PDX - SOF

$647 Find Cheap Flights from Portland to Sofia

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to Sofia departing on 3/12. 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 Portland 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 Portland to Sofia, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Portland to Sofia (PDX-SOF)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland 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 Portland to Sofia

Thu, Mar 12 - Mon, Mar 16
Lufthansa Logo
7:30 pm - 10:45 pmPDX-SOF
18h 15m2 stops
Lufthansa Logo
7:05 pm - 8:49 pmSOF-PDX
34h 44m2 stops
$647Lufthansa
Find Deal
Thu, Mar 12 - Mon, Mar 16
United Airlines Logo
1:25 pm - 10:45 pmPDX-SOF
24h 20m3 stops
United Airlines Logo
2:20 pm - 12:34 amSOF-PDX
19h 14m2 stops
$706United Airlines
Find Deal
Thu, Mar 12 - Mon, Mar 16
KLM Logo
7:00 am - 2:05 pmPDX-SOF
22h 05m2 stops
KLM Logo
7:00 am - 12:25 pmSOF-PDX
14h 25m1 stop
$741KLM
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Tue, Dec 23 - Sun, Jan 4
United Airlines Logo
10:52 pm - 1:50 pmPDX-SOF
28h 58m2 stops
United Airlines Logo
2:25 pm - 9:07 pmSOF-PDX
40h 42m2 stops
$1,626United Airlines
Find Deal
Mon, Dec 22 - Sun, Jan 4
United Airlines Logo
11:55 pm - 1:15 pmPDX-SOF
27h 20m2 stops
United Airlines Logo
2:25 pm - 7:01 pmSOF-PDX
38h 36m2 stops
$1,651United Airlines
Find Deal
Tue, Dec 23 - Sun, Jan 4
United Airlines Logo
7:00 am - 11:50 amPDX-SOF
42h 50m3 stops
United Airlines Logo
2:25 pm - 10:40 pmSOF-PDX
42h 15m2 stops
$1,657United Airlines
Find Deal
Sat, Dec 20 - Sun, Jan 4
United Airlines Logo
10:52 pm - 6:00 pmPDX-SOF
33h 08m2 stops
United Airlines Logo
2:25 pm - 9:07 pmSOF-PDX
40h 42m2 stops
$1,822United Airlines
Find Deal
Mon, Dec 22 - Sun, Jan 4
United Airlines Logo
7:00 am - 11:50 amPDX-SOF
42h 50m3 stops
United Airlines Logo
2:25 pm - 7:01 pmSOF-PDX
38h 36m2 stops
$1,837United Airlines
Find Deal
Tue, Dec 23 - Sun, Jan 4
Multiple Airlines Logo
11:53 am - 1:15 pmPDX-SOF
39h 22m3 stops
Multiple Airlines Logo
6:10 am - 9:59 pmSOF-PDX
49h 49m3 stops
$2,478Multiple Airlines
Find Deal
Mon, Dec 22 - Sun, Jan 4
KLM Logo
1:25 pm - 2:05 pmPDX-SOF
14h 40m1 stop
KLM Logo
7:00 am - 11:25 amSOF-PDX
14h 25m1 stop
$3,229KLM
Find Deal

Everything you should know

Top airlines
Lufthansa
Cheapest • from $647 (round-trip)
KLM
Best reviews • 7.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to travel
November
Cheapest • 32% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest round-trip
$647
Overall average: $874
Lufthansa
Thu 3/12Mon 3/16
PDX - SOF • 2 stops
Cheapest one-way
Multiple Airlines
Mon 11/3
PDX - SOF • multi-stop
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Sofia!
Booking Insights

KAYAK's insights & trends for Portland to Sofia flights

Get data-powered insights and trends into flights from Portland to Sofia to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Portland to Sofia?

The average price of all round-trip flights from Portland to Sofia clicked on KAYAK for each day over the last 12 months.

If you are looking for a flight deal from Portland to Sofia, look for departures on Tuesdays and avoid leaving on a Saturday, as it's usually the priciest day. When flying back from Sofia, Friday is the cheapest day to fly and Tuesday is the most expensive.

What is the cheapest month to fly from Portland to Sofia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Portland 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 Portland to Sofia is November, where tickets cost $682 (return) on average. On the other hand, the most expensive months are May and June, where the average cost of round-trip tickets is $1,424 and $1,383 respectively.

Good to know

Low seasonNovember
Cheapest flight$647
Best time to beat the crowds with an average 32% drop in price.
Most popular time to fly and prices are also 22% lower on average.
Flight from Portland to Sofia

When to book flights from Portland to Sofia

Are your dates flexible? Find out the best times to travel from Portland 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 flights from Portland to Sofia

  • What is the cheapest flight from Portland to Sofia?

    In the last 3 days, the lowest price for a flight from Portland to Sofia was $647 for a round-trip ticket.

  • Do I need a passport to fly between Portland and Sofia?

    Yes

  • Which airports will I be using when flying from Portland to Sofia?

