HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Sofia

$439+ Cheap flights from Dulles Intl (IAD) to Sofia (SOF)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — SOF
may. 4 — may. 111
dom. 5/4
dom. 5/11
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to Sofia with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Sofia are usually found in January or March, booked 44 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Dulles Intl to Sofia

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Sofia (SOF). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated abril 29, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$755
(United Airlines)

One-way from

$439
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$875
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Sofia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Sofia flights.
Search Deals
From Washington, D.C. Dulles Intl to Sofia
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Sofia
Search Deals
Highest demand for flights based on searches. 20% potential increase in price ($220 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($33 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Dulles Intl to Sofia

Cheapest flights from Dulles Intl to Sofia
Explore the most affordable flight options available from Dulles Intl to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 29, 2025.

This United Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/209:00 amIAD - SOF
2 stops21h 20mUnited Airlines
jue. 8/216:15 amSOF - IAD
2 stops18h 15mUnited Airlines
Deal found 4/28$755
This Air Canada deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/81:00 pmIAD - SOF
2 stops14h 05mMultiple Airlines
dom. 10/1912:00 pmSOF - IAD
2 stops28h 38mMultiple Airlines
Deal found 4/28$788
This Gurufare deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 8/110:20 pmIAD - SOF
2 stops17h 30mLufthansa
dom. 8/246:00 amSOF - IAD
2 stops16h 50mLufthansa
Deal found 4/28$797
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/199:40 pmIAD - SOF
1 stop15h 45mTurkish Airlines
lun. 6/29:15 pmSOF - IAD
1 stop21h 30mTurkish Airlines
Deal found 4/28$798
This British Airways deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/1510:40 pmIAD - SOF
1 stop15h 00mBritish Airways
mié. 8/139:30 pmSOF - IAD
1 stop25h 25mBritish Airways
Deal found 4/28$806
This oojo deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 8/174:30 pmIAD - SOF
1 stop12h 35mITA Airways
mié. 8/2012:55 pmSOF - IAD
1 stop32h 45mITA Airways
Deal found 4/28$847
This American Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/410:40 pmIAD - SOF
1 stop31h 50mAmerican Airlines
mié. 6/119:30 pmSOF - IAD
1 stop25h 20mAmerican Airlines
Deal found 4/28$864
This Air Canada deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/412:40 pmIAD - SOF
2 stops15h 35mAir Canada
mié. 6/116:15 amSOF - IAD
2 stops21h 53mAir Canada
Deal found 4/28$879
This Austrian Airlines deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 7/205:25 pmIAD - SOF
1 stop23h 30mAustrian Airlines
lun. 8/46:55 pmSOF - IAD
1 stop26h 40mAustrian Airlines
Deal found 4/28$900
This SWISS deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 7/288:45 pmIAD - SOF
2 stops14h 55mSWISS
lun. 8/43:30 pmSOF - IAD
1 stop31h 45mSWISS
Deal found 4/28$910
This KLM deal was found by Cheapflights users on 4/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 6/312:20 pmIAD - SOF
2 stops18h 40mKLM
vie. 7/47:00 amSOF - IAD
1 stop15h 35mKLM
Deal found 4/28$947

Cheapflights Fare Finder

Customize your flight search to find flights from Dulles Intl to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated abril 29, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Sofia that are best for you.

Fly from

Dulles Intl

Fly to

Sofia

Route

Depart

Return

Price

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

mar. 5/20

9:00 am-1:20 pm

2 stops21h 20m

Sofia

jue. 8/21

6:15 am-5:30 pm

2 stops18h 15m

$755

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

mié. 10/8

1:00 pm-10:05 am

2 stops14h 05m

Sofia

dom. 10/19

12:00 pm-9:38 am

2 stops28h 38m

$788

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

vie. 8/1

10:20 pm-10:50 pm

2 stops17h 30m

Sofia

dom. 8/24

6:00 am-3:50 pm

2 stops16h 50m

$797

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

lun. 5/19

9:40 pm-8:25 pm

1 stop15h 45m

Sofia

lun. 6/2

9:15 pm-11:45 am

1 stop21h 30m

$798

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

mar. 7/15

10:40 pm-8:40 pm

1 stop15h 00m

Sofia

mié. 8/13

9:30 pm-3:55 pm

1 stop25h 25m

$806

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

dom. 8/17

4:30 pm-12:05 pm

1 stop12h 35m

Sofia

mié. 8/20

12:55 pm-2:40 pm

1 stop32h 45m

$847

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

mié. 6/4

10:40 pm-1:30 pm

1 stop31h 50m

Sofia

mié. 6/11

9:30 pm-3:50 pm

1 stop25h 20m

$864

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

mié. 6/4

12:40 pm-11:15 am

2 stops15h 35m

Sofia

mié. 6/11

6:15 am-9:08 pm

2 stops21h 53m

$879

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

dom. 7/20

5:25 pm-11:55 pm

1 stop23h 30m

Sofia

lun. 8/4

6:55 pm-2:35 pm

1 stop26h 40m

$900

Washington, D.C.Sofia

IAD - SOF

IADSOF

Washington, D.C. Dulles Intl

lun. 7/28

8:45 pm-6:40 pm

2 stops14h 55m

Sofia

lun. 8/4

3:30 pm-4:15 pm

1 stop31h 45m

$910

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 15 results
1
2

Compare providers for flights from Dulles Intl to Sofia

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Dulles Intl to Sofia in April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars
Justfly.comPrice Accuracy3 starsTrust Score*2 stars
CheapfaremartPrice Accuracy-Trust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Sofia flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Washington, D.C. Dulles Intl Airport-Sofia flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Sofia flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Sofia flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C. Dulles Intl Airport-Sofia flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Dulles Intl to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Dulles Intl with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Sofia

