35m1 stop Frankfurt am Main

$757United Airlines

Sun, Jan 17 - Thu, Jan 21

8:00 am - 1:15 pmSEA Seattle/Tacoma Intl-SOF Sofia

19h 15m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

6:25 am - 12:00 pmSOF Sofia-SEA Seattle/Tacoma Intl

15h 35m1 stop Frankfurt am Main

$757United Airlines

Sun, Jan 17 - Thu, Jan 21

7:15 pm - 8:45 amSEA Seattle/Tacoma Intl-SOF Sofia

27h 30m1 stop Istanbul

9:35 am - 5:20 pmSOF Sofia-SEA Seattle/Tacoma Intl

17h 45m1 stop Istanbul

$765Turkish Airlines

Sun, Sep 27 - Tue, Oct 6

6:50 pm - 11:15 pmSEA Seattle/Tacoma Intl-SOF Sofia

18h 25m1 stop Munich Franz Josef Strauss

6:10 am - 12:20 pmSOF Sofia-SEA Seattle/Tacoma Intl

16h 10m1 stop Frankfurt am Main

$817Lufthansa

Wed, Oct 7 - Tue, Oct 13

Cheap last minute flights

Enter your travel dates to find the best prices.

6:50 pm - 6:40 pmSEA Seattle/Tacoma Intl-SOF Sofia

13h 50m1 stop Munich Franz Josef Strauss

6:10 am - 11:55 amSOF Sofia-SEA Seattle/Tacoma Intl

15h 45m1 stop Frankfurt am Main

$906Lufthansa

Wed, Sep 9 - Tue, Sep 15

6:50 pm - 11:15 pmSEA Seattle/Tacoma Intl-SOF Sofia

18h 25m1 stop Munich Franz Josef Strauss

1:05 pm - 6:32 pmSOF Sofia-SEA Seattle/Tacoma Intl

39h 27m2 stops Zurich Vancouver Intl

$909Multiple Airlines

Wed, Sep 9 - Tue, Sep 15

7:00 am - 11:15 pmSEA Seattle/Tacoma Intl-SOF Sofia

30h 15m2 stops Chicago O'Hare Intl Munich Franz Josef Strauss

6:10 am - 6:32 pmSOF Sofia-SEA Seattle/Tacoma Intl

22h 22m2 stops Frankfurt am Main Vancouver Intl

$922United Airlines

Wed, Sep 9 - Tue, Sep 15

6:50 pm - 11:15 pmSEA Seattle/Tacoma Intl-SOF Sofia

18h 25m1 stop Munich Franz Josef Strauss

7:25 pm - 4:59 pmSOF Sofia-SEA Seattle/Tacoma Intl

31h 34m1 stop Munich Franz Josef Strauss

$929Lufthansa

Wed, Sep 9 - Mon, Sep 14

6:50 pm - 6:40 pmSEA Seattle/Tacoma Intl-SOF Sofia

13h 50m1 stop Munich Franz Josef Strauss

6:10 am - 11:55 amSOF Sofia-SEA Seattle/Tacoma Intl

15h 45m1 stop Frankfurt am Main

$963Lufthansa

Thu, Sep 10 - Tue, Sep 15

6:50 pm - 6:40 pmSEA Seattle/Tacoma Intl-SOF Sofia

13h 50m1 stop Munich Franz Josef Strauss

6:10 am - 2:17 pmSOF Sofia-SEA Seattle/Tacoma Intl

18h 07m2 stops Frankfurt am Main Vancouver Intl

$963Multiple Airlines

Thu, Sep 10 - Tue, Sep 15

8:10 am - 12:10 pmSEA Seattle/Tacoma Intl-SOF Sofia

18h 00m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

6:10 am - 2:17 pmSOF Sofia-SEA Seattle/Tacoma Intl

18h 07m2 stops Frankfurt am Main Vancouver Intl

$972United Airlines

Thu, Sep 10 - Tue, Sep 15

6:50 pm - 6:40 pmSEA Seattle/Tacoma Intl-SOF Sofia

13h 50m1 stop Munich Franz Josef Strauss

12:55 pm - 10:47 pmSOF Sofia-SEA Seattle/Tacoma Intl

19h 52m2 stops Munich Franz Josef Strauss Vancouver Intl

$974Multiple Airlines

Wed, Sep 9 - Mon, Sep 14

2:10 pm - 1:20 pmSEA Seattle/Tacoma Intl-SOF Sofia

13h 10m1 stop Frankfurt am Main

7:25 pm - 4:59 pmSOF Sofia-SEA Seattle/Tacoma Intl

31h 34m1 stop Munich Franz Josef Strauss

$991Lufthansa

Thu, Sep 10 - Mon, Sep 14

6:50 pm - 6:40 pmSEA Seattle/Tacoma Intl-SOF Sofia

