$383 Find Cheap Flights from Sofia to Illinois - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Sofia to Illinois departing on 9/28. 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, 0 bags

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Cheap Flights from Sofia to Illinois

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$799
St. Louis
St. Louis2 stops$1,248
Chicago
Chicago1 stop$799
St. Louis
St. Louis2 stops$1,248

Book Cheap Sofia to Illinois Plane Tickets

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

Wed, Sep 9 - Thu, Oct 22
LOT Logo
6:45 pm - 3:10 pm
SOF
-
ORD
52h 25m
2 stops
LOT Logo
5:10 pm - 6:00 pm
ORD
-
SOF
16h 50m
2 stops
$800LOT
Fri, Sep 11 - Thu, Oct 22
LOT Logo
2:35 pm - 7:50 pm
SOF
-
ORD
13h 15m
1 stop
LOT Logo
9:50 pm - 6:00 pm
ORD
-
SOF
12h 10m
1 stop
$800LOT
Wed, Sep 30 - Sun, Mar 28
Multiple Airlines Logo
7:10 pm - 10:59 pm
SOF
-
ORD
35h 49m
2 stops
Multiple Airlines Logo
3:35 pm - 12:10 pm
ORD
-
SOF
12h 35m
1 stop
$802Multiple Airlines
Wed, Sep 30 - Wed, Mar 31
Multiple Airlines Logo
7:10 pm - 10:59 pm
SOF
-
ORD
35h 49m
2 stops
Multiple Airlines Logo
3:35 pm - 12:10 pm
ORD
-
SOF
12h 35m
1 stop
$803Multiple Airlines
Thu, Sep 10 - Sun, Jan 17
Turkish Airlines Logo
3:50 pm - 9:40 am
SOF
-
ORD
25h 50m
1 stop
Turkish Airlines Logo
11:45 am - 8:50 am
ORD
-
SOF
13h 05m
1 stop
$809Turkish Airlines
Fri, Oct 23 - Sun, Nov 1
Lufthansa Logo
2:10 pm - 7:55 pm
SOF
-
ORD
13h 45m
1 stop
Lufthansa Logo
6:00 pm - 1:15 pm
ORD
-
SOF
11h 15m
1 stop
$824Lufthansa
Mon, Sep 21 - Wed, Mar 10
Turkish Airlines Logo
9:10 pm - 9:40 am
SOF
-
ORD
20h 30m
1 stop
Turkish Airlines Logo
9:15 pm - 11:05 am
ORD
-
SOF
29h 50m
1 stop
$838Turkish Airlines
Sat, Oct 3 - Tue, Mar 30
Lufthansa Logo
6:20 am - 7:46 pm
SOF
-
ORD
21h 26m
2 stops
Lufthansa Logo
3:35 pm - 12:10 pm
ORD
-
SOF
12h 35m
1 stop
$840Lufthansa
Thu, Sep 24 - Wed, Oct 7
United Airlines Logo
6:30 am - 2:55 pm
SOF
-
ORD
16h 25m
1 stop
United Airlines Logo
3:35 pm - 12:10 pm
ORD
-
SOF
12h 35m
1 stop
$849United Airlines
Thu, Sep 17 - Sat, Oct 3
United Airlines Logo
6:30 am - 2:52 pm
SOF
-
ORD
16h 22m
2 stops
United Airlines Logo
12:55 pm - 11:40 am
ORD
-
SOF
14h 45m
2 stops
$849United Airlines
Booking Insights

KAYAK's insights & trends for Sofia to Illinois flights

Get data-powered insights and trends into flights from Sofia to Illinois to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Sofia to Illinois?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Sofia to Illinois departing in December.

Flight prices are below average for this route right now.

Flights to Illinois from Sofia usually cost between $824 and $991 in December.
The lowest price found in the past 5 days was $799 on LOT (Dec 22-Jan 5).

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Sofia to Illinois, 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 Sofia to Illinois is December, when tickets cost $750 (return) on average. On the other hand, the most expensive months are August and July, when the average cost of round-trip tickets is $878 and $865 respectively.

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

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Sofia to Illinois, 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 Sofia to Illinois, you should book around 5 weeks before departure, which saves you about 11% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.

Find deals

Good to know

Low season

February

Cheapest flight

$383
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Sofia to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Sofia to Illinois?

    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 Sofia to Illinois.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Sofia to Illinois 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 Sofia to Illinois?

    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 from Sofia to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Sofia to Illinois?

    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 from Sofia to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Everything you need to know for your flight from Sofia to Illinois

Information on your arrival and departure airports

Sofia (SOF)