To save up to 26% on this flight, we recommend booking at least 21 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Illinois to New Haven from $229 1-2 weeks out and tickets from $301 for flights departing within the next 72 hours.
Flights from Illinois to New Haven lean towards being more expensive in December. Prices are generally better when you fly from Illinois to New Haven in August, with the cheapest ticket starting at $62.