Open interactive map →Cheap flights from Chicago to Saint Louis
Cheap flights from Chicago to Saint Louis, United States currently start at €51. Multiple carriers serve this route at competitive fares. Non-stop flights are available on this route, cutting total travel time significantly. Browse the month-by-month price calendar below to find when fares are lowest, then click through to book.
The cheapest fares on popular routes like this tend to sell out first, so it pays to book early once you spot a good price. Early-morning and late-night departures from Chicago are often priced lower than midday flights. SkyHopp refreshes fares regularly - if the current price doesn't fit your budget, check back in a few days as availability changes.
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Cheapest month to fly
- October 2026€51DirectCheapest
Based on tracked fares, October is the cheapest month to fly this route at around €51.
Prices last updated: September 2026
Entry requirements for United States
EU passportESTA required (visa-waiver)
US passportN/A (domestic)
Requirements vary by nationality and change without notice. Check requirements for your nationality →
Alternative routes
Other ways to reach Saint Louis
Frequently asked questions
How much does a flight from Chicago to Saint Louis cost?
The cheapest fare currently available from Chicago to Saint Louis is €51. Prices on this route vary by season, day of week, and how far in advance you book. The month-by-month price calendar on this page shows exactly when fares are highest and lowest, so you can pick the most cost-effective window before searching for specific dates. Fares are refreshed regularly as our flight partners publish new availability.
Are there direct flights from Chicago to Saint Louis?
Yes - non-stop flights are currently available from Chicago to Saint Louis. The cheapest direct fare starts at €51, making it a convenient option if you want to avoid layover time. Direct flights are generally quicker and less stressful, especially for shorter trips to United States. Click through to the booking site to check live availability and schedules for your dates.
When is the cheapest time to fly from Chicago to Saint Louis?
Prices on this route typically dip during shoulder-season months, away from school holidays and public holiday windows. Mid-week departures - particularly Tuesday to Thursday - tend to be cheaper than flights on Fridays and Sundays from Chicago. The month-by-month price calendar above is the fastest way to identify the cheapest window - look for the months with the lowest fares before committing to travel dates. Booking 3-6 weeks in advance generally offers the best balance of price and seat availability on this route.