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$369+ Cheap flights from Washington 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 7/18. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SOF
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheap flight deals from Washington to Sofia

Keep the following information in mind while searching for Washington to Sofia flight deals. Data was last updated June 12, 2025.

Round-trip from

$599
(FlightHub)

One-way from

$369
(Kiwi.com)

Popular in

December

Cheapest in

April

Average price

$1,091
From Washington to Sofia
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One-way flight from Washington to Sofia
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Highest demand for flights based on searches. 4% potential increase in price ($48 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($42 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Find flight deals from Washington to Sofia

Cheapest flights from Washington to Sofia
Explore the most affordable flight options available from Washington to Sofia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/193:10 pmSEA - SOF
1 stop21h 35mLufthansa
Tue 12/26:00 amSOF - SEA
1 stop16h 10mLufthansa
Deal found 6/10$598
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/87:05 pmPDX - SOF
2 stops37h 15mAir Canada
Wed 11/196:15 amSOF - PDX
2 stops37h 19mAir Canada
Deal found 6/10$599
This Air Canada deal was found by Cheapflights users on 6/11. 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.
Sat 11/83:10 pmSEA - SOF
2 stops41h 10mAir Canada
Wed 11/196:15 amSOF - SEA
2 stops37h 01mAir Canada
Deal found 6/11$599
This United Airlines deal was found by Cheapflights users on 6/9. 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.
Wed 11/193:10 pmSEA - SOF
1 stop17h 10mUnited Airlines
Wed 12/32:30 pmSOF - SEA
2 stops20h 01mUnited Airlines
Deal found 6/9$609
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 10/145:15 amGEG - SOF
2 stops26h 35mUnited Airlines
Wed 4/16:15 amSOF - GEG
2 stops24h 54mUnited Airlines
Deal found 6/11$617
This American Airlines deal was found by Cheapflights users on 6/11. 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.
Sat 11/86:50 pmSEA - SOF
1 stop35h 30mAmerican Airlines
Wed 11/193:00 pmSOF - SEA
1 stop35h 55mAmerican Airlines
Deal found 6/11$646
This Justfly.com deal was found by Cheapflights users on 6/11. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/82:00 pmSEA - SOF
1 stop18h 15mMultiple Airlines
Wed 11/196:15 amSOF - SEA
2 stops22h 11mMultiple Airlines
Deal found 6/11$652
This FlightHub deal was found by Cheapflights users on 6/10. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/101:38 pmGEG - SOF
2 stops23h 12mLufthansa
Tue 4/712:45 pmSOF - GEG
2 stops42h 24mLufthansa
Deal found 6/10$657
This United Airlines deal was found by Cheapflights users on 6/10. 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.
Sat 11/87:00 amPDX - SOF
3 stops20h 10mUnited Airlines
Wed 11/196:15 amSOF - PDX
3 stops26h 41mUnited Airlines
Deal found 6/10$663
This Air France deal was found by Cheapflights users on 6/10. 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 France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/811:10 amPDX - SOF
2 stops16h 45mMultiple Airlines
Wed 11/197:00 amSOF - PDX
1 stop14h 25mMultiple Airlines
Deal found 6/10$682
This SWISS deal was found by Cheapflights users on 6/10. 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.
Mon 8/114:25 pmSEA - SOF
1 stop31h 40mSWISS
Wed 9/310:50 amSOF - SEA
2 stops20h 04mSWISS
Deal found 6/10$694
This FlightHub deal was found by Cheapflights users on 6/12. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2210:55 amPDX - SOF
2 stops21h 45mLufthansa
Wed 9/36:15 amSOF - PDX
2 stops22h 14mLufthansa
Deal found 6/12$743

Cheapflights Fare Finder

Customize your flight search to find flights from Washington 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 June 12, 2025.
Use the filters below to find and compare flights from Washington to Sofia that are best for you.

