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

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 Illinois to Bucharest.

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

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

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 to Bucharest with an airline and back to Illinois with another airline.

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

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

$301 CHEAP FLIGHTS from Illinois to Bucharest (OTP)

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Flight Deals

Cheap Flights from Illinois to Bucharest

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Illinois to Bucharest

Sun, Mar 7 - Wed, Mar 17

2:00 pm - 3:05 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

17h 05m2 stops Philadelphia London Heathrow

8:25 am - 11:58 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

22h 33m2 stops London Heathrow Chicago O'Hare Intl

$636British Airways

Sun, Mar 7 - Wed, Mar 17

2:00 pm - 3:05 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

17h 05m2 stops Philadelphia London Heathrow

8:25 am - 11:34 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

22h 09m2 stops London Heathrow Dallas/Fort Worth

$636British Airways

Wed, Oct 28 - Wed, Nov 4

12:47 pm - 3:45 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

19h 58m2 stops Dallas/Fort Worth London Heathrow

8:25 am - 11:33 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

23h 08m2 stops London Heathrow Dallas/Fort Worth

$637American Airlines

Sun, Mar 7 - Wed, Mar 17

11:31 am - 3:05 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

19h 34m2 stops Chicago O'Hare Intl London Heathrow

8:25 am - 11:34 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

22h 09m2 stops London Heathrow Dallas/Fort Worth

$642American Airlines

Wed, Oct 28 - Wed, Nov 4

4:40 pm - 1:55 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

14h 15m1 stop Frankfurt am Main

6:00 am - 1:45 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

15h 45m1 stop Frankfurt am Main

$669Lufthansa

Sun, Mar 7 - Wed, Mar 17

3:40 pm - 1:55 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

14h 15m1 stop Frankfurt am Main

6:00 am - 2:45 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

15h 45m1 stop Frankfurt am Main

$677Lufthansa

Fri, Oct 30 - Fri, Nov 6

4:40 pm - 1:55 pmSTL Lambert-St Louis-OTP Bucharest Otopeni Intl

14h 15m1 stop Frankfurt am Main

6:00 am - 3:26 pmOTP Bucharest Otopeni Intl-STL Lambert-St Louis

41h 26m2 stops Munich Franz Josef Strauss Toronto Pearson Intl

$707United Airlines

Mon, Nov 16 - Sun, Nov 29

9:50 pm - 6:30 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

12h 40m1 stop Munich Franz Josef Strauss

4:40 pm - 4:15 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

31h 35m1 stop Zurich

$712Multiple Airlines

Mon, Nov 16 - Sun, Nov 29

9:50 pm - 6:30 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

12h 40m1 stop Munich Franz Josef Strauss

4:40 pm - 4:15 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

31h 35m1 stop Zurich

$713Multiple Airlines

Sun, Dec 13 - Mon, Jan 11

11:10 am - 1:55 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

18h 45m2 stops Philadelphia Frankfurt am Main

2:40 pm - 3:20 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

32h 40m1 stop Frankfurt am Main

$718United Airlines

Recent last minute flight deals from Illinois to Bucharest

Sat, Sep 19 - Sat, Oct 10

11:20 pm - 3:05 amORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

19h 45m1 stop Belgrade Nikola Tesla

4:05 pm - 9:15 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

13h 10m1 stop Belgrade Nikola Tesla

$788Air Serbia

Mon, Sep 21 - Fri, Oct 9

10:25 pm - 1:20 amORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

18h 55m1 stop London Heathrow

3:30 pm - 12:30 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

29h 00m1 stop London Heathrow

$828American Airlines

Mon, Sep 21 - Fri, Oct 9

3:45 pm - 11:10 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

23h 25m2 stops Toronto Pearson Intl Barcelona-El Prat

6:15 pm - 12:35 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

26h 20m2 stops Barcelona-El Prat Zurich

$903Multiple Airlines

Mon, Sep 21 - Fri, Oct 9

3:45 pm - 11:10 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

23h 25m2 stops Toronto Pearson Intl Barcelona-El Prat

4:05 pm - 12:35 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

28h 30m3 stops Belgrade Nikola Tesla Barcelona-El Prat Zurich

$965Multiple Airlines

Sat, Sep 19 - Sat, Jun 12

11:20 pm - 3:05 amORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

19h 45m1 stop Belgrade Nikola Tesla

4:05 pm - 9:15 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

13h 10m1 stop Belgrade Nikola Tesla

$1,000Air Serbia

Sat, Sep 19 - Wed, Jun 16

7:05 pm - 1:10 amORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

22h 05m1 stop Zurich

4:10 pm - 3:55 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

31h 45m1 stop Zurich

$1,007SWISS

Sun, Sep 20 - Thu, Jun 17

5:10 pm - 11:25 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

22h 15m1 stop Paris Charles de Gaulle

1:55 pm - 2:15 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

32h 20m1 stop Amsterdam Schiphol

$1,032Delta

Sun, Sep 20 - Fri, Jun 18

5:10 pm - 11:25 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

22h 15m1 stop Paris Charles de Gaulle

7:05 am - 2:15 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

15h 10m1 stop Amsterdam Schiphol

$1,032Delta

Sat, Sep 19 - Sat, Sep 26

7:05 pm - 3:20 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

12h 15m1 stop Zurich

6:20 am - 3:55 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

17h 35m1 stop Zurich

$1,058SWISS

Sat, Sep 19 - Sat, Oct 10

11:37 am - 2:00 pmORD Chicago O'Hare Intl-OTP Bucharest Otopeni Intl

18h 23m2 stops New York John F Kennedy Intl London Heathrow

8:15 am - 9:54 pmOTP Bucharest Otopeni Intl-ORD Chicago O'Hare Intl

21h 39m2 stops London Heathrow Raleigh-Durham

$1,172American Airlines

Useful Info

Low season	February
High season	July
Cheapest flight	$301

Best time to beat the crowds with an average 23% drop in price.

Most popular time to fly with an average 28% increase in price.

Flight from Chicago O'Hare Airport to Bucharest

How does KAYAK find such low prices on flights from Illinois to Bucharest?
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 Illinois to Bucharest.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Bucharest?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Bucharest from 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 Illinois to Bucharest?
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 to Bucharest with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Bucharest?
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 to Bucharest from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.