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Cheap flights from Illinois to Bulgaria from $243

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Bulgaria departing on 3/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to Bulgaria

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
3:50 pm - 10:45 pm
STL
-
SOF
22h 55m1 stop
United Airlines Logo
6:00 am - 3:15 pm
SOF
-
STL
41h 15m2 stops
$550United Airlines
Fri, Jan 30 - Tue, Feb 3
Turkish Airlines Logo
11:25 am - 8:45 am
ORD
-
VAR
13h 20m1 stop
Turkish Airlines Logo
9:35 am - 9:40 am
VAR
-
ORD
32h 05m1 stop
$552Turkish Airlines
Mon, Mar 30 - Fri, Apr 10
United Airlines Logo
3:50 pm - 10:45 pm
STL
-
SOF
22h 55m1 stop
United Airlines Logo
6:00 am - 7:27 pm
SOF
-
STL
21h 27m2 stops
$553United Airlines
Fri, Jan 30 - Tue, Feb 3
Lufthansa Logo
9:50 pm - 6:20 pm
ORD
-
SOF
12h 30m1 stop
Lufthansa Logo
6:10 am - 1:25 pm
SOF
-
ORD
15h 15m1 stop
$568Lufthansa
Sun, Jan 25 - Sun, Feb 8
Lufthansa Logo
9:50 pm - 10:45 pm
ORD
-
SOF
16h 55m1 stop
Lufthansa Logo
6:05 am - 2:10 pm
SOF
-
ORD
16h 05m1 stop
$569Lufthansa
Thu, Jan 15 - Thu, Jan 29
LOT Logo
9:55 pm - 5:50 pm
ORD
-
SOF
11h 55m1 stop
LOT Logo
2:35 pm - 8:00 pm
SOF
-
ORD
13h 25m1 stop
$570LOT
Sat, Jan 31 - Sun, Feb 8
Multiple Airlines Logo
2:00 pm - 11:50 am
ORD
-
SOF
13h 50m2 stops
Multiple Airlines Logo
6:25 am - 3:20 pm
SOF
-
ORD
16h 55m1 stop
$572Multiple Airlines
Sat, Feb 14 - Sat, Feb 28
Multiple Airlines Logo
6:00 pm - 1:15 pm
ORD
-
SOF
11h 15m1 stop
Multiple Airlines Logo
7:55 am - 6:41 pm
SOF
-
ORD
18h 46m2 stops
$573Multiple Airlines
Mon, Feb 16 - Mon, Mar 2
KLM Logo
1:09 pm - 2:00 pm
MDW
-
SOF
16h 51m2 stops
KLM Logo
7:00 am - 4:36 pm
SOF
-
MDW
17h 36m2 stops
$628KLM
Tue, Mar 31 - Fri, Apr 17
KLM Logo
1:09 pm - 2:00 pm
MDW
-
SOF
16h 51m2 stops
KLM Logo
7:00 am - 4:36 pm
SOF
-
MDW
17h 36m2 stops
$629KLM
Mon, Mar 30 - Mon, Apr 13

SWISS flights from Illinois to Bulgaria

Our best SWISS deals on Illinois to Bulgaria flight tickets
SWISS
Apr 3
ORD3:50 pmChicago O'Hare Intl
13h 05m
1 stop
SOF12:55 pmSofia
Apr 21
SOF1:05 pmSofia
31h 40m
1 stop
ORD12:45 pmChicago O'Hare Intl
$614
Find similar
SWISS
Mar 29
ORD6:40 pmChicago O'Hare Intl
33h 35m
2 stops
SOF12:15 pmSofia
Apr 18
SOF1:45 pmSofia
34h 10m
1 stop
ORD3:55 pmChicago O'Hare Intl
$622
Find similar

Air Canada flights from Illinois to Bulgaria

Our best Air Canada deals on Illinois to Bulgaria flight tickets
Air Canada
Apr 1
ORD8:40 amChicago O'Hare Intl
26h 00m
2 stops
SOF6:40 pmSofia
Apr 19
SOF12:55 pmSofia
38h 55m
2 stops
ORD7:50 pmChicago O'Hare Intl
$619
Find similar
Air Canada
Mar 11
ORD12:50 pmChicago O'Hare Intl
22h 30m
2 stops
SOF6:20 pmSofia
Apr 11
SOF6:20 amSofia
23h 43m
2 stops
ORD10:03 pmChicago O'Hare Intl
$621
Find similar
Air Canada
Mar 28
ORD9:15 pmChicago O'Hare Intl
30h 55m
2 stops
SOF12:10 pmSofia
Apr 15
SOF1:50 pmSofia
16h 13m
2 stops
ORD10:03 pmChicago O'Hare Intl
$624
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Bulgaria 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, momondo users made 832,500 searches. Data last updated December 25, 2025.
Use the filters below to find and compare flights from Illinois to Bulgaria that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 1/30

