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Cheap flights from Illinois to Bulgaria from $331

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 4/14. 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.
Lufthansa Logo
6:42 pm - 10:45 pmSTL-SOF
20h 03m2 stops
Lufthansa Logo
1:45 pm - 11:42 pmSOF-STL
17h 57m2 stops
$516Lufthansa
Find Deal
lun., dic. 8 - lun., dic. 15
Lufthansa Logo
6:40 pm - 6:20 pmSTL-SOF
15h 40m2 stops
Lufthansa Logo
6:10 am - 11:59 pmSOF-STL
25h 49m2 stops
$534Lufthansa
Find Deal
mié., ene. 7 - mié., ene. 14
United Airlines Logo
11:20 am - 10:45 pmSTL-SOF
27h 25m2 stops
United Airlines Logo
6:00 am - 3:29 pmSOF-STL
41h 29m2 stops
$539United Airlines
Find Deal
mié., ene. 7 - mar., ene. 13
Lufthansa Logo
3:50 pm - 1:35 pmSTL-SOF
13h 45m1 stop
Lufthansa Logo
6:10 am - 11:59 pmSOF-STL
25h 49m2 stops
$542Lufthansa
Find Deal
vie., ene. 23 - dom., feb. 1
United Airlines Logo
8:30 am - 10:45 pmSTL-SOF
30h 15m2 stops
United Airlines Logo
6:10 am - 9:13 pmSOF-STL
23h 03m2 stops
$543United Airlines
Find Deal
mié., ene. 7 - vie., ene. 16
Multiple Airlines Logo
3:35 pm - 11:30 pmORD-SOF
23h 55m2 stops
Multiple Airlines Logo
2:35 pm - 4:20 pmSOF-ORD
33h 45m2 stops
$563Multiple Airlines
Find Deal
lun., dic. 1 - lun., dic. 15
British Airways Logo
10:47 am - 1:00 pmSTL-SOF
18h 13m2 stops
British Airways Logo
12:05 pm - 11:38 pmSOF-STL
43h 33m2 stops
$568British Airways
Find Deal
sáb., dic. 6 - sáb., dic. 13
Multiple Airlines Logo
6:50 pm - 10:15 amORD-SOF
31h 25m1 stop
Multiple Airlines Logo
2:35 pm - 8:05 pmSOF-ORD
13h 30m1 stop
$579Multiple Airlines
Find Deal
vie., nov. 28 - vie., dic. 12
Turkish Airlines Logo
11:50 am - 8:50 pmORD-SOF
25h 00m1 stop
Turkish Airlines Logo
9:35 am - 6:25 pmSOF-ORD
16h 50m1 stop
$580Turkish Airlines
Find Deal
jue., ene. 8 - mar., feb. 3
Turkish Airlines Logo
11:50 am - 8:35 pmORD-VAR
24h 45m1 stop
Turkish Airlines Logo
10:00 am - 10:05 amVAR-ORD
32h 05m1 stop
$727Turkish Airlines
Find Deal
mié., dic. 3 - dom., dic. 7

Lufthansa flights from Illinois to Bulgaria

Our best Lufthansa deals on Illinois to Bulgaria flight tickets
Lufthansa
Dec 8
STL6:42 pmLambert-St Louis
20h 03m
2 stops
SOF10:45 pmSofia
Dec 15
SOF1:45 pmSofia
17h 57m
2 stops
STL11:42 pmLambert-St Louis
$516
Find similar
Lufthansa
Jan 7
STL6:40 pmLambert-St Louis
15h 40m
2 stops
SOF6:20 pmSofia
Jan 14
SOF6:10 amSofia
25h 49m
2 stops
STL11:59 pmLambert-St Louis
$534
Find similar
Lufthansa
Jan 23
STL3:50 pmLambert-St Louis
13h 45m
1 stop
SOF1:35 pmSofia
Feb 1
SOF6:10 amSofia
25h 49m
2 stops
STL11:59 pmLambert-St Louis
$542
Find similar

