CHI - SOF

$373 Find Cheap Flights from Chicago to Sofia

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Chicago to Sofia departing on 9/11. 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

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These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to Sofia.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Chicago to Sofia.
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Flight Deals

Cheap Flights from Chicago to Sofia (CHI-SOF)

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

Sun, Oct 26 - Sun, Nov 9
Lufthansa Logo
10:50 pm - 6:20 pmORD-SOF
12h 30m1 stop
Lufthansa Logo
2:25 pm - 8:05 pmSOF-ORD
13h 40m1 stop
$549Lufthansa
Find Deal
Sun, Nov 9 - Thu, Dec 4
Air Canada Logo
7:15 am - 6:20 pmORD-SOF
27h 05m2 stops
Air Canada Logo
6:00 am - 8:00 pmSOF-ORD
22h 00m2 stops
$551Air Canada
Find Deal
Mon, Nov 24 - Wed, Mar 11
 Logo
6:50 pm - 6:20 pmORD-SOF
15h 30m2 stops
 Logo
2:25 pm - 9:13 amSOF-ORD
25h 48m2 stops
Sun, Sep 14 - Thu, Feb 19
United Airlines Logo
10:30 pm - 10:50 pmORD-SOF
16h 20m1 stop
United Airlines Logo
6:00 am - 8:00 pmSOF-ORD
22h 00m2 stops
$555United Airlines
Find Deal
Sun, Sep 14 - Mon, Feb 16
SWISS Logo
7:05 pm - 12:30 pmORD-SOF
33h 25m1 stop
SWISS Logo
3:00 pm - 4:20 pmSOF-ORD
33h 20m1 stop
$556SWISS
Find Deal
Mon, Oct 13 - Wed, Nov 5
United Airlines Logo
9:40 pm - 11:00 pmORD-SOF
17h 20m1 stop
United Airlines Logo
2:25 pm - 1:01 pmSOF-ORD
30h 36m2 stops
$557United Airlines
Find Deal
Wed, Sep 17 - Wed, Oct 15
Turkish Airlines Logo
11:45 pm - 8:35 amORD-SOF
24h 50m1 stop
Turkish Airlines Logo
9:15 pm - 9:40 amSOF-ORD
20h 25m1 stop
$561Turkish Airlines
Find Deal
Mon, Oct 6 - Tue, Oct 21
Turkish Airlines Logo
11:45 pm - 2:45 pmORD-SOF
31h 00m1 stop
Turkish Airlines Logo
3:35 pm - 9:40 amSOF-ORD
26h 05m1 stop
$563Turkish Airlines
Find Deal
Mon, Dec 8 - Tue, Jan 13
KLM Logo
1:50 pm - 2:05 pmMDW-SOF
16h 15m2 stops
KLM Logo
7:00 am - 6:08 pmSOF-MDW
19h 08m2 stops
$669KLM
Find Deal
Thu, Oct 16 - Mon, Oct 20
KLM Logo
9:35 am - 2:00 pmMDW-SOF
44h 25m2 stops
KLM Logo
7:00 am - 6:25 pmSOF-MDW
19h 25m2 stops
$881KLM
Find Deal
Booking Insights

KAYAK's insights & trends for Chicago to Sofia flights

Get data-powered insights and trends into flights from Chicago 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 Chicago to Sofia?

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

If you are looking for a flight deal from Chicago to Sofia, look for departures on Thursdays and avoid leaving on a Monday, as it's usually the priciest day. When flying back from Sofia, Wednesday is the cheapest day to fly and Monday is the most expensive.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Chicago 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 Chicago to Sofia is February, where tickets cost $564 (return) on average. On the other hand, the most expensive months are June and May, where the average cost of round-trip tickets is $1,143 and $977 respectively.

How far in advance should I book a flight from Chicago to Sofia?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Chicago to Sofia, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Chicago to Sofia, you should book around 1 week before departure. For the absolute cheapest price, our data suggests you should book 3 weeks before departure.

Good to know

Low seasonApril
Cheapest flight$373
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly with an average 19% increase in price.
Flight from Chicago O'Hare Airport to Sofia

When to book flights from Chicago to Sofia

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

  • Does SOF have an on-site hotel?

    If you intend to stay at a hotel within SOF grounds, you're in luck, as the airport boasts the Ibis Sofia Airport. A 10min walk from Terminal A, this hotel boasts elite rooms. Thus, it's safe to say that your comfort is guaranteed at this hotel.

  • How can I move from Terminal 1 to 2 at SOF?

    In case you'd like to move from Terminal 1 to 2, or vice versa, you can board the free shuttle bus that connects these terminals. Daily, this bus operates from 5 am to 11 pm. It covers the route every 15min.

