Search our Illinois flight directory to get cheap tickets to destinations in Illinois. Be it a business trip or a holiday, book cheap flights to Illinois on Cheapoair.co.uk and save big! Cities in IllinoisAuroraBellevilleBloomington-NormalChampaignChicagoDecaturMarionMattoonMolineMount VernonPeoriaQuincyRockfordSpringfieldTop Cities in IllinoisBellevilleBloomington-NormalChampaignChicagoDecaturMarionMattoonMolinePeoriaQuincyRockfordSpringfield