13h 50m1 stop Munich Franz Josef Strauss

12:55 pm - 10:47 pmSOF Sofia-SEA Seattle/Tacoma Intl

19h 52m2 stops Munich Franz Josef Strauss Vancouver Intl

$1,023Multiple Airlines

Thu, Sep 10 - Mon, Sep 14

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

United Airlines flights from Seattle to Sofia

Our best United Airlines deals on Seattle to Sofia flight tickets

United Airlines

Jan 17

SEA10:54 amSeattle/Tacoma Intl

16h 21m

2 stops

SOF1:15 pmSofia

Jan 21

SOF6:25 amSofia

15h 35m

1 stop

SEA12:00 pmSeattle/Tacoma Intl

$757

United Airlines

Jan 17

SEA8:00 amSeattle/Tacoma Intl

19h 15m

2 stops

SOF1:15 pmSofia

Jan 21

SOF6:25 amSofia

40h 20m

3 stops

SEA12:45 pmSeattle/Tacoma Intl

$765

United Airlines

Dec 13

SEA5:24 pmSeattle/Tacoma Intl

19h 31m

2 stops

SOF10:55 pmSofia

Jan 6

SOF6:25 amSofia

40h 20m

3 stops

SEA12:45 pmSeattle/Tacoma Intl

$778

Turkish Airlines flights from Seattle to Sofia

Our best Turkish Airlines deals on Seattle to Sofia flight tickets

Turkish Airlines

Feb 18

SEA7:05 pmSeattle/Tacoma Intl

34h 05m

1 stop

SOF3:10 pmSofia

Mar 2

SOF9:40 amSofia

17h 30m

1 stop

SEA5:10 pmSeattle/Tacoma Intl

$737

Turkish Airlines

Oct 18

SEA7:15 pmSeattle/Tacoma Intl

15h 05m

1 stop

SOF8:20 pmSofia

Oct 28

SOF4:00 pmSofia

35h 10m

1 stop

SEA6:10 pmSeattle/Tacoma Intl

$740

Turkish Airlines

Oct 8

SEA7:15 pmSeattle/Tacoma Intl

27h 30m

1 stop

SOF8:45 amSofia

Oct 19

SOF3:50 pmSofia

35h 30m

1 stop

SEA5:20 pmSeattle/Tacoma Intl

$775

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSofia

SEA Seattle/Tacoma Intl - SOF Sofia

SEASOF

Seattle/Tacoma Intl

Mon 10/19

3:40 pm-10:30 pm

2 stops20h 50m

Sofia

Mon 10/26

4:00 pm-6:00 pm

3 stops35h 00m

$632

SeattleSofia

SEA Seattle/Tacoma Intl - SOF Sofia

SEASOF

Seattle/Tacoma Intl

Thu 2/18

7:05 pm-3:10 pm

1 stop34h 05m

Sofia

Tue 3/2

9:40 am-5:10 pm

1 stop17h 30m

$737

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

Mon 10/19

3:40 pm-11:40 am

3 stops34h 00m

Sofia

Mon 10/26

4:00 pm-6:00 pm

3 stops35h 00m

$741

SeattleSofia

SEA Seattle/Tacoma Intl - SOF Sofia

SEASOF

Seattle/Tacoma Intl

Sun 12/13

2:50 pm-10:55 pm

1 stop22h 05m

Sofia

Wed 1/6

6:00 am-1:00 pm

1 stop17h 00m

$743

SeattleSofia

SEA Seattle/Tacoma Intl - SOF Sofia

SEASOF

Seattle/Tacoma Intl

Sun 12/13

2:50 pm-10:55 pm

1 stop22h 05m

Sofia

Wed 1/6

6:25 am-8:59 pm

2 stops24h 34m

$750

Quickest round-trip

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 1/17

8:00 am-1:15 pm

2 stops19h 15m

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 9/27

7:15 pm-8:45 am

1 stop27h 30m

Sofia

Tue 10/6

9:35 am-5:20 pm

1 stop17h 45m

$765

SeattleSofia

SEA Seattle/Tacoma Intl - SOF Sofia

SEASOF

Seattle/Tacoma Intl

Wed 10/7

6:50 pm-11:15 pm

1 stop18h 25m

Sofia

Tue 10/13

6:10 am-12:20 pm

1 stop16h 10m

$817

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Seattle to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

What is the typical price of a round-trip flight between Seattle and Sofia?