Fly from

Washington

Fly to

Sofia

Route

Depart

Return

Price

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 11/19

3:10 pm-10:45 pm

1 stop21h 35m

Sofia

Tue 12/2

6:00 am-12:10 pm

1 stop16h 10m

$598

PortlandSofia

PDX - SOF

PDXSOF

Portland

Sat 11/8

7:05 pm-6:20 pm

2 stops37h 15m

Sofia

Wed 11/19

6:15 am-9:34 am

2 stops37h 19m

$599

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sat 11/8

3:10 pm-6:20 pm

2 stops41h 10m

Sofia

Wed 11/19

6:15 am-9:16 am

2 stops37h 01m

$599

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Wed 11/19

3:10 pm-6:20 pm

1 stop17h 10m

Sofia

Wed 12/3

2:30 pm-12:31 am

2 stops20h 01m

$609

SpokaneSofia

GEG - SOF

GEGSOF

Spokane

Tue 10/14

5:15 am-5:50 pm

2 stops26h 35m

Sofia

Wed 4/1

6:15 am-9:09 pm

2 stops24h 54m

$617

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sat 11/8

6:50 pm-4:20 pm

1 stop35h 30m

Sofia

Wed 11/19

3:00 pm-4:55 pm

1 stop35h 55m

$646

SeattleSofia

SEA - SOF

SEASOF

Seattle/Tacoma Intl

Sat 11/8

2:00 pm-6:15 pm

1 stop18h 15m

Sofia

Wed 11/19

6:15 am-6:26 pm

2 stops22h 11m

$652

SpokaneSofia

GEG - SOF

GEGSOF

Spokane

Fri 10/10

1:38 pm-10:50 pm

2 stops23h 12m

Sofia

Tue 4/7

12:45 pm-9:09 pm

2 stops42h 24m

$657

PortlandSofia

PDX - SOF

PDXSOF

Portland

Sat 11/8

7:00 am-1:10 pm

3 stops20h 10m

Sofia

Wed 11/19

6:15 am-10:56 pm

3 stops26h 41m

$663

PortlandSofia

PDX - SOF

PDXSOF

Portland

Sat 11/8

11:10 am-1:55 pm

2 stops16h 45m

Sofia

Wed 11/19

7:00 am-11:25 am

1 stop14h 25m

$682

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 21 results
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2
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Best time to book a flight from Washington to Sofia

Have a flexible travel schedule? Discover the best time to fly to Sofia from Washington 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 to Sofia

What is the cheapest month to book a flight from State of Washington to Sofia?

Currently, November is the cheapest month in which you can book a flight from State of Washington to Sofia (average of $632). Flying from State of Washington to Sofia in June is currently the most expensive (average of $1,203). 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 WA to SOF?

Find hourly flight availability from Washington 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 June 12, 2025.

When flying from State of Washington to Sofia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 June 12, 2025.
Read through reviews of airlines operating flights from Washington to Sofia, such as KLM, SWISS and United Airlines. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
SWISS
7.5
Good
1,623 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
United Airlines
7.4
Good
8,790 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Turkish Airlines
7.3
Good
3,848 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
American Airlines
7.2
Good
10,000 reviews
KLM
7.8
Good
1,358 reviews

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Entertainment

7.1

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

Related info for your journey

Find useful and relevant information for your journey from Washington 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?

    Located just 4.2 mi from the city center, Sofia (SOF) is the airport most travelers will use when flying to Sofia from Washington.

  • What are the cheapest airlines to fly from State of Washington to Sofia one-way?

    $522 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Turkish Airlines and Lufthansa, with prices starting from $630 and $1,052, respectively.

  • What are the most popular routes from State of Washington to Sofia?

    When deciding which route to take from State of Washington to Sofia consider Seattle/Tacoma Intl - Sofia, Portland - Sofia or Spokane - Sofia as they are the most popular.

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

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

  • How can I find direct flights from Washington to Sofia?

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

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

    Yes. Cheapflights offers flight deals from Washington 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 State of Washington to Sofia?

    Currently, November is the cheapest month in which you can book a flight from State of Washington to Sofia (average of $632). Flying from State of Washington to Sofia in June is currently the most expensive (average of $1,203). 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.

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Top 4 airlines flying from Washington to Sofia

Discover the top 4 airlines that operate flights from Washington 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$609Average$964FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$678Average$1,054FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$686Average$1,114FlexibilityNo cancel feeOn-time76%
Turkish AirlinesCheapest$700Average$983FlexibilityNo cancel feeOn-time77%

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