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

British Airways, Lufthansa, and KLM are the most popular carriers operating from Seattle/Tacoma Intl to Sofia

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

Istanbul (IST) was the most common stop: 71% of momondo users choosing 1-stop flights on this route connected there.

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

Flights connecting via Munich (MUC) have the shortest average one-way travel time: 13h 50m.

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

Munich (MUC) has the shortest average layover time for this route: 2h 00m.

What airlines fly to Sofia?

Turkish Airlines, Lufthansa and KLM are the top three most popular airlines that fly to Sofia from Seattle according to our data. Turkish Airlines is the first choice among our users, with 48% of people opting to fly with this airline when traveling to Sofia. Keep in mind that there are 5 different airlines that fly to Sofia on a routine basis, so you have a few additional options to choose from.

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

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $739.

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 5 as of January 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.

$216 Cheap Flights from Seattle to Sofia in 2026

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8:17 am - 6:00 pm

SEA

SOF

23h 43m2 stops

2:35 pm - 7:03 pm

SOF

SEA

38h 28m2 stops

$474Multiple Airlines

Thu, Feb 19 - Thu, Feb 26

8:17 am - 6:00 pm

SEA

SOF

23h 43m2 stops

7:05 pm - 1:20 pm

SOF

SEA

28h 15m1 stop

$479Multiple Airlines

Thu, Feb 19 - Thu, Feb 26

7:00 am - 1:15 pm

SEA

SOF

20h 15m2 stops

2:00 pm - 1:20 pm

SOF

SEA

33h 20m1 stop

$487Lufthansa

Tue, Feb 3 - Tue, Feb 10

3:10 pm - 10:45 pm

SEA

SOF

21h 35m1 stop

6:05 am - 1:20 pm

SOF

SEA

17h 15m1 stop

$489Lufthansa

Wed, Feb 11 - Fri, Feb 20

3:10 pm - 10:45 pm

SEA

SOF

21h 35m1 stop

6:10 am - 7:03 pm

SOF

SEA

22h 53m2 stops

$494Lufthansa

Wed, Feb 11 - Fri, Feb 20

6:50 pm - 11:10 pm

SEA

SOF

18h 20m1 stop

6:20 am - 12:20 pm

SOF

SEA

16h 00m1 stop

$496Lufthansa

Wed, Apr 1 - Wed, Apr 8

9:55 am - 1:55 pm

SEA

SOF

19h 00m2 stops

7:00 am - 8:00 pm

SOF

SEA

23h 00m2 stops

$500Multiple Airlines

Tue, Mar 24 - Tue, Apr 28

5:20 pm - 10:45 pm

SEA

SOF

20h 25m2 stops

6:10 am - 6:35 pm

SOF

SEA

22h 25m2 stops

$502United Airlines

Tue, Mar 24 - Tue, Apr 28

1:40 pm - 1:55 pm

SEA

SOF

14h 15m1 stop

7:00 am - 11:40 am

SOF

SEA

14h 40m1 stop

$504Multiple Airlines

Thu, Feb 19 - Thu, Feb 26

7:00 am - 1:50 pm

SEA

SOF

20h 50m2 stops

6:10 am - 8:56 pm

SOF

SEA

24h 46m2 stops

$508Lufthansa

Wed, Feb 11 - Fri, Feb 20

KLM flights from Seattle to Sofia

Our best KLM deals on Seattle to Sofia flight tickets

KLM

Feb 21

SEA8:30 amSeattle/Tacoma Intl

19h 35m

2 stops

SOF2:05 pmSofia

Feb 28

SOF7:00 amSofia

14h 40m

1 stop

SEA11:40 amSeattle/Tacoma Intl

$506

Find similar

KLM

Feb 21

SEA7:30 amSeattle/Tacoma Intl

20h 35m

2 stops

SOF2:05 pmSofia

Feb 28

SOF7:00 amSofia

23h 46m

2 stops

SEA8:46 pmSeattle/Tacoma Intl

$523

Find similar

KLM

Feb 12

SEA8:00 amSeattle/Tacoma Intl

20h 05m

2 stops

SOF2:05 pmSofia

Feb 17

SOF7:00 amSofia

14h 40m

1 stop

SEA11:40 amSeattle/Tacoma Intl

$524

Find similar

Lufthansa flights from Seattle to Sofia

Our best Lufthansa deals on Seattle to Sofia flight tickets

Lufthansa

Feb 3

SEA7:00 amSeattle/Tacoma Intl

20h 15m

2 stops

SOF1:15 pmSofia

Feb 10

SOF2:00 pmSofia

33h 20m

1 stop

SEA1:20 pmSeattle/Tacoma Intl

$487

Find similar

Lufthansa

Feb 11

SEA3:10 pmSeattle/Tacoma Intl

21h 35m

1 stop

SOF10:45 pmSofia

Feb 20

SOF6:05 amSofia

17h 15m

1 stop

SEA1:20 pmSeattle/Tacoma Intl

$489

Find similar

Lufthansa

Feb 11

SEA3:10 pmSeattle/Tacoma Intl

21h 35m

1 stop

SOF10:45 pmSofia

Feb 20

SOF6:10 amSofia

22h 53m

2 stops

SEA7:03 pmSeattle/Tacoma Intl

$494

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Thu 2/19

8:17 am-6:00 pm

2 stops23h 43m

Sofia

Thu 2/26

2:35 pm-7:03 pm

2 stops38h 28m

$474

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Thu 2/19

8:17 am-6:00 pm

2 stops23h 43m

Sofia

Thu 2/26

7:05 pm-1:20 pm

1 stop28h 15m

$479

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 2/3

7:00 am-1:15 pm

2 stops20h 15m

Sofia

Tue 2/10

2:00 pm-1:20 pm