    Portland and Sofia are both served by 1 main airport. You will leave Portland from Portland and will be arriving at Sofia.

  • Which aircraft models fly most regularly from Portland to Sofia?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Portland to Sofia?

    Star Alliance, and SkyTeam are the airline alliances operating flights between Portland and Sofia, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Portland to Sofia, KLM or United Airlines?

    The two airlines most popular with KAYAK users for flights from Portland to Sofia are KLM and United Airlines. With an average price for the route of $929 and an overall rating of 7.7, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $924 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Portland 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 Portland to Sofia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Portland to Sofia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Portland 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 Portland 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 Portland with another airline. Booking your flights between Portland 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 Portland 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 Portland 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 Portland to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Portland 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 Portland 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.
7.7
KLMOverall score based on 1404 reviews
7.1Entertainment
7.3Food
7.8Boarding
8.4Crew
7.7Comfort
Airline reviews

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

2.0 MediocreElizabeth, Oct 2025CDG - AMS
Read more KLM reviews

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Klm start boarding while somw air issue in the plan

The service was great. However the lounge only gets passing grade

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Short flight but an "eager to help" crew made the journey more enjoyable!

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

The person I bought the ticket for didn’t make the flight.

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

Excellent flight. Smooth, efficient boarding. Quick flight. Arrived early at STL.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Same as last comment. Food sucks. Quality. Not surprising most people have no clue about nourishment Clearly

Not the fault of United—weather, reroute around weather, time sitting on tarmac, arrived couple hours late, too late for train into city necessitating a much pricier cab but weather…can’t be helped.

Great check in process in LA and good service The check in process as well as at the gate is way better in the US versus canada 🇨🇦

Super experience. Earlier than schedule departure and arrival. Baggage handling was very good

Allow me to book extra bag check in as free though I packed in 1 luggage but that was 7 LBS overweight so make another bag to free check in.

I would like to get my money back. I flight was 4 hours late on the way to detroit, And same on my way back to Brussels they cancelled my flight and give me an other ticket and i had to wait 5 hours.

All attendents were very efficient, pleasant and happy. Everything went smoothly. The seats could have been wider. There could have been more free food instead of just one small bar.

My seat was one of those that couldn't recline, but the problem was that it was abnormally upright, so the headrest actually made the seat concave, which was uncomfortable and hard on my lower back. I had to ball my jacket up and use it as lumbar support. goodness I had it with me.

Boarding was so so after zone 3 was called all other zones went in

I liked a lot , the flight attendant so nice ,the seat very comfortable I enjoyed the flight , I will do it again with Air Canada,

Plane left an hour late, I missed my connection and my bow case was never even loaded on the plane in VA. I deal with this type of nonsense everytime I fly air canada.

For goodness sake, board from the back of the plane to the front and assign overhead space. It would fix everything. Seriously.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

We didn't get the coffee with breakfast in the morning.. 30 mins lazer I asked flight attendant why don't we get coffee now at least.. after the breakfast..she said that captain announced possible turbulences fee minutes ago, which didn't ecplain why we didn't get it with the breakfast..breakfast was very poor btw..just little pastry which you can eat in 4 little bites. Turbulences fortunately didn't even happen.. but we didn't get that more than necessary coffee in the morning after the night flight with very poor sleep.. They just served breakfast 1 hour afzer we took off..at like 11 PM.. that doesn't make sense at all.. Also, flight attendants weren't very nice..they looked like they're not happy with their job.. :/

Lufthansa still has a good level of quality compared to US airlines, especially with respect to (1) food quality - actually tasty, (2) good French red wine - free, (3) good movie selection. Also my ticket price includes 1 free check-in luggage, while some other budget airlines sneak in an extra $150 for a checkin.

I think they overbooked Frankfurt to New York and bumped me off. This changed my return travel I arrived home about 4 hours late. Almost 24 total travel time Totally unacceptable Would not travel with United

We were moved twice on flights to the point we weren’t even on Lufthansa anymore. We had to fly united. Lost paid extra leg room twice. To top it all off we’re forced to pay $375 and $275, respectively for you luggage that was considered sports luggage. We were told it would be Lufthansa fares l, from the united desk, AND WE DIDN'T EVEN HAVE A LUFTHANSA FLIGHT! I’ll be calling once my trip is over on October 7th to all airlines and Kayak. This was ridiculous!

Everything went smoothly and the staff was very kind. I’m glad I purchased the extra leg room for my long flight; it was totally worth it. We were served 2 meals for a 9 hour flight which I was not expecting and they were very tasty. I appreciated them being vegetarian. Customs line in Munich was long; I had a choice to have a 1 hr 40 min layover or 2 hr 40 min layover; I took the longer layover which I was thankful for because my flight was delayed 30 minutes and there’s a good chance I would have missed my connecting flight. This was my very first international flight and I would fly Discover again without hesitation. Thank you for taking good care of me!

Everything you need to know for your flight from Portland to Sofia

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