United Airlines flights from Illinois to Bulgaria

Our best United Airlines deals on Illinois to Bulgaria flight tickets
United Airlines
Jan 7
STL11:20 amLambert-St Louis
27h 25m
2 stops
SOF10:45 pmSofia
Jan 13
SOF6:00 amSofia
41h 29m
2 stops
STL3:29 pmLambert-St Louis
$539
Find similar
United Airlines
Jan 7
STL8:30 amLambert-St Louis
30h 15m
2 stops
SOF10:45 pmSofia
Jan 16
SOF6:10 amSofia
23h 03m
2 stops
STL9:13 pmLambert-St Louis
$543
Find similar
United Airlines
Jan 8
STL11:20 amLambert-St Louis
27h 25m
2 stops
SOF10:45 pmSofia
Jan 14
SOF6:05 amSofia
23h 08m
2 stops
STL9:13 pmLambert-St Louis
$545
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 noviembre 10, 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

lun. 12/8

6:42 pm-10:45 pm

2 stops20h 03m

Sofia

lun. 12/15

1:45 pm-11:42 pm

2 stops17h 57m

$516

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

mié. 1/7

6:40 pm-6:20 pm

2 stops15h 40m

Sofia

mié. 1/14

6:10 am-11:59 pm

2 stops25h 49m

$534

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

mié. 1/7

11:20 am-10:45 pm

2 stops27h 25m

Sofia

mar. 1/13

6:00 am-3:29 pm

2 stops41h 29m

$539

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

vie. 1/23

3:50 pm-1:35 pm

1 stop13h 45m

Sofia

dom. 2/1

6:10 am-11:59 pm

2 stops25h 49m

$542

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

mié. 1/7

8:30 am-10:45 pm

2 stops30h 15m

Sofia

vie. 1/16

6:10 am-9:13 pm

2 stops23h 03m

$543

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

lun. 12/1

3:35 pm-11:30 pm

2 stops23h 55m

Sofia

lun. 12/15

2:35 pm-4:20 pm

2 stops33h 45m

$563

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

sáb. 12/6

10:47 am-1:00 pm

2 stops18h 13m

Sofia

sáb. 12/13

12:05 pm-11:38 pm

2 stops43h 33m

$568

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

vie. 11/28

6:50 pm-10:15 am

1 stop31h 25m

Sofia

vie. 12/12

2:35 pm-8:05 pm

1 stop13h 30m

$579

ChicagoSofia

ORD - SOF

ORDSOF

Chicago O'Hare Intl

jue. 1/8

11:50 am-8:50 pm

1 stop25h 00m

Sofia

mar. 2/3

9:35 am-6:25 pm

1 stop16h 50m

$580

ChicagoVarna

ORD - VAR

ORDVAR

Chicago O'Hare Intl

mié. 12/3

11:50 am-8:35 pm

1 stop24h 45m

Varna

dom. 12/7

10:00 am-10:05 am

1 stop32h 05m

$727

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 $759 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 $713 on momondo.

Can stopping save me money on Illinois to Bulgaria flights?

You could potentially save up to 36% 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

Direct flights

None
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 $511Free CancellationRating
7.3
4,040 reviews
Search Turkish Airlines flights
KLMPriceFrom $533Free CancellationRating
7.7
1,410 reviews
Search KLM flights
LOTPriceFrom $570Free CancellationRating
7.6
1,135 reviews
Search LOT flights
Air FrancePriceFrom $585Free CancellationRating
7.4
1,486 reviews
Search Air France flights
LufthansaPriceFrom $590Free CancellationRating
6.8
7,565 reviews
Search Lufthansa flights
SWISSPriceFrom $593Free CancellationRating
7.5
1,781 reviews
Search SWISS flights
United AirlinesPriceFrom $600Free CancellationRating
7.4
9,012 reviews
Search United Airlines flights
Austrian AirlinesPriceFrom $606Free CancellationRating
7.6
864 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $611Free CancellationRating
6.7
7,510 reviews
Search British Airways flights
Air SerbiaPriceFrom $634Free CancellationRating
6.2
207 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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mié. 12/10
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