  • Are there nursing rooms at ORD?

    If you'd like to breastfeed your infant while waiting for your flight to Sofia at ORD, you need not worry about struggling to find a private space to feed your baby, as ORD features several nursing rooms. The said nursing rooms are near Gate B10 in Terminal 1, on the walkway between Gates E5 and F9 in Terminal 2, near the Urban Garden in Terminal 3's rotunda, and a short distance from Gate M14 in Terminal 5.

  • Where can I get assistance at MDW?

    If you need assistance at MDW, you should visit the airport's information desk, situated at the Main Entrance of the airport's terminal. At this desk, you'll get all the help you need, as it is manned by informed airport staff.

  • What is the cheapest flight from Chicago to Sofia?

    In the last 3 days, the lowest price for a flight from Chicago to Sofia was $373 for a one-way ticket and $549 for a round-trip.

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

    Yes, you’ll need a passport to travel to Sofia from Chicago.

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

    When flying out of Chicago you will be using one of these airports: Chicago Midway or Chicago O'Hare Intl. You will be landing at Sofia.

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

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

  • Which airline alliances offer flights from Chicago to Sofia?

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

  • What is the most popular layover when flying to Sofia from Chicago?

    Istanbul is the most popular layover city among KAYAK users traveling from Chicago to Sofia.

  • Which is the best airline for flights from Chicago to Sofia, KLM or LOT?

    The two airlines most popular with KAYAK users for flights from Chicago to Sofia are KLM and LOT. With an average price for the route of $789 and an overall rating of 7.8, KLM is the most popular choice. LOT is also a great choice for the route, with an average price of $980 and an overall rating of 7.6.

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

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Sofia from Chicago 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 Chicago 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 Chicago with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Chicago 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 Chicago up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Chicago to Sofia

  • In Chicago, you can board your flight to Sofia at Chicago Midway International Airport (MDW) or O'Hare International Airport (ORD). If you'd like to fly cheaply to Sofia, ORD is the airport for you, as it serves the cheapest flights from Chicago to the Bulgarian capital. On the other, if you'd like to board your flight at an airport where you'll encounter the least traffic, MDW is the airport for you.
  • On the day you're set to fly to Sofia from ORD or MDW, you should get to your Chicago airport of choice at least 2h ahead of your flight. This will give you adequate time to go through the airport's security checkpoints in time for your flight. It will also give you enough time to check out the airport's points of interest.
  • All airlines traveling from ORD and MDW to Sofia Airport (SOF) offer elite-assisted travel services to passengers with disabilities, provided that the said passengers contact them at least 72h before their flight. Therefore, if you have special needs and require special in-flight services, you should contact the airline you plan on traveling with from your preferred Chicago airport to Sofia at least 72 before your flight.
  • To be able to purchase items and pay for services easily while in Sofia, you should convert some of your cash to Bulgaria's local currency at one of SOF's currency exchange sites run by ICE Exchange. Two are located in 2, while one is found in Terminal 1.
  • SOF features locations for car rentals like Avis, Budget, SIXT, Thrifty, Europcar, and Enterprise in Terminal 2. This being the case, if you'd like to hire a car once you land at SOF, you'll have a variety of car rental agencies to choose from.

Reviews of the top 5 airlines serving from Chicago to Sofia

 
See real verified KAYAK customer reviews for airlines flying from Chicago 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 Chicago 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.
7.8
KLMOverall score based on 1382 reviews
7.3Food
7.8Boarding
8.4Crew
7.1Entertainment
7.7Comfort
Airline reviews

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.

2.0 MediocrePeter, Aug 2025SAN - AMS
Read more KLM reviews

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.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

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!

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!

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

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

During the flight, the fleas biting me in the plane.

Boarding could've been improved a bit, the rest is excellent.

Agents helping disable person doesnt know connections to Poland and after 9 agents helping and 2hours ,we made it to proper terminal. Polish Dreamliner its Polish nightmare liner with so narrow seats and no room under front seat for bag and feet,in economy class.To upgrade, to higher standart cost an arm and leg ,even there are empty seats No good experience overall

The crew and flight were amazing . However , my bag’s locker got broken and no refund provided . Everything else was amazing except this bad incident that ruined my experience

The seats are small and the movie selection was disappointing. However, the food was excellent and the cabin crew was attentive and kind.

Bags lost no more to say, bad communication and no urgency to get it back to the hotel by the airline properly the worst airline I have used.

