IAD - SOF

$317 Find Cheap Flights from Washington Dulles Airport to Sofia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Dulles Intl to Sofia departing on 7/7. 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, 0 bags

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 Washington, D.C. 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 Washington, D.C. to Sofia, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest round-trip
$538
Typical prices: $685-$1,042
Turkish Airlines
Thu 4/9Tue 4/21
IAD - SOF • 1 stop
Cheapest one-way
$317
British Airways
Tue 7/7
IAD - SOF • 1 stop
Top airlines
Cheapest • from $538 (round-trip)
Best reviews • 7.6 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Dulles Intl and Sofia. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Cheapest • Avg $617 (round-trip)
Shortest trip • 11h 54m (one-way)
Insights
Insights
Insights
Insights
When to book
in advance
Our data shows that travelers who book at least 3 weeks in advance save around 44% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
Cheapest • 28% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sofia!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Dulles Intl to Sofia (IAD-SOF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Dulles Intl 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 Dulles Intl to Sofia

Thu, Apr 9 - Tue, Apr 21
Turkish Airlines Logo
1:20 pm - 1:15 pm
IAD
-
SOF
16h 55m
1 stop
Turkish Airlines Logo
3:50 pm - 11:35 am
SOF
-
IAD
26h 45m
1 stop
$538Turkish Airlines
Wed, May 6 - Wed, May 20
Turkish Airlines Logo
1:20 pm - 3:00 pm
IAD
-
SOF
18h 40m
1 stop
Turkish Airlines Logo
9:35 am - 7:50 pm
SOF
-
IAD
17h 15m
1 stop
$540Turkish Airlines
Thu, Apr 16 - Thu, Apr 30
Turkish Airlines Logo
1:20 pm - 1:15 pm
IAD
-
SOF
16h 55m
1 stop
Turkish Airlines Logo
3:50 pm - 7:50 pm
SOF
-
IAD
35h 00m
1 stop
$541Turkish Airlines
Tue, Sep 8 - Tue, Sep 22
Turkish Airlines Logo
1:20 pm - 8:45 am
IAD
-
SOF
12h 25m
1 stop
Turkish Airlines Logo
9:05 pm - 11:35 am
SOF
-
IAD
21h 30m
1 stop
$548Turkish Airlines
Tue, Sep 8 - Tue, Sep 22
Turkish Airlines Logo
9:45 pm - 3:00 pm
IAD
-
SOF
34h 15m
1 stop
Turkish Airlines Logo
9:05 pm - 11:35 am
SOF
-
IAD
21h 30m
1 stop
$549Turkish Airlines
Tue, Sep 8 - Tue, Sep 22
Turkish Airlines Logo
1:20 pm - 8:45 am
IAD
-
SOF
12h 25m
1 stop
Turkish Airlines Logo
3:50 pm - 7:50 pm
SOF
-
IAD
35h 00m
1 stop
$550Turkish Airlines
Mon, Aug 17 - Wed, Sep 16
Turkish Airlines Logo
9:45 pm - 8:15 pm
IAD
-
SOF
15h 30m
1 stop
Turkish Airlines Logo
9:35 am - 11:35 am
SOF
-
IAD
33h 00m
1 stop
$556Turkish Airlines
Wed, Aug 19 - Tue, Sep 15
Turkish Airlines Logo
9:45 pm - 8:45 am
IAD
-
SOF
28h 00m
1 stop
Turkish Airlines Logo
9:35 am - 11:35 am
SOF
-
IAD
33h 00m
1 stop
$557Turkish Airlines
Thu, Apr 30 - Thu, May 7
Turkish Airlines Logo
9:45 pm - 8:45 am
IAD
-
SOF
28h 00m
1 stop
Turkish Airlines Logo
3:50 pm - 7:50 pm
SOF
-
IAD
35h 00m
1 stop
$558Turkish Airlines
Thu, Apr 23 - Mon, Apr 27
Turkish Airlines Logo
1:20 pm - 1:15 pm
IAD
-
SOF
16h 55m
1 stop
Turkish Airlines Logo
9:35 am - 7:50 pm
SOF
-
IAD
17h 15m
1 stop
$561Turkish Airlines
Booking Insights

KAYAK's insights & trends for Dulles Intl to Sofia flights

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

How much is a round-trip flight from Washington, D.C. Dulles Intl Airport to Sofia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. Dulles Intl Airport to Sofia departing in April.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Sofia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport to Sofia is February, where tickets cost $566 (return) on average. On the other hand, the most expensive months are December and June, where the average cost of round-trip tickets is $1,053 and $905 respectively.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport 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 Washington, D.C. Dulles Intl Airport to Sofia, you should book around 3 weeks before departure, which saves you about 44% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$317
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 15% increase in price.
Flight from Washington Dulles Airport to Sofia

When to book flights from Dulles Intl to Sofia

Are your dates flexible? Find out the best times to travel from Dulles Intl 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 Washington Dulles Airport to Sofia flights

  • What is the cheapest flight from Washington, D.C. Dulles Intl Airport to Sofia?

