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Cheap flights from Illinois to Bulgaria from $298

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 4/20. 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
1 adult, Economy, 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.
Turkish Airlines Logo
11:25 am - 9:20 pm
ORD
-
VAR
25h 55m
1 stop
Turkish Airlines Logo
9:20 am - 6:15 pm
VAR
-
ORD
16h 55m
1 stop
$570Turkish Airlines
Tue, Aug 18 - Tue, Sep 22
Turkish Airlines Logo
8:10 pm - 3:00 pm
ORD
-
SOF
34h 50m
1 stop
Turkish Airlines Logo
9:05 pm - 9:40 am
SOF
-
ORD
20h 35m
1 stop
$589Turkish Airlines
Mon, Apr 13 - Wed, Apr 22
Multiple Airlines Logo
6:55 pm - 11:15 pm
STL
-
SOF
20h 20m
2 stops
Multiple Airlines Logo
6:10 am - 8:25 pm
SOF
-
STL
22h 15m
2 stops
$799Multiple Airlines
Tue, Apr 28 - Tue, May 5
United Airlines Logo
10:09 am - 11:15 pm
STL
-
SOF
29h 06m
2 stops
United Airlines Logo
6:10 am - 8:25 pm
SOF
-
STL
22h 15m
2 stops
$807United Airlines
Wed, Apr 29 - Tue, May 5
Lufthansa Logo
6:55 pm - 11:15 pm
STL
-
SOF
20h 20m
2 stops
Lufthansa Logo
6:40 pm - 1:25 pm
SOF
-
STL
26h 45m
1 stop
$816Lufthansa
Tue, Apr 28 - Tue, May 5
United Airlines Logo
6:15 am - 1:25 pm
STL
-
SOF
23h 10m
3 stops
United Airlines Logo
6:10 am - 8:25 pm
SOF
-
STL
22h 15m
2 stops
$817United Airlines
Wed, Apr 29 - Tue, May 5
Multiple Airlines Logo
11:37 am - 11:15 pm
STL
-
SOF
27h 38m
2 stops
Multiple Airlines Logo
6:55 pm - 8:25 pm
SOF
-
STL
33h 30m
2 stops
$822Multiple Airlines
Wed, Apr 29 - Mon, May 4
Austrian Airlines Logo
4:20 pm - 3:15 pm
ORD
-
VAR
14h 55m
1 stop
Austrian Airlines Logo
4:00 pm - 6:33 pm
VAR
-
ORD
34h 33m
2 stops
$825Austrian Airlines
Mon, Apr 27 - Mon, May 4
Lufthansa Logo
6:55 pm - 11:15 pm
STL
-
SOF
20h 20m
2 stops
Lufthansa Logo
7:25 pm - 11:57 pm
SOF
-
STL
36h 32m
2 stops
$831Lufthansa
Tue, Apr 28 - Mon, May 4
Austrian Airlines Logo
4:20 pm - 12:20 pm
ORD
-
BOJ
12h 00m
1 stop
Austrian Airlines Logo
1:05 pm - 1:20 pm
BOJ
-
ORD
32h 15m
1 stop
$888Austrian Airlines
Mon, Aug 17 - Sat, Sep 5

United Airlines flights from Illinois to Bulgaria

Our best United Airlines deals on Illinois to Bulgaria flight tickets
United Airlines
Apr 29
STL10:09 amLambert-St Louis
29h 06m
2 stops
SOF11:15 pmSofia
May 5
SOF6:10 amSofia
22h 15m
2 stops
STL8:25 pmLambert-St Louis
$807
United Airlines
Apr 29
STL6:15 amLambert-St Louis
23h 10m
3 stops
SOF1:25 pmSofia
May 5
SOF6:10 amSofia
22h 15m
2 stops
STL8:25 pmLambert-St Louis
$817
United Airlines
Sep 9
STL5:32 pmLambert-St Louis
17h 08m
2 stops
SOF6:40 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$837

