IAD - SOF

$328 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 7/28. 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
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Everything you should know

Cheapest round-trip
$667
Typical prices: $840-$674
Turkish Airlines
Tue 9/8Tue 9/22
IAD - SOF • 1 stop
Cheapest one-way
$328
Typical prices: $647-$878
British Airways
Tue 7/28
IAD - SOF • 1 stop
Top airlines
Cheapest • from $667 (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 $710 (round-trip)
Shortest trip • 11h 00m (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 56% 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

Tue, Sep 8 - Tue, Sep 22
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
$667Turkish Airlines
Thu, Aug 27 - Thu, Sep 10
Turkish Airlines Logo
1:20 pm - 3:00 pm
IAD
-
SOF
18h 40m
1 stop
Turkish Airlines Logo
3:50 pm - 11:35 am
SOF
-
IAD
26h 45m
1 stop
$668Turkish Airlines
Thu, Aug 20 - Tue, Sep 15
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
$704Turkish Airlines
Mon, Oct 26 - Mon, Nov 9
Turkish Airlines Logo
10:10 pm - 8:50 pm
IAD
-
SOF
16h 40m
1 stop
Turkish Airlines Logo
9:40 pm - 7:15 pm
SOF
-
IAD
28h 35m
1 stop
$705Turkish Airlines
Mon, Oct 26 - Mon, Nov 9
Multiple Airlines Logo
9:45 am - 1:45 pm
IAD
-
SOF
22h 00m
2 stops
Multiple Airlines Logo
3:00 pm - 4:40 pm
SOF
-
IAD
32h 40m
1 stop
$718Multiple Airlines
Sun, Sep 27 - Sun, Oct 11
Turkish Airlines Logo
9:45 pm - 8:15 pm
IAD
-
SOF
15h 30m
1 stop
Turkish Airlines Logo
2:05 pm - 11:35 am
SOF
-
IAD
28h 30m
1 stop
$722Turkish Airlines
Sun, Aug 30 - Sun, Sep 13
Turkish Airlines Logo
1:20 pm - 8:15 pm
IAD
-
SOF
23h 55m
1 stop
Turkish Airlines Logo
2:05 pm - 11:35 am
SOF
-
IAD
28h 30m
1 stop
$723Turkish Airlines
Wed, Sep 2 - Tue, Sep 22
Turkish Airlines Logo
9:45 pm - 8:45 am
IAD
-
SOF
28h 00m
1 stop
Turkish Airlines Logo
3:50 pm - 11:35 am
SOF
-
IAD
26h 45m
1 stop
$731Turkish Airlines
Fri, Aug 21 - Mon, Sep 14
Turkish Airlines Logo
1:20 pm - 8:15 pm
IAD
-
SOF
23h 55m
1 stop
Turkish Airlines Logo
3:50 pm - 7:50 pm
SOF
-
IAD
35h 00m
1 stop
$742Turkish Airlines
Mon, Aug 31 - Sun, Sep 20
Turkish Airlines Logo
9:45 pm - 8:15 pm
IAD
-
SOF
15h 30m
1 stop
Turkish Airlines Logo
9:05 pm - 11:35 am
SOF
-
IAD
21h 30m
1 stop
$743Turkish 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 September.

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 $1,112 and $1,038 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 56% 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$328
Best time to beat the crowds with an average 29% drop in price.
Most popular time to fly with an average 31% 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 $328 for a one-way ticket and $667 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 Turkish Airlines?

    The two airlines most popular with KAYAK users for flights from Washington, D.C. to Sofia are Austrian Airlines and Turkish Airlines. With an average price for the route of $1,125 and an overall rating of 7.6, Austrian Airlines is the most popular choice. Turkish Airlines is also a great choice for the route, with an average price of $651 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 913 reviews
6.8Food
6.8Entertainment
7.6Boarding
8.1Crew
7.3Comfort
Airline reviews

Last few years I didn't not have great experience with United Airlines.

2.0 MediocreAnonymous, Apr 2026
IAD - PHX
Read more Austrian Airlines reviews

Last few years I didn't not have great experience with United Airlines.

Booked economy. Seat felt like it was a bit more roomy than my last trans Atlantic flights. I had a nice person sitting next to me. Everything was as good as it could be considering you are 35,000 feet up in the air and in a metal container. Beers, wine, food were all readily available. Plenty of movies and shows to watch. Friendly flight staff

Short flight. Bare bones and kinda seeming like an older plane. But got me there on time and that's what counts. Perfectly fine flight all the way from start to finish.

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.

The ground crew members at check in counter were courteous. The boarding was seamless. Flight departed as scheduled. Service on board was great

Very comfortable in business class. Excellent service. Good food. Smooth trip.

The seats seems abit small and the reclining is too much, the seat in front of me came back too much and made it uncomfortable for me.

As a first time flyer with Turkish Airlines. My experience was very good due to the factor that there were to many passengers on the my first flight compared to my connecting flight. However, I know that nothing is perfect and all companies are trying to accommodate their passengers to the best way possible. I will always say, a FEW INCHES will go LONG WAY. That's something all airliners should consider, and not only the money aspect!!! A long time commitment is better than one time service! Thank you

Flight was delayed. While standing at the gate, a note appeared on the sign saying the gate had changed to a gate far away. No member of the Turkish airlines team got on the microphone to instruct passengers to go to the other gate, to ignore the chiron, etc. Finally, the message disappeared. Eventually, the flight began to board. Very slowly. More slowly than I experience with other airlines. Though Istanbul may just be slow . . . In all other ways, great flight, great entertainment (top notch movies), great service, excellent food, comfortable lie-flat seat, dimmed lights, etc.

Staff at the airport wasn't helpful or friendly. Probably the worst airport experience I have ever had, going and coming. The staff on the plane was better. Still not super friendly or personable. However, they were not rude like airport staff. They ran out of certain menu items. Maybe could have been prepared better? Overall just ok.

It was a pleasant experience. In flight entertainment could have been better

The desk crew at the LAX crew could do better. A girl named Mahesi was very abrasive and unfriendly. She needs a better customer service uproar.

It was peaceful excited We enjoyed it always Turkish peaceful excited

Istanbul to Lahore flight was less than standard for international business class cabins. Seat did not were not flat and it did not operate easily. I had to push buttons hard repeatedly to operate the seat. I was in 5A seat

Vegetarian selection could be better. Bread was too hard to chew.

Crew was friendly and competent. Food, wine, and entertainment were excellent except the raw tuna on the flight to Split. Recommend against serving that - at least as the only option. Many medical conditions do not allow people to eat raw fish.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

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.

Flight was delayed by several hours and then cancelled due to weather. But Staff was very helpful getting me on a different flight. United should offer food coupons and tooth brush and paste for stranded passengers

I upgraded to the business class cabin. It was the poorest business class I have ever experienced. No access to any business lounge in Tampa airport. Seats are not comfortable. I had a window seat and had to step/crawl over the next seat. Food was mediocre and service below average for business class. Bathroom location was ridiculous. No place to wait. I cannot believe I paid this kind of money and will never fly Lufthansa Discover again. They really should reimburse me somehow.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

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.

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

Information on your arrival and departure airports