Cheap flights to Illinois, United States

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Cheapest month to fly to Illinois

Explore price trends for trips to Illinois

Annual Avg. Price277 USD
September 2025266 USD
October 2025355 USD
November 2025212 USD
December 202552 USD
January 2026226 USD
February 2026273 USD
March 2026273 USD
April 2026123 USD
May 2026300 USD
June 2026333 USD
July 2026444 USD
August 2026466 USD

Illinois - popular routes

Flights to Illinois

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