Lufthansa flights from Illinois to Bulgaria

Our best Lufthansa deals on Illinois to Bulgaria flight tickets
Lufthansa
Apr 28
STL6:55 pmLambert-St Louis
20h 20m
2 stops
SOF11:15 pmSofia
May 5
SOF6:40 pmSofia
26h 45m
1 stop
STL1:25 pmLambert-St Louis
$816
Lufthansa
Apr 28
STL6:55 pmLambert-St Louis
20h 20m
2 stops
SOF11:15 pmSofia
May 4
SOF7:25 pmSofia
36h 32m
2 stops
STL11:57 pmLambert-St Louis
$831
Lufthansa
Apr 27
ORD4:05 pmChicago O'Hare Intl
15h 10m
2 stops
VAR3:15 pmVarna
May 4
VAR4:00 pmVarna
28h 55m
2 stops
ORD12:55 pmChicago O'Hare Intl
$833

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 April 2, 2026.
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

Cheapest round-trip

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Tue 8/18

11:25 am-9:20 pm

1 stop25h 55m

Varna

Tue 9/22

9:20 am-6:15 pm

1 stop16h 55m

$570

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 4/13

8:10 pm-3:00 pm

1 stop34h 50m

Sofia

Wed 4/22

9:05 pm-9:40 am

1 stop20h 35m

$589
Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/28

6:55 pm-11:15 pm

2 stops20h 20m

Sofia

Tue 5/5

6:10 am-8:25 pm

2 stops22h 15m

$799

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/29

10:09 am-11:15 pm

2 stops29h 06m

Sofia

Tue 5/5

6:10 am-8:25 pm

2 stops22h 15m

$807

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/28

6:55 pm-11:15 pm

2 stops20h 20m

Sofia

Tue 5/5

6:40 pm-1:25 pm

1 stop26h 45m

$816

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/29

6:15 am-1:25 pm

3 stops23h 10m

Sofia

Tue 5/5

6:10 am-8:25 pm

2 stops22h 15m

$817

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 4/29

11:37 am-11:15 pm

2 stops27h 38m

Sofia

Mon 5/4

6:55 pm-8:25 pm

2 stops33h 30m

$822

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Mon 4/27

4:20 pm-3:15 pm

1 stop14h 55m

Varna

Mon 5/4

4:00 pm-6:33 pm

2 stops34h 33m

$825

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 4/28

6:55 pm-11:15 pm

2 stops20h 20m

Sofia

Mon 5/4

7:25 pm-11:57 pm

2 stops36h 32m

$831

ChicagoBurgas

ORD - BOJ

ORDBOJ

Chicago O'Hare Intl

Mon 8/17

4:20 pm-12:20 pm

1 stop12h 00m

Bourgas

Sat 9/5

1:05 pm-1:20 pm

1 stop32h 15m

$888

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 November is also cheap. Prices for this month can be found on momondo for an average of $617.

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 $739 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 $691 on momondo.

Can stopping save me money on Illinois to Bulgaria flights?

You could potentially save up to 4% 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

11h 20m

Direct flights

None
The fastest flight from Illinois to Bulgaria takes 11h 20m
There are no direct flights from Illinois to Bulgaria. There are no popular flight routes from Illinois to Bulgaria.
Search flight deals

Frequently asked questions about flying from Illinois to Bulgaria

  • 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
KLMPriceFrom $425Free CancellationRating
7.7
1,485 reviews
Search KLM flights
ITA AirwaysPriceFrom $508Free CancellationRating
6.7
1,174 reviews
Search ITA Airways flights
Turkish AirlinesPriceFrom $521Free CancellationRating
7.3
4,293 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $561Free CancellationRating
7.4
9,532 reviews
Search United Airlines flights
SWISSPriceFrom $565Free CancellationRating
7.5
1,910 reviews
Search SWISS flights
British AirwaysPriceFrom $574Free CancellationRating
6.7
7,841 reviews
Search British Airways flights
Austrian AirlinesPriceFrom $575Free CancellationRating
7.6
904 reviews
Search Austrian Airlines flights
LufthansaPriceFrom $582Free CancellationRating
6.8
7,884 reviews
Search Lufthansa flights
LOTPriceFrom $583Free CancellationRating
7.5
1,181 reviews
Search LOT flights
Air FrancePriceFrom $585Free CancellationRating
7.4
1,561 reviews
Search Air France 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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