How to find the cheapest flight from
Colorado to Illinois
How far in advance should I book a flight from Colorado to Illinois?
When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 37 days in advance, which can save you up to 10% on flights from Colorado to Illinois compared to booking the week you need them. Waiting 37 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $177. For sooner than that we have options available in the next 3 days from $177.
One-way flights to Illinois from Colorado
The cheapest one-way flights from Colorado to Illinois
1:53 am - 5:20 am
6:04 am - 2:28 pm
8:20 am - 11:56 am
Related info for your journey
Useful info, stats and facts about Colorado to Illinois flights.
Destination information for Illinois
Things to know before you go. Useful info for your trip from Colorado to Illinois
Colorado Springs (COS)