Prices are currently low for flights on this route.

Typical prices usually range from $658 to $1,089.
The lowest price recently found on this route was $632.

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from Seattle is in October. Flight prices, which tend to average around $605, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from Seattle during January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $615.

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

You are more likely to see cheaper flights to Sofia from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $764 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from Seattle for as low as $673 on momondo.

When to book flights from Seattle to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from Seattle to Sofia according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Seattle to Sofia (SEA to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Seattle to Sofia

Best Price Found	$278
Fastest flight time	15h 05m
Direct flights	None

The best one-way flight to Sofia from Seattle in the past 72 hours is $278. The best round-trip flight deal from Seattle to Sofia found on momondo in the last 72 hours is $632.

The fastest flight from Seattle to Sofia takes 15h 05m

There are no direct flights from Seattle to Sofia. There are no popular flight routes from Seattle to Sofia.

Search flight deals

Frequently asked questions about flying from Seattle to Sofia

How far is Seattle/Tacoma Intl to Sofia by plane?
There are 5850.6 mi between Seattle/Tacoma Intl and Sofia. Flights usually cover this in 15h 05m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Sofia Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Sofia Airport are updated daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Sofia Airport?
The number of operators available for flights from Seattle/Tacoma Intl Airport to Sofia Airport is 4 as of September 2026.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Sofia Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Sofia Airport.
What documentation or ID do you need to fly to Sofia Airport?
The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Seattle to Sofia?
Based on momondo bookings for flights between Seattle and Sofia, the leading airline is Lufthansa, making up 45% of the total bookings. Other popular airlines include Turkish Airlines with 32%, KLM with 18%, and United Airlines with 5%.

Best airlines flying from Seattle to Sofia

Compare and see reviews for airlines that fly from Seattle to Sofia with momondo

Airline	Rating	Free Cancellation	Price
KLM	PriceFrom $538	Free Cancellation	Rating 7.8 1,573 reviews	Search KLM flights
Lufthansa	PriceFrom $540	Free Cancellation	Rating 6.8 8,216 reviews	Search Lufthansa flights
United Airlines	PriceFrom $545	Free Cancellation	Rating 7.4 10,180 reviews	Search United Airlines flights
Turkish Airlines	PriceFrom $571	Free Cancellation	Rating 7.4 4,476 reviews	Search Turkish Airlines flights

Bansko

Borovets

Velingrad

Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from Seattle to Sofia?

It is quick and easy to find Seattle to Sofia flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Sofia that suits you.

Can I find flights from Seattle to Sofia with flexible booking policies on momondo?

All flight searches from Seattle to Sofia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Seattle to Sofia?

Once all potential Seattle to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Seattle to Sofia right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Sofia from Seattle. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Wed 10/7

Wed 10/14

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Bulgaria

Airlines

Cabin classes

Other Bulgaria destinations

Other flights from Seattle

Complete your trip

Feeling lucky

Fly your favorite airline to Sofia

Cheap flights from Seattle to Sofia from $278

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Sofia departing on 10/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Find the cheapest flights from Seattle to Sofia

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

United Airlines flights from Seattle to Sofia

Our best United Airlines deals on Seattle to Sofia flight tickets

Turkish Airlines flights from Seattle to Sofia

Our best Turkish Airlines deals on Seattle to Sofia flight tickets

momondo Fare Finder

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

See travel insights to Sofia from

How to get the cheapest flight ticket from Seattle to Sofia

What is the typical price of a round-trip flight between Seattle and Sofia?

What is the cheapest month to fly to Sofia?

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

What is the cheapest airline that flies from Seattle/Tacoma Intl to Sofia?

What airlines fly to Sofia?

Which airport is the most popular layover for flights between Seattle and Sofia?

Which layover airport offers the lowest fares from Seattle to Sofia?

Which layover airport has the shortest travel time from Seattle to Sofia?

Which layover airport has the shortest connection time from Seattle to Sofia?

When to book flights from Seattle to Sofia

Cheap Seattle to Sofia (SEA to SOF) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Seattle to Sofia

Best airlines flying from Seattle to Sofia

Compare and see reviews for airlines that fly from Seattle to Sofia with momondo

Traveling to a place near Sofia?

Why use momondo?

An easier way to manage your Sofia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Bulgaria

Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Sofia

List of cabin classes available on flights landing in Sofia. Availability may vary depending on flight origin and airline.

Popular cities in Bulgaria

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from Seattle

According to popular flight searches on momondo this year

Complete your trip to Sofia

Explore popular destinations other users love

According to popular flight searches on momondo this year