3:50 pm-10:45 pm

1 stop22h 55m

Sofia

Tue 2/3

6:00 am-3:15 pm

2 stops41h 15m

$550

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Mon 3/30

11:25 am-8:45 am

1 stop13h 20m

Varna

Fri 4/10

9:35 am-9:40 am

1 stop32h 05m

$552

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Fri 1/30

3:50 pm-10:45 pm

1 stop22h 55m

Sofia

Tue 2/3

6:00 am-7:27 pm

2 stops21h 27m

$553

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sun 1/25

9:50 pm-6:20 pm

1 stop12h 30m

Sofia

Sun 2/8

6:10 am-1:25 pm

1 stop15h 15m

$568

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 1/15

9:50 pm-10:45 pm

1 stop16h 55m

Sofia

Thu 1/29

6:05 am-2:10 pm

1 stop16h 05m

$569

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 1/31

9:55 pm-5:50 pm

1 stop11h 55m

Sofia

Sun 2/8

2:35 pm-8:00 pm

1 stop13h 25m

$570

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Sat 2/14

2:00 pm-11:50 am

2 stops13h 50m

Sofia

Sat 2/28

6:25 am-3:20 pm

1 stop16h 55m

$572

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 2/16

6:00 pm-1:15 pm

1 stop11h 15m

Sofia

Mon 3/2

7:55 am-6:41 pm

2 stops18h 46m

$573

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Tue 3/31

1:09 pm-2:00 pm

2 stops16h 51m

Sofia

Fri 4/17

7:00 am-4:36 pm

2 stops17h 36m

$628

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Mon 3/30

1:09 pm-2:00 pm

2 stops16h 51m

Sofia

Mon 4/13

7:00 am-4:36 pm

2 stops17h 36m

$629

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Bulgaria from

How to get the cheapest flight ticket from Illinois to Bulgaria

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Bulgaria?

If you aren’t able to travel to Bulgaria during the month of February, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $587.

What is the cheapest day to depart on your flight to Bulgaria?

The cheapest day to depart from Illinois to Bulgaria is on a Thursday when prices can be found for as low as $885. On the other hand, Monday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,047.

What is the cheapest time of day to depart on your flight to Bulgaria?

In the morning is the cheapest time of day to fly from Illinois to Bulgaria when you can find flight prices for as low as $751. Flying to Bulgaria in the morning is an ideal time because this is during off-peak travel hours. Flights to Bulgaria are more costly at noon, with an average ticket price of $1,107. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

How far in advance should I book a flight to Bulgaria?

You are more likely to see cheaper flights to Bulgaria from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Bulgaria for around $753 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Bulgaria from Illinois for as low as $716 on momondo.

Can stopping save me money on Illinois to Bulgaria flights?

You could potentially save up to 14% on your flight if you consider stops on a Illinois to Bulgaria flight.

Cheap Illinois to Bulgaria flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Bulgaria

Fastest flight time

12h 30m

Direct flights

None
The fastest flight from Illinois to Bulgaria takes 12h 30m
There are no direct flights from Illinois to Bulgaria. There are no popular flight routes from Illinois to Bulgaria.
Search flight deals

  • When did momondo last update prices for flights from Illinois to Bulgaria?

    Prices for flights from Illinois to Bulgaria are refreshed on a daily basis.

  • How many operators does momondo search for flights from Illinois to Bulgaria?

  • How old do you have to be to fly from Illinois to Bulgaria?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Illinois to Bulgaria.

  • What documentation or ID do you need to fly to Bulgaria?

    The travel and health documents you'll need for your trip to Bulgaria may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Bulgaria. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Illinois to Bulgaria

Compare and see reviews for airlines that fly from Illinois to Bulgaria with momondo
Airline
Rating
Free Cancellation
Price
Turkish AirlinesPriceFrom $514Free CancellationRating
7.3
4,113 reviews
Search Turkish Airlines flights
KLMPriceFrom $569Free CancellationRating
7.7
1,434 reviews
Search KLM flights
United AirlinesPriceFrom $585Free CancellationRating
7.4
9,115 reviews
Search United Airlines flights
Air FrancePriceFrom $585Free CancellationRating
7.4
1,513 reviews
Search Air France flights
LOTPriceFrom $587Free CancellationRating
7.5
1,152 reviews
Search LOT flights
LufthansaPriceFrom $588Free CancellationRating
6.8
7,655 reviews
Search Lufthansa flights
SWISSPriceFrom $593Free CancellationRating
7.5
1,818 reviews
Search SWISS flights
Austrian AirlinesPriceFrom $606Free CancellationRating
7.6
884 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $611Free CancellationRating
6.7
7,617 reviews
Search British Airways flights
Air SerbiaPriceFrom $631Free CancellationRating
6.2
210 reviews
Search Air Serbia flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Bulgaria?

It is quick and easy to find Illinois to Bulgaria flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Bulgaria that suits you.

Can I find flights from Illinois to Bulgaria with flexible booking policies on momondo?

All flight searches from Illinois to Bulgaria on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Illinois to Bulgaria?

momondo provides multiple filters to help you find the best flight to Bulgaria from Illinois. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Illinois to Bulgaria right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Bulgaria from Illinois. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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