SEA - SOF

$532 Find Cheap Flights from Seattle to Sofia

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Sofia departing on 10/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Sofia

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Sofia, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Sofia, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Seattle to Sofia (SEA-SOF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Sofia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Sofia

Sun, Oct 19 - Tue, Nov 4
Lufthansa Logo
6:50 pm - 6:40 pmSEA-SOF
13h 50m1 stop
Lufthansa Logo
6:00 am - 12:10 pmSOF-SEA
16h 10m1 stop
$532Lufthansa
Find Deal
Sun, Oct 19 - Tue, Nov 4
Lufthansa Logo
6:50 pm - 6:40 pmSEA-SOF
13h 50m1 stop
Lufthansa Logo
6:05 am - 12:10 pmSOF-SEA
16h 05m2 stops
$552Lufthansa
Find Deal
Wed, Nov 5 - Wed, Nov 12
Turkish Airlines Logo
7:00 pm - 3:10 pmSEA-SOF
34h 10m1 stop
Turkish Airlines Logo
4:00 pm - 5:05 pmSOF-SEA
35h 05m1 stop
$561Turkish Airlines
Find Deal
Tue, Nov 4 - Mon, Nov 17
British Airways Logo
1:25 pm - 8:10 pmSEA-SOF
20h 45m1 stop
British Airways Logo
5:25 pm - 11:30 amSOF-SEA
28h 05m1 stop
$568British Airways
Find Deal
Thu, Nov 6 - Wed, Nov 19
Turkish Airlines Logo
7:00 pm - 3:10 pmSEA-SOF
34h 10m1 stop
Turkish Airlines Logo
9:40 pm - 5:05 pmSOF-SEA
29h 25m1 stop
$570Turkish Airlines
Find Deal
Sat, Nov 8 - Fri, Nov 21
Air Canada Logo
8:00 pm - 6:20 pmSEA-SOF
36h 20m2 stops
Air Canada Logo
6:10 am - 10:06 pmSOF-SEA
25h 56m2 stops
$571Air Canada
Find Deal
Sun, Feb 1 - Fri, Feb 20
Air Canada Logo
5:50 am - 6:20 pmSEA-SOF
26h 30m2 stops
Air Canada Logo
6:10 am - 9:31 amSOF-SEA
37h 21m2 stops
$573Air Canada
Find Deal
Wed, Nov 5 - Fri, Nov 21
United Airlines Logo
2:40 pm - 10:45 pmSEA-SOF
22h 05m2 stops
United Airlines Logo
6:10 am - 12:10 pmSOF-SEA
16h 00m1 stop
$575United Airlines
Find Deal
Tue, Feb 24 - Tue, Mar 17
United Airlines Logo
5:07 am - 6:20 pmSEA-SOF
27h 13m3 stops
United Airlines Logo
6:00 am - 1:10 pmSOF-SEA
16h 10m1 stop
$578United Airlines
Find Deal
Fri, Nov 7 - Mon, Nov 17
British Airways Logo
6:50 pm - 1:00 pmSEA-SOF
32h 10m1 stop
British Airways Logo
5:25 pm - 11:30 amSOF-SEA
28h 05m1 stop
$618British Airways
Find Deal

Everything you should know

Top airlines
Lufthansa
Cheapest • from $532 (round-trip)
KLM
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
2 weeks
in advance
Our data shows that travelers who book at least 2 weeks in advance save around 26% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
January
Cheapest • 32% price drop
July
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$532
Overall average: $784
Lufthansa
Sun 10/19Tue 11/4
SEA - SOF • 1 stop
Cheapest one-way
Multiple Airlines
Wed 9/17
SEA - SOF • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sofia!
Booking Insights

KAYAK's insights & trends for Seattle to Sofia flights

Get data-powered insights and trends into flights from Seattle to Sofia to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Seattle to Sofia?

The average price of all round-trip flights from Seattle to Sofia clicked on KAYAK for each day over the last 12 months.

For Seattle to Sofia, Saturday is the cheapest day to fly on average and Friday is the most expensive. Flying from Sofia back to Seattle, the best deals are generally found on Sunday, with Friday being the most expensive.

What is the cheapest month to fly from Seattle to Sofia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Sofia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Sofia is January, where tickets cost $602 (return) on average. On the other hand, the most expensive months are December and May, where the average cost of round-trip tickets is $1,364 and $1,088 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Seattle to Sofia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Seattle to Sofia, you should book around 2 weeks before departure, which saves you about 26% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 26 weeks before departure.

Good to know

Low seasonJanuary
Cheapest flight$532
Best time to beat the crowds with an average 32% drop in price.
Most popular time to fly and prices are also 0% lower on average.
Flight from Seattle to Sofia

When to book flights from Seattle to Sofia

Are your dates flexible? Find out the best times to travel from Seattle to Sofia based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Seattle to Sofia

  • What is the cheapest flight from Seattle to Sofia?

    In the last 3 days, the lowest price for a flight from Seattle to Sofia was $532 for a round-trip ticket.

  • Do I need a passport to fly between Seattle and Sofia?

    Yes

  • Which airports will I be using when flying from Seattle to Sofia?

    On your way to Sofia, you’ll fly out from Seattle/Tacoma Intl. You’ll be landing at Sofia.