The customer service rep on chat refused carrying golf set at no charge that is customary for LOT and others. I wanted yo carry just ONE club not even full set! Web check in was nightmare. Most horrible lounge at warsaw. To call it business class is a BIG exaggeration. Rude staff warsaw to nyc. Seats uncomfortable and not flat as is now customary. Bad content and entertainment system.

It was was okay but the seat was stiff and hard to sit on it!!

The 737 lacked business-class seating. It was basically economy plus but with the middle seats left unsold. There were no TV screens but good food and service.

Plane is super outdated, seats not that comfortable for business class. Lounge also out dated. They need to catch up to 2024. Don’t think I’d ever fly again.

Once we got in the air the pilot made up some of the time of the delay. So that was really nice.

We had a layover from YVR to Denver. We bought 4 bottles of Absolut Vodka at the YVR Duty Free for $116.20, after going through security and American Customs Pre Clearance at YVR, Vancouver. When we landed in Denver, United put us behind the American Customs as well as TSA again for some reason. We were forced to go through American Customs and TSA again. TSA confiscated our rightfully owned Duty Free Absolut Vodka bottles. Because United incorrectly forced our flight behind American border and TSA again, we missed the connecting flight. After United put us on a later flight, we eventually arrived in Chicago very late, with hardly any sleep. I am looking for compensation from United for our incorrectly confiscated Absolut Vodka bottles worth $116.20, as well as compensation for incorrectly putting us behind American Customs and TSA again, causing us to miss our connecting flight, making us arrive extremely late in Chicago.

Excellent flight. Boarding was efficient and departure was on time. Smooth flight with on time arrival. Deplaning was also efficient.

Ridiculous boarding. Enter the gate, walk down a staircase with bags, exit a building, get on a crowded bus, dropped off a few meters away from the aircraft, walk with bags to another set of stairs to board the aircraft. And all that during a pouring down rain, and with children. Ridiculous!!!

It was delayed instead of departing at 9:20pm, we departed at 11pm… putting us in Columbus after 2am! It was awful. Had I known about the delay, I could have spent some time in the United Lounge… I was starving because I started my journey in Budapest… so I was exhausted and hungry. Plus I had to make new arrangements to be picked up at the airport in Columbus, instead of midnight it was 2:30 am after getting luggage and out of airport. Not feasible. I would have just stayed in Chicago for the night and gotten a morning flight.

It was great, I’m very grateful for the pilots and crew flight attendants for everything.

Evidently, my seat had the only broken TV. I couldn’t plug it in, get it to come on, or watch anything, and of course, no one could fix it while we were on the plane. The service was good and the boarding was quick

The boarding of took of late.The presentation of the food was horrable as was the tast of the food was cold and tastless.

Delay and keep changing gates. I have to run around from B to C then to E.

I was charged for my daughters bag when I am supposed to receive two free checked bags with my United Explorer card.

my experience was great with Turkish airlines . the problem i encountered was with kayak booking. When I booked . it showed that im allowed a bag . and when I got to the airport, i had to pay $165 for one bag.

Not up to Business Class standards. Two of the three toilets were out of order. The hostesses were aware and didn’t show any responsible act to do something. Food quality was not what we expect from Turkish hospitality. Overall we were not impressed and disappointed.

During mid flight, try to get a flight attendant to help I couldn’t find one Otherwise, everything was perfect

I was not given basinett seat.The connecting flight was missed due to airline fault i was not accomodated for hotel.Drinks were normt served frewuently.Never travelling again on tirkish airlines.I always travel wiyh family by turkish airline but no more.zero stars

The crew were very hospitable and pleasant. The food was pretty good. Unfortunately, there was a flight delay of more than 2 hours. We're not sure why but it appeared to be outside the control of Turkish Airlines.

Bough tickets with luggage, but made me pay at Airport as well

The economy seat was so uncomfortable, had not enough leg room for 13 hours flight, front seat basket was broken and couldn’t hold anything, food quality was horrible( we got food poisoned ) we charged for logged which used to be free. We paid too much for this flight and very disappointed. Turkish air line better to make satisfy and respect people instead of find different way to scam people.

This is really the rating of two flights. JFK to IST then IST to NQZ. New York to Istanbul was good. Good crew and all positives. The flight to Astana was so bad that brought it all down. Crew was nonexistent above the minimum, seats were cramped, and it was hot on the plane. Turkish Airlines seems to be slipping down to US based carriers level.

The 2 agents on the check in counter were super nice , helpful and very polite. Boarding was like a 1 2 3, I would recommend Turkish airlines for your next trip.

Everything was very good, except that the plane was an hour and a half late

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

Flight was late arriving. So, we left 25 min late. Pilot made some time up during the flight. Therefore, we arrived alittle past original time.

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