Cheap flights from St. Louis (STL) to Illinois from $44

Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to Illinois from St. Louis.

Yes, there are multiple flights from St. Louis to Illinois for under $100. The cheapest flight booked recently is on Southern / Mokulele for just $84, but on average you can expect to pay $118.

Cheapflights has at least 20 direct flights from St. Louis to Illinois under $100. A good price for a nonstop flight from St. Louis to Illinois is less than $165.

There are currently 20+ open flights from St. Louis to Illinois within the next 7 days for less than $200.

You can find nonstop flights on the following days: Sunday, Friday, Saturday.

On average 12 flights depart from St. Louis to Illinois per day.
Early Morning (Midnight to 6am) - 17% of flight departures
Morning (6am - Noon) - 83% of flight departures

A quick flight from St. Louis to Illinois can take about 50m. Southern / Mokulele provides one of the quickest options available for as low as $84. St. Louis and Illinois are separated by a distance of 259 mi. All flights are typically nonstop.

For one-way options, check prices for Southern / Mokulele. According to our data, you can fly for as low as $44. Users have also found prices from $50 and $78 on American Airlines and Delta, respectively.

Most travelers choose Lambert-St Louis - Chicago O'Hare Intl, Lambert-St Louis - Chicago Midway or Lambert-St Louis - Quincy Regional when deciding on the best route from St. Louis to Illinois.

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to Illinois on time: Sun Country Air (100%), Copa Airlines (100%), Austrian Airlines (98%).

The cheapest flight price from St. Louis to Illinois is $108. On average you can expect to pay $1,878. The most popular route, (Lambert-St Louis - Chicago O'Hare Intl), can usually be booked for $114.

These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Lambert-St Louis Airport to Chicago O'Hare Intl Airport flight would often be abbreviated as a STL to ORD flight. While you’re still figuring out your travel plans, it’s not a bad idea to learn the names and codes of other airports around these areas: Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI).

The amount of baggage you can bring on your St. Louis to Illinois flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

Yes, Cheapflights allows you to browse and filter St. Louis to Illinois flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

Yes. In addition to deals on St. Louis to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Illinois.

Yes. Cheapflights offers flight deals from St. Louis to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Many airlines flying from St. Louis to Illinois offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

Yes, you can often find last-minute deals on St. Louis to Illinois flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

The St. Louis to Illinois flight deals you see on this page were last updated on 5/28.

The most popular airlines flying from St. Louis to Illinois are Southern / Mokulele, American Airlines and United Airlines. Something to consider prior to booking your flight.

Currently, February is the cheapest month in which you can book a flight from St. Louis to Illinois (average of $244). Flying from St. Louis to Illinois in June is currently the most expensive (average of $326). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.