$440 Cheap Flights from Portland (PDX) to Sofia (SOF)

View $440 flight on Thu, Dec 4, 2025Opens in a new window

Popular airlines from Portland International Airport (PDX) to Sofia Airport (SOF)

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Cheap Flights from Portland to Sofia (PDX-SOF)

Prices were available within the past 7 days and start at $440 for one-way flights and $529 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Fri, Jan 23 - Fri, Jan 30
PDX
Portland
SOF
Sofia
$529 Roundtrip, found 9 hours ago
$529
Roundtrip
found 9 hours ago
Select Air Canada flight, departing Fri, Jan 23 from Portland to Sofia, returning Fri, Jan 30, priced at $529 found 9 hours ago
Air Canada
Fri, Jan 23 - Sat, Jan 31
PDX
Portland
SOF
Sofia
$532 Roundtrip, just found
$532
Roundtrip
just found
Select Air Canada flight, departing Fri, Jan 23 from Portland to Sofia, returning Sat, Jan 31, priced at $532 just found
Lufthansa
Fri, Feb 6 - Fri, Feb 13
PDX
Portland
SOF
Sofia
$532 Roundtrip, found 3 days ago
$532
Roundtrip
found 3 days ago
Select Lufthansa flight, departing Fri, Feb 6 from Portland to Sofia, returning Fri, Feb 13, priced at $532 found 3 days ago
United
Thu, Jan 22 - Wed, Jan 28
PDX
Portland
SOF
Sofia
$534 Roundtrip, just found
$534
Roundtrip
just found
Select United flight, departing Thu, Jan 22 from Portland to Sofia, returning Wed, Jan 28, priced at $534 just found
United
Tue, Feb 3 - Thu, Feb 12
PDX
Portland
SOF
Sofia
$534 Roundtrip, found 5 days ago
$534
Roundtrip
found 5 days ago
Select United flight, departing Tue, Feb 3 from Portland to Sofia, returning Thu, Feb 12, priced at $534 found 5 days ago
Lufthansa
Fri, Jan 23 - Fri, Jan 30
PDX
Portland
SOF
Sofia
$536 Roundtrip, found 9 hours ago
$536
Roundtrip
found 9 hours ago
Select Lufthansa flight, departing Fri, Jan 23 from Portland to Sofia, returning Fri, Jan 30, priced at $536 found 9 hours ago
Air Canada
Sun, Dec 7 - Tue, Dec 16
PDX
Portland
SOF
Sofia
$538 Roundtrip, found 5 days ago
$538
Roundtrip
found 5 days ago
Select Air Canada flight, departing Sun, Dec 7 from Portland to Sofia, returning Tue, Dec 16, priced at $538 found 5 days ago
Air Canada
Fri, Jan 23 - Fri, Jan 30
PDX
Portland
SOF
Sofia
$540 Roundtrip, found 9 hours ago
$540
Roundtrip
found 9 hours ago
Select Air Canada flight, departing Fri, Jan 23 from Portland to Sofia, returning Fri, Jan 30, priced at $540 found 9 hours ago
British Airways
Thu, Jan 22 - Wed, Jan 28
PDX
Portland
SOF
Sofia
$547 Roundtrip, just found
$547
Roundtrip
just found
Select British Airways flight, departing Thu, Jan 22 from Portland to Sofia, returning Wed, Jan 28, priced at $547 just found
KLM
Fri, Jan 16 - Wed, Feb 11
PDX
Portland
SOF
Sofia
$586 Roundtrip, found 5 days ago
$586
Roundtrip
found 5 days ago
Select KLM flight, departing Fri, Jan 16 from Portland to Sofia, returning Wed, Feb 11, priced at $586 found 5 days ago

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 $629
SOF
Sofia Airport
CheapestClosest
Average driving time to city center11 min
Flights from $629
Flights from Portland (PDX) to Sofia (SOF)
Origin airport
Portland Intl.
Destination airport
Sofia
Airlines serving
Air Canada, Air France, British Airways, KLM, Lufthansa, Swiss International Air Lines, United
Roundtrip price
$529
Distance
5988 mi

Portland to Sofia Flights

The cheapest times to fly from Portland 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 Portland to Sofia are during the month of January. You can find some of the cheapest flights from Portland to Sofia with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Portland to Sofia

Sunday is one of the best days to book for cheap flights from Portland 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 Portland 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 Portland to Sofia in 2025. You can also book with separate airlines for your outbound and return journeys, from $440 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 Portland 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 Portland 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 Portland Intl. Airport (PDX) to Sofia Airport (SOF) cost?
Grab a cheap one-way flight from $440 or cheap return flight from $529 from Portland Intl. Airport (PDX) to Sofia Airport (SOF) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Portland Intl. Airport (PDX) to Sofia Airport (SOF)?
Planning your trip for January is a good way to save, as it's the cheapest month for flights between PDX and SOF. You'll often find the lowest fares during the off-season.
What is the cheapest airline that flies from Portland Intl. Airport (PDX) to Sofia Airport (SOF)?
Use the filter tool on Expedia to compare airlines and find the most affordable carrier that'll take you from PDX to SOF. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Portland Intl. Airport (PDX) to Sofia Airport (SOF)?
You'll have to catch a flight with a layover if you're traveling from Portland Intl. Airport (PDX) to Sofia Airport (SOF). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from PDX to SOF?
Usually you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* However, this can change based on the season, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Portland Intl. Airport (PDX) to Sofia Airport (SOF)?
To arrive at Sofia Airport (SOF) on schedule, book a flight that leaves from Portland Intl. Airport (PDX) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Portland Intl. Airport (PDX) to Sofia Airport (SOF) last-minute?
Booking your plane ticket from PDX to SOF just before your trip is usually more expensive. However, if there's some wiggle room with your travel dates and times, you could land a cheap last-minute fare.
Is it cheaper to book a PDX to SOF flight and hotel package?
You'll typically save money by securing a PDX 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 simple to manage everything in one place. Once you've selected your preferred flights and accommodations, consider other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Portland Intl. Airport (PDX) to Sofia Airport (SOF)?
You can usually cancel or reschedule your PDX to SOF flight. However, if the booking was made more than 24 hours ago, 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 information on our Customer Service portal.

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*Available to One Key members.