    In the last 3 days, the lowest price for a flight from Washington, D.C. Dulles Intl Airport to Sofia was $317 for a one-way ticket and $538 for a round-trip.

  • Do I need a passport to fly between Washington Dulles Airport and Sofia?

    Yes, you'll most likely have to show a valid passport before boarding the plane in Washington Dulles Airport and on arrival in Sofia.

  • Which airports will I be using when flying from Washington Dulles Airport to Sofia?

    When flying out of Washington Dulles Airport you will be using Washington, D.C. Dulles Intl. You will be landing at Sofia, also known as Sofia.

  • Which aircraft models fly most regularly from Washington Dulles Airport to Sofia?

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

  • Which airline alliances offer flights from Washington Dulles Airport to Sofia?

    Star Alliance is the only airline alliance operating flights between Washington Dulles Airport and Sofia.

  • Which is the best airline for flights from Washington, D.C. to Sofia, Austrian Airlines or United Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Sofia are Austrian Airlines and United Airlines. With an average price for the route of $1,084 and an overall rating of 7.6, Austrian Airlines is the most popular choice. United Airlines is also a great choice for the route, with an average price of $855 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Washington Dulles Airport 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 Washington Dulles Airport to Sofia.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Washington Dulles Airport 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 Washington Dulles Airport 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 Washington Dulles Airport with another airline. Booking your flights between Washington Dulles Airport 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 Washington Dulles Airport 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 Washington Dulles Airport 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 Dulles Intl to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. 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 Dulles Intl 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.
7.6
Austrian AirlinesOverall score based on 900 reviews
7.3Comfort
7.6Boarding
8.1Crew
6.8Entertainment
6.8Food
Airline reviews

We were delayed three hours from Montenegro to Vienna on our outbound flight and then rebooked an extra leg on our trip to the US. Our bags, which Austrian made us check in in Montenegro even though the flight was barely half full, didn't find us for ten days. Then, when we asked for compensation for the delay we were given the runaround that the flight originated outside of the EU. Next time we fly Turkish Air.

8.0 ExcellentNate, Jan 2026
IAD - VIE
Read more Austrian Airlines reviews

We were delayed three hours from Montenegro to Vienna on our outbound flight and then rebooked an extra leg on our trip to the US. Our bags, which Austrian made us check in in Montenegro even though the flight was barely half full, didn't find us for ten days. Then, when we asked for compensation for the delay we were given the runaround that the flight originated outside of the EU. Next time we fly Turkish Air.

My Austrian Air flight from Montenegro to Vienna was delayed by three hours because their plane de-icer was broken and they had to wait for the sun to come up before the ice could melt. This meant we missed our United flight altogether. So I can't speak about United, but I was not impressed by Austrian Air. They made us check in two carry on bags for a 60% full flight, and the bags didn't find us in the US for ten days. The re-routing they arranged included an extra leg, a midnight taxi ride across New Jersey and New York, and a five hour sleep in a hotel. Not impressed.

Excellent flight. The crew was exceptionally attentive and organized. Attention to details is unmatched.

Loved the courtesy and punctuality. Very professional and most importantly on time.

My layover in Vienna was supposed to be 35 minutes but because my flight was canceled I had to wait in the airport for an additional 8 hours.

Very limited legroom in a 10 hour flight.very old plane.

They had me unpack a handbag 2 lbs overweight into another handbag 8 lbs underweight for a Bible.

My flight was canceled and even though I paid אם KAYAK you didn't even answer me and obviously didn't refund my money. I will never buy a ticket through you again.

Despite the booked seats in front of the land we were moved to the back of the plane even first like 8 lines were totally without pasangers. When I tried to sit on empty seat flight attendant asked me to go to my dedicated seat in the fully crowded back of the plane. She was not able to explain why. Food was very poor on flight LAX - VIE.

We had a wonderful experience overall. The only issue was check-in our luggage at the Split Airport counter. It was very confusing because we needed to pay for baggage.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Wifi took a while to kick in and we had a maintenance issue that took over 40 mins at the gate in Washington before pulling back

Very good. Because of the delays with my previous flight, I missed my connection, but I was able to book another flight through the United app easily.

Was happy we finally got upgraded in 1st class. The seat getting old. The cushiness need some improvement.