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Sofia?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Sofia. Price data was last updated on April 25, 2025.

Booking 44 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. Dulles Intl Airport to Sofia. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Sofia (average of $632). Flying from Washington, D.C. Dulles Intl Airport to Sofia in June is currently the most expensive (average of $1,218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IAD to SOF?

Find hourly flight availability from Dulles Intl to Sofia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 29, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 38% on flights from Washington, D.C. Dulles Intl Airport to Sofia by exploring options for tickets at noon.

Rainfall in Sofia by month

Plan your trip to Sofia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Sofia ranges from 1.2 - 2.8 inches per month. June is typically the wettest month, when rainfall can reach 2.8 in. January is typically the driest time to visit Sofia when rainfall is around 1.2 in.

Temperature in Sofia by month

Plan your trip to Sofia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Sofia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Sofia

Get insights into the airlines that provide service to Sofia. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sofia. Reviews last updated abril 29, 2025.
Read through reviews of airlines operating flights from Washington, D.C. to Sofia, such as KLM, Austrian Airlines and SWISS. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,333 reviews

Crew

8.4

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.2

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
KLM
7.8
Good
1,333 reviews
KLM
7.8
Good
1,333 reviews

Crew

8.4

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.2

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Austrian Airlines
7.6
Good
780 reviews
KLM
7.8
Good
1,333 reviews

Crew

8.4

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.2

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
SWISS
7.5
Good
1,587 reviews
KLM
7.8
Good
1,333 reviews

Crew

8.4

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.2

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
Air France
7.4
Good
1,444 reviews
KLM
7.8
Good
1,333 reviews

Crew

8.4

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.2

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.
United Airlines
7.4
Good
8,696 reviews
KLM
7.8
Good
1,333 reviews

Crew

8.4

Boarding

7.8

Comfort

7.7

Entertainment

7.1

Food

7.2

Overall

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Mar 2025

LBA - AMS

Overall, the flight from Leeds Bradford to Amsterdam was at expected. The crew were efficient at boarding and professional on board. The only issue was extremely slow check in at Leeds Bradford which was very frustrating.

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Sofia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Sofia from Washington, D.C. Dulles Intl?

    Most people fly into Sofia (SOF) if they book a flight to Sofia from Washington, D.C. Dulles Intl. On average, Sofia has 0 inbound flights from Washington, D.C. Dulles Intl per day from 7 airlines. Sofia is conveniently located just 4.2 mi from Sofia’s city center.

  • What are the cheapest airlines flying from Washington, D.C. Dulles Intl Airport to Sofia round-trip?

    Cheapflights users have booked flights from Washington, D.C. Dulles Intl Airport to Sofia round-trip from $755. Other airlines that can offer you cheap pricing are Turkish Airlines, from $764, and British Airways, from $806. These flights start at 12% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Sofia one-way?

    The cheapest airlines for a one-way flight from Washington, D.C. Dulles Intl Airport to Sofia are Air France ($522), United Airlines ($532), and British Airways ($712).

  • Can I find deals for flights from Dulles Intl to Sofia that include hotel bookings?

    Yes. In addition to deals on Dulles Intl to Sofia flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Dulles Intl to Sofia?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Sofia.

  • Can I find deals for business class flights from Dulles Intl to Sofia?

    Yes. Cheapflights offers flight deals from Dulles Intl to Sofia by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, November is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Sofia (average of $632). Flying from Washington, D.C. Dulles Intl Airport to Sofia in June is currently the most expensive (average of $1,218). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Dulles Intl to Sofia

See prices for flight routes from nearby airports that may be better suited for you.
Reagan-National to Sofia flights
Baltimore to Sofia flights

Top 7 airlines flying from Dulles Intl to Sofia

Discover the top 7 airlines that operate flights from Dulles Intl to Sofia. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated abril 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
Turkish AirlinesCheapest$552Average$712FlexibilityNo cancel feeOn-time77%
ITA AirwaysCheapest$597Average$1,101FlexibilityNo cancel feeOn-time81%
British AirwaysCheapest$619Average$1,012FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$709Average$1,135FlexibilityNo cancel feeOn-time69%
Austrian AirlinesCheapest$709Average$1,069FlexibilityNo cancel feeOn-time78%
LufthansaCheapest$762Average$1,063FlexibilityNo cancel feeOn-time76%
SWISSCheapest$792Average$1,108FlexibilityNo cancel feeOn-time79%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.