$450 Cheap Flights from Washington (IAD) to Sofia (SOF)

View $450 flight on Mon, Jan 5, 2026Opens in a new window

Popular airlines from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF)

Cheap Flights from Washington to Sofia (IAD-SOF)

Prices were available within the past 7 days and start at $450 for one-way flights and $527 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Mon, Dec 1 - Thu, Dec 11
IAD
Washington
SOF
Sofia
$527 Roundtrip, found 6 days ago
$527
Roundtrip
found 6 days ago
Select United flight, departing Mon, Dec 1 from Washington to Sofia, returning Thu, Dec 11, priced at $527 found 6 days ago
Lufthansa
Sun, Nov 30 - Sun, Dec 14
IAD
Washington
SOF
Sofia
$531 Roundtrip, found 4 days ago
$531
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Sun, Nov 30 from Washington to Sofia, returning Sun, Dec 14, priced at $531 found 4 days ago
Air Canada
Wed, Jan 28 - Wed, Feb 11
IAD
Washington
SOF
Sofia
$537 Roundtrip, found 4 days ago
$537
Roundtrip
found 4 days ago
Select Air Canada flight, departing Wed, Jan 28 from Washington to Sofia, returning Wed, Feb 11, priced at $537 found 4 days ago
United
Thu, Jan 22 - Sun, Jan 25
IAD
Washington
SOF
Sofia
$541 Roundtrip, found 6 days ago
$541
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jan 22 from Washington to Sofia, returning Sun, Jan 25, priced at $541 found 6 days ago
United
Sat, Jan 17 - Sat, Jan 24
IAD
Washington
SOF
Sofia
$543 Roundtrip, found 6 days ago
$543
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jan 17 from Washington to Sofia, returning Sat, Jan 24, priced at $543 found 6 days ago
Lufthansa
Sun, Nov 30 - Sun, Dec 14
IAD
Washington
SOF
Sofia
$545 Roundtrip, found 4 days ago
$545
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Sun, Nov 30 from Washington to Sofia, returning Sun, Dec 14, priced at $545 found 4 days ago
Lufthansa
Fri, Nov 28 - Thu, Dec 4
IAD
Washington
SOF
Sofia
$552 Roundtrip, found 6 days ago
$552
Roundtrip
found 6 days ago
Select Lufthansa flight, departing Fri, Nov 28 from Washington to Sofia, returning Thu, Dec 4, priced at $552 found 6 days ago
United
Sun, Feb 22 - Thu, Mar 12
IAD
Washington
SOF
Sofia
$554 Roundtrip, found 4 days ago
$554
Roundtrip
found 4 days ago
Select United flight, departing Sun, Feb 22 from Washington to Sofia, returning Thu, Mar 12, priced at $554 found 4 days ago
Austrian Airlines
Sun, Nov 30 - Sun, Dec 14
IAD
Washington
SOF
Sofia
$567 Roundtrip, found 4 days ago
$567
Roundtrip
found 4 days ago
Select Austrian Airlines flight, departing Sun, Nov 30 from Washington to Sofia, returning Sun, Dec 14, priced at $567 found 4 days ago
British Airways
Tue, Apr 21 - Mon, Apr 27
IAD
Washington
SOF
Sofia
$583 Roundtrip, just found
$583
Roundtrip
just found
Select British Airways flight, departing Tue, Apr 21 from Washington to Sofia, returning Mon, Apr 27, priced at $583 just found

Find the cheapest month to fly from Washington (IAD) to Sofia (SOF)

November is typically the cheapest month to fly

From $551 - $1,024 per traveler.

Alternative airports near Sofia

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Sofia Airport SOF. Cheapest and Closest option available. Average driving time to city center is 11 minutes. Flights from $603
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $603
Flights from Washington (IAD) to Sofia (SOF)
Origin airport
Washington Dulles Intl.
Destination airport
Sofia
Airlines serving
Air Canada, Air France, Austrian Airlines, British Airways, Emirates, ITA Airways, Iberia, KLM, Lufthansa, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United
Roundtrip price
$527
Distance
4934 mi

Washington to Sofia Flights

The cheapest times to fly from Washington to Sofia

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Washington to Sofia are during the month of December. You can find some of the cheapest flights from Washington to Sofia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Washington to Sofia

Sunday is one of the best days to book for cheap flights from Washington to Sofia: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Washington to Sofia

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Washington to Sofia in 2025. You can also book with separate airlines for your outbound and return journeys, from $450 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Washington to Sofia flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Washington to Sofia airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF) cost?
Secure a cheap one-way flight from $450 or cheap return flight from $527 from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF)?
December is the least expensive month to fly from IAD to SOF. Planning your trip for the off-season is often the key to finding better fares.
What is the cheapest airline that flies from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF)?
Use the filters on Expedia to compare different airlines and find the cheapest carrier that'll take you from IAD to SOF. Then, sort your results by "Price (lowest to highest)" to snap up the best deal available.
How many flights per day from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF)?
Direct flights from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from IAD to SOF?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF)?
To touch down at Sofia Airport (SOF) on schedule, select a flight that leaves from Washington Dulles Intl. Airport (IAD) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF) last-minute?
Holding off until just before your trip to book your flight from IAD to SOF generally means paying more. While it's possible to find some last-minute discounts, there's no guarantee. Be flexible with your itinerary for a better chance of getting a bargain.
Is it cheaper to book an IAD to SOF flight and hotel package?
You can save money by booking an IAD to SOF flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one convenient place. After selecting your ideal accommodations and flights, you can add extras like activities, tours and car rentals.
Can I cancel or change the date of my flight from Washington Dulles Intl. Airport (IAD) to Sofia Airport (SOF)?
It's generally possible to cancel or reschedule your IAD to SOF flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more details on our Customer Service portal.

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*Available to One Key members.