  • Which aircraft models fly most regularly from Seattle to Sofia?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Seattle to Sofia?

    Star Alliance, and oneworld are the airline alliances operating flights between Seattle and Sofia, with Star Alliance being the most commonly used for this route.

  • What is the most popular layover when flying to Sofia from Seattle?

    Istanbul is the most popular layover city among KAYAK users traveling from Seattle to Sofia.

  • Which is the best airline for flights from Seattle to Sofia, KLM or United Airlines?

    The two airlines most popular with KAYAK users for flights from Seattle to Sofia are KLM and United Airlines. With an average price for the route of $942 and an overall rating of 7.8, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $885 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Seattle to Sofia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Sofia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Sofia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Sofia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Sofia with an airline and back to Seattle with another airline. Booking your flights between Seattle and SOF can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Sofia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Sofia from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 4 airlines serving from Seattle to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Sofia. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Sofia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1386 reviews
7.8Boarding
8.4Crew
7.3Food
7.7Comfort
7.2Entertainment
Airline reviews

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

10.0 ExcellentCameron, Sep 2025YYJ - YYC
Read more KLM reviews

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

We had to deboard 2 times due to maintenance issues. They changed the plane, and then we got deviated to LAX due to maibtenance issues on the other plane, had to sleep at LAX and los a full day.

Everything was good, except the seats in economy were so close together, you could barely get out when the seat in front of your was reclined. If the airlines keep jamming in more and more seats, it will become intolerable. I will look for another airline that considers customer comfort and does not keep adding more rows of seats for more profit.

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Flight was good and crew was super polite. However, there were around 5 kids screaming the WHOLE 2 hours. I understand kids have to come but parents need to do something to control their children. They make the experience terrible, especially after finishing 16 hour shifts at the hospital I needed some sleep, which I did not get.

IAD with the archaic people movers is just a place to be avoided.

Great service on board. Boarding a bit slow due to process. Food was pretty average.

Tastless food and too obvious lack of enthusiasm for service in the economy vesus business class

All of the United employees I interacted with were professional and courteous. The aircraft was clean, the food on the flight was good. No complaints here.

I had no checked baggage but was required to hand over carry on baggage at the door of the plane. There was a lot of overboard space in the plane and I was one of the last ones. I ran to get my carry on but it was gone. I was given back at the plane door in Toronto, so the wait was not as long as it would have been at the carousel.

Armrest controller on my seat 35D and nextbooennseat 35E did not work right. Hard to press buttons to recognize and 35D had constantnpressure either upmost down somit was nearly impossible to make selections. .

Rude staff. I would avoid using the word racist but definitely partially or discriminatory. My 72 yrs old mother who is also disabled was traveling on this flight. She was the second passenger boarded to the plane. The First elderly couple ahead of my mother were allowed to use the airplane bathroom but my mother was denied entry stating it was for safety reasons. My mother objected the the couple in front of her were allowed but hostess still stated that due to the flight safety reasons she can’t use it. Even my mother explained that he is using blood pressure medication that’s why she have to use the restroom frequently but the crew continued arguing her. At one point the Mae attendent even suggested that if that’s the case my mother can urinate in her seat. The level of disrespect against an elderly lady is beyond my comprehension. This matter will be taken to the social media to shame the employees involved.

my experience was great with Turkish airlines . the problem i encountered was with kayak booking. When I booked . it showed that im allowed a bag . and when I got to the airport, i had to pay $165 for one bag.

Not up to Business Class standards. Two of the three toilets were out of order. The hostesses were aware and didn’t show any responsible act to do something. Food quality was not what we expect from Turkish hospitality. Overall we were not impressed and disappointed.

During mid flight, try to get a flight attendant to help I couldn’t find one Otherwise, everything was perfect

I was not given basinett seat.The connecting flight was missed due to airline fault i was not accomodated for hotel.Drinks were normt served frewuently.Never travelling again on tirkish airlines.I always travel wiyh family by turkish airline but no more.zero stars

The crew were very hospitable and pleasant. The food was pretty good. Unfortunately, there was a flight delay of more than 2 hours. We're not sure why but it appeared to be outside the control of Turkish Airlines.

Bough tickets with luggage, but made me pay at Airport as well

The economy seat was so uncomfortable, had not enough leg room for 13 hours flight, front seat basket was broken and couldn’t hold anything, food quality was horrible( we got food poisoned ) we charged for logged which used to be free. We paid too much for this flight and very disappointed. Turkish air line better to make satisfy and respect people instead of find different way to scam people.

This is really the rating of two flights. JFK to IST then IST to NQZ. New York to Istanbul was good. Good crew and all positives. The flight to Astana was so bad that brought it all down. Crew was nonexistent above the minimum, seats were cramped, and it was hot on the plane. Turkish Airlines seems to be slipping down to US based carriers level.

The 2 agents on the check in counter were super nice , helpful and very polite. Boarding was like a 1 2 3, I would recommend Turkish airlines for your next trip.

I liked Quiet people around me. Crew could have helped people with overhead luggage so they aren't moving other peoples bags around and causing problems for people that had there bags there first

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

Everything you need to know for your flight from Seattle to Sofia

Information on your arrival and departure airports

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