Ineffective communication with United resulted in lost baggage. Their Baggage Tracing counter at MUC was shut down from 11:00-14:15 on my arrival. Undertrained, underinformed staff had me Running all over MUC to find someone to help me to no avail. Staff was rude, unhelpful, and unable to effectively use the systems they did have operational. They refused to contact United in any way or provide any accommodation or other resources while I waited for my luggage. This has destroyed my downstream itinerary. If they had even the slightest visibility I may have been able to reschedule/plan, but again, their staff provided nothing, and did nothing more than their website, which doesn’t even work on a standard phone browser. Miserable failure at all levels that weren’t associated with the operation of the aircraft.

Sat next to a one year old. She crawled all over the place and made me laugh.

The Crew and the food was the worst I ever had in Business Class. First they told us there were no space for carry on. It was plenty of space over our 2 row seats, we had to ask to let us travel with it which was accepted. They were aware that we had to run for the connection due to the previous flight delay. Have us one hour waiting for more customers and not even offer a glass of water. Then started the service and they started to serve other passengers drinks in business and did not offer any drinks until they serve our pre ordered meal and I ask for something to drink. I had to wait until they finished to serve all passengers until Inget something. The crew was the worts I ever had for Business Class in my life.

Not great experience - we were super late boarding due to issues with aircraft. Then when we finally all got onboard and seated and they started taxiing out to the runway they just stopped then turned around and went back to the airport. Apparently the crew “ran out of time” to legally fly us. They mentioned that they were about 2 minutes away from taking off. I understand the rules and safety but kinda wonder why they would have bothered boarding us in the first place? Had to go all the way back and de plane and then wait in a HUGE line to get a hotel (this is somewhere around 2:30am) finally got to hotel by Uber (no shuttle after 20min so gave up) and they ended up putting us all back on the same aircraft at 10am next morning so got about 2.5 hours sleep. They did give us. $250 credit, but it was a São Paulo Brazil flight out of Dulles. The flight and everything was fine.

Starlink wifi on the Embraer E175 is an excellent experience. I was able to connect and work from IAD all the way to approach into BTV.

7 hours delayed due to operational issues on United’s end. Basically laziness.

IAH to Istanbul was outstanding across the board. The flight from Istanbul to Male was good, not great.

the cabin was kept too hot. couldn't sleep as a result

It was an amazing experience. Flight crew's service, hospitality, and the food were phenomenal. I don't think I'd want to try any other airline company after this. I would definitely recommend to friends and family. Thank you Turkish Airlines !

Business Class pods are horrible. If you're petite, you might be able to sleep on the uncomfortable seat and bed. Crew and food are fantastic.

I have travelled many times on Turkish, but they always board at least 30-40 minutes past the stated time. If informed properly, passengers can choose to spend more time in the .lounge instead of standing around by the gate waiting to board. The new lounge at DFW was a big disappointment. The aircraft itself was a shock. In the past I have flown this sector with regular business class seating configuration of 1-2-1, The 2-3-2 seating is very disappointing after paying such high prices for tickets. The DFW to Istanbul segment was slightly better, but the Istanbul to Delhi segment was no better than premium economy. I will try to travel more on airlines which give business class passengers more value for their money.

Good overall. Seat spacing a bit tight between IST and ISB.

Excellent staff despite some trying passenger situations. Very impressed with their good attitudes and kindness.

Crew were unfriendly, touch screen for movies didn't work very well, seats were tight and uncomfortable

After arriving in Istanbul, the transit information on the electronic board showed a tight departure time, and the gate changed in the middle, making it difficult to make it on time.

Typically good service onboard but baggage delay in airport was significant

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Economy Priority seats are extremely uncomfortable. There is no way to escape the boxed in feeling, particularely because the distance between to rows are too short, the hard edge of the front row is keeping legs confined. There is no elevated place to put your feet. I am of average, European size.

Terrible. Both flights were significantly delayed, no luggage, made me check my small bag when many, many others had much larger carry-ons, not even a bottle of water . . . I will not fly Discover Airlines again.

I was deceived on the Kayak site expecting a ticket, but instead finding a "standby" reservation. When I tried to change the ticket, I paid almost twice the price of the original ticket. Then, the airline refused to give me the reserved seat I had chosen and paid for. I think I deserve a refund for this leg of my trip because I was doubly charged and did not receive what I had paid for. I put in a complaint with Lufthansa because the ticket was sold originally sold as a flight they listed. Someone here needs to take responsibility.

Excellent service; they helped me reschedule so I can fly in an earlier flight

I had a good comfortable seat. There was nearly an hour delay. There was an accident with the champagne, but I was well compensated. These things happen sometimes.

Everything you need to know for your flight from Dulles Intl to Sofia

Information on your arrival and departure airports