Your next trip, last seen at €49
Lowest observedWhen to fly
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The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Lowest observed
- €49, departing 16 Nov 2026 (Last checked: 29 Oct 2026)One-way fare · Priced departure days checked in the last 14 days: 18Check live prices for this route
- Non-stop
- Yes
About this route
Explore the fares we observed from Chicago to St Louis. Prices move often, so pick your dates to see the latest options.
- Route distance
- 422 km
- Alternative airports
- CGX, DPA, MDW, PWK, RFD, SUS
Route-level information; individual journeys vary.
Published schedules report non-stop service with American Airlines, Southwest Airlines. Check current timetables.
A clearer picture of your fare
Airport to city: straight-line distance
- Chicago Midway International Airport (MDW) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 14 km.
- Chicago O'Hare International Airport (ORD) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 25 km.
- Chicago Rockford International Airport (RFD) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 126 km.
- St. Louis Lambert International Airport (STL) → St Louis, city gazetteer reference point (38.6270, -90.1994): ≈ 20 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by day of the week
Cheapest day of the week from Chicago to St Louis: Monday, from €49 (checked 29 Oct 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €49 | 4 |
| Thursday | €90 | 3 |
| Sunday | €93 | 3 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from Chicago to St Louis by days until departure (8 to 30 days): €49 (checked 29 Oct 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 0 to 7 days | €87 | 6 |
| 8 to 30 days | €49 | 11 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Frequently asked
How much is a flight from Chicago to St Louis?
The lowest fare Routavio has observed is €49, found on 29 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from Chicago to St Louis?
In our observations November 2026 is the cheapest month so far, at €49.
Are there direct flights from Chicago to St Louis?
Yes. Published schedules report non-stop flights on this route with American Airlines, Southwest Airlines.
How many of the observed Chicago to St Louis fares were non-stop?
17 of the 18 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
Which day of the week is cheapest from Chicago to St Louis?
Cheapest day of the week from Chicago to St Louis: Monday, from €49 (checked 29 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
Keep exploring
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Recently observed fares. Prices may change.
Last checked: 29 Oct 2026