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Cheap flights from Illinois to Bulgaria from $324

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 8/26. 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
6:01 am - 12:10 pm
STL
-
SOF
22h 09m
2 stops
United Airlines Logo
6:10 am - 5:06 pm
SOF
-
STL
18h 56m
2 stops
$783United Airlines
Mon, Aug 10 - Wed, Aug 26
Lufthansa Logo
1:13 pm - 12:10 pm
STL
-
SOF
14h 57m
2 stops
Lufthansa Logo
7:00 pm - 1:25 pm
SOF
-
STL
26h 25m
1 stop
$785Lufthansa
Mon, Aug 10 - Mon, Aug 24
Turkish Airlines Logo
11:25 am - 2:55 am
ORD
-
VAR
31h 30m
1 stop
Turkish Airlines Logo
3:45 am - 9:40 am
VAR
-
ORD
13h 55m
1 stop
$796Turkish Airlines
Thu, Sep 3 - Fri, Sep 11
Multiple Airlines Logo
12:10 pm - 6:40 pm
STL
-
SOF
22h 30m
2 stops
Multiple Airlines Logo
7:25 pm - 1:25 pm
SOF
-
STL
26h 00m
2 stops
$804Multiple Airlines
Mon, Aug 10 - Mon, Aug 24
Multiple Airlines Logo
12:10 pm - 6:40 pm
STL
-
SOF
22h 30m
2 stops
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$818Multiple Airlines
Tue, Sep 8 - Wed, Sep 16
LOT Logo
5:10 pm - 1:50 pm
ORD
-
SOF
12h 40m
1 stop
LOT Logo
2:35 pm - 3:10 pm
SOF
-
ORD
32h 35m
1 stop
$853LOT
Mon, Aug 3 - Sat, Oct 3
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
$854Turkish Airlines
Thu, Aug 13 - Thu, Aug 27
LOT Logo
5:10 pm - 1:55 am
ORD
-
SOF
24h 45m
2 stops
LOT Logo
5:25 am - 7:50 pm
SOF
-
ORD
22h 25m
1 stop
$858LOT
Thu, Aug 13 - Wed, Aug 26
KLM Logo
1:27 pm - 2:00 pm
MDW
-
SOF
16h 33m
2 stops
KLM Logo
7:00 am - 4:27 pm
SOF
-
MDW
17h 27m
2 stops
$878KLM
Sun, Aug 9 - Mon, Aug 31
KLM Logo
12:30 pm - 2:05 pm
MDW
-
SOF
17h 35m
2 stops
KLM Logo
7:00 am - 4:50 pm
SOF
-
MDW
17h 50m
2 stops
$897KLM
Tue, Nov 3 - Tue, Nov 17

LOT flights from Illinois to Bulgaria

Our best LOT deals on Illinois to Bulgaria flight tickets
LOT
Aug 3
ORD5:10 pmChicago O'Hare Intl
12h 40m
1 stop
SOF1:50 pmSofia
Oct 3
SOF2:35 pmSofia
32h 35m
1 stop
ORD3:10 pmChicago O'Hare Intl
$853
LOT
Aug 13
ORD5:10 pmChicago O'Hare Intl
24h 45m
2 stops
SOF1:55 amSofia
Aug 26
SOF5:25 amSofia
22h 25m
1 stop
ORD7:50 pmChicago O'Hare Intl
$858
LOT
Aug 23
ORD5:10 pmChicago O'Hare Intl
36h 40m
2 stops
SOF1:50 pmSofia
Sep 6
SOF2:35 pmSofia
13h 15m
1 stop
ORD7:50 pmChicago O'Hare Intl
$862

Lufthansa flights from Illinois to Bulgaria

Our best Lufthansa deals on Illinois to Bulgaria flight tickets
Lufthansa
Aug 10
STL1:13 pmLambert-St Louis
14h 57m
2 stops
SOF12:10 pmSofia
Aug 24
SOF7:00 pmSofia
26h 25m
1 stop
STL1:25 pmLambert-St Louis
$785
Lufthansa
Aug 11
STL12:59 pmLambert-St Louis
26h 16m
2 stops
SOF11:15 pmSofia
Aug 24
SOF7:00 pmSofia
26h 25m
1 stop
STL1:25 pmLambert-St Louis
$796
Lufthansa
Aug 10
STL3:30 pmLambert-St Louis
13h 55m
1 stop
SOF1:25 pmSofia
Aug 24
SOF7:00 pmSofia
26h 25m
1 stop
STL1:25 pmLambert-St Louis
$799

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 May 16, 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

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 8/10

6:01 am-12:10 pm

2 stops22h 09m

Sofia

Wed 8/26

6:10 am-5:06 pm

2 stops18h 56m

$783

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 8/10

1:13 pm-12:10 pm

2 stops14h 57m

Sofia

Mon 8/24

7:00 pm-1:25 pm

1 stop26h 25m

$785

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

Thu 9/3

11:25 am-2:55 am

1 stop31h 30m

Varna

Fri 9/11

3:45 am-9:40 am

1 stop13h 55m

$796

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Mon 8/10

12:10 pm-6:40 pm

2 stops22h 30m

Sofia

Mon 8/24

7:25 pm-1:25 pm

2 stops26h 00m

$804

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 9/8

12:10 pm-6:40 pm

2 stops22h 30m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$818

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Mon 8/3

5:10 pm-1:50 pm

1 stop12h 40m

Sofia

Sat 10/3

2:35 pm-3:10 pm

1 stop32h 35m

$853

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 8/13

8:10 pm-3:00 pm

1 stop34h 50m

Sofia

Thu 8/27

9:05 pm-9:40 am

1 stop20h 35m

$854

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

Thu 8/13

5:10 pm-1:55 am

2 stops24h 45m

Sofia

Wed 8/26

5:25 am-7:50 pm

1 stop22h 25m

$858
Quickest round-trip

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Sun 8/9

1:27 pm-2:00 pm

2 stops16h 33m

Sofia

Mon 8/31

7:00 am-4:27 pm

2 stops17h 27m

$878

ChicagoSofia

MDW - SOF

MDWSOF

Chicago Midway

Tue 11/3

12:30 pm-2:05 pm

2 stops17h 35m

Sofia

Tue 11/17

7:00 am-4:50 pm

2 stops17h 50m

$897

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 October, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $429.

How far in advance should I book a flight from Illinois 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 $752 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 $706 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

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
7.8
1,517 reviews
Search KLM flights
ITA AirwaysPriceFrom $508Free CancellationRating
6.7
1,217 reviews
Search ITA Airways flights
Turkish AirlinesPriceFrom $521Free CancellationRating
7.4
4,368 reviews
Search Turkish Airlines flights
United AirlinesPriceFrom $561Free CancellationRating
7.4
9,727 reviews
Search United Airlines flights
SWISSPriceFrom $564Free CancellationRating
7.5
1,946 reviews
Search SWISS flights
LufthansaPriceFrom $580Free CancellationRating
6.8
8,004 reviews
Search Lufthansa flights
LOTPriceFrom $581Free CancellationRating
7.5
1,190 reviews
Search LOT flights
Air FrancePriceFrom $585Free CancellationRating
7.4
1,587 reviews
Search Air France flights
Austrian AirlinesPriceFrom $587Free CancellationRating
7.6
914 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $609Free CancellationRating
6.7
7,982 reviews
Search British Airways 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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