1 stop33h 20m

$487

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 2/11

3:10 pm-10:45 pm

1 stop21h 35m

Sofia

Fri 2/20

6:05 am-1:20 pm

1 stop17h 15m

$489

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 2/11

3:10 pm-10:45 pm

1 stop21h 35m

Sofia

Fri 2/20

6:10 am-7:03 pm

2 stops22h 53m

$494

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 4/1

6:50 pm-11:10 pm

1 stop18h 20m

Sofia

Wed 4/8

6:20 am-12:20 pm

1 stop16h 00m

$496

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 3/24

9:55 am-1:55 pm

2 stops19h 00m

Sofia

Tue 4/28

7:00 am-8:00 pm

2 stops23h 00m

$500

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Tue 3/24

5:20 pm-10:45 pm

2 stops20h 25m

Sofia

Tue 4/28

6:10 am-6:35 pm

2 stops22h 25m

$502

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Thu 2/19

1:40 pm-1:55 pm

1 stop14h 15m

Sofia

Thu 2/26

7:00 am-11:40 am

1 stop14h 40m

$504

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 2/11

7:00 am-1:50 pm

2 stops20h 50m

Sofia

Fri 2/20

6:10 am-8:56 pm

2 stops24h 46m

$508

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 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 $587, 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 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 $785 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 $705 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

Fastest flight time	20h 05m
Direct flights	None

The fastest flight from Seattle to Sofia takes 20h 05m

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

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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 20h 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 5 as of January 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 Turkish Airlines, making up 46% of the total bookings. Other popular airlines include Lufthansa with 33%, KLM with 12%, 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
Lufthansa	PriceFrom $541	Free Cancellation	Rating 6.8 7,690 reviews	Search Lufthansa flights
Air France	PriceFrom $555	Free Cancellation	Rating 7.4 1,519 reviews	Search Air France flights
Turkish Airlines	PriceFrom $587	Free Cancellation	Rating 7.3 4,152 reviews	Search Turkish Airlines flights
KLM	PriceFrom $615	Free Cancellation	Rating 7.7 1,434 reviews	Search KLM flights
United Airlines	PriceFrom $621	Free Cancellation	Rating 7.4 9,138 reviews	Search United 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

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Cheap flights from Seattle to Sofia from $216

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 5/3. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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KLM flights from Seattle to Sofia

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How to get the cheapest flight ticket from Seattle to Sofia

What is the cheapest month to fly to Sofia?

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

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

British Airways, Lufthansa, and KLM are the most popular carriers operating from Seattle/Tacoma Intl to Sofia

What airlines fly to Sofia?

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

Istanbul (IST) was the most common stop: 71% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $739.

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

Flights connecting via Munich (MUC) have the shortest average one-way travel time: 13h 50m.

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

Munich (MUC) has the shortest average layover time for this route: 2h 00m.

When to book flights from Seattle to Sofia

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

Fastest flight time

Direct flights

How far is Seattle/Tacoma Intl to Sofia by plane?

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

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

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

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

What is the most popular airline 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?

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

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

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

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

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