CA $168 Cheap Flights from Chicago (ORD) to St. Louis (STL)

You can find one-way and return flights from Chicago, IL (ORD) to St. Louis, MO (STL) with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when ORD to STL ticket fares go up or down.

October is typically the cheapest month to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), with average return fares around CA$321. October often sees lower prices as the peak summer travel season has ended, and the holiday rush hasn't yet begun, leading to less demand. Other cheap months to fly from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) include April and August.

There are 2 airlines offering direct flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.). Here are the carriers:
* United operates 95 direct flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) every week.
* American Airlines operates 51 direct flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) every week.

To find a cheap flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.

The best airline to fly with from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will differ from traveler to traveler. If you like to fly early, United offers early morning flights. If price is the most important factor, American Airlines typically offers the lowest fares. Delta offers the most daily flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.

The cheapest months to fly from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) are typically October and April, with average return flights costing around CA$321. These months offer a good balance of more affordable fares and pleasant weather for your trip.

You'll find around 21 nonstop flights per day from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.). For even more choices, look at flights that include layovers, as there are approximately 69 connecting flights per day. Some common connection points include Hartsfield-Jackson Atlanta Intl. (ATL), Dallas-Fort Worth Intl. (DFW), and Charlotte-Douglas Intl. (CLT).

The earliest flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically departs at around 5:00 AM local time, operated by American Airlines. This is a seasonal service active in February and March. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.

You'll find the most flights from Chicago O'Hare International Airport (ORD) to St. Louis Lambert International Airport (STL) on Thursdays, with around 55 flights available. This gives you a good selection of options if you're planning to travel mid-week. Major airlines on this route include American Airlines, Delta, and United.

The most popular departure times for flights from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) are in the morning, from 6am to 9am. Many major carriers, including American Airlines, Delta and United, offer flights during this window. Many travelers prefer these early morning flights as they allow you to arrive at your destination with plenty of time for business or leisure activities.

A direct flight from Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically takes around 1 hour 30 minutes. This route covers a distance of approximately 415 kilometres. If you opt for a flight with one stop, your journey will usually be longer, taking about 6 hours 18 minutes. Flights with two or more stops generally take around 8 hours. Keep in mind that actual flight times can vary due to factors like routing, weather, and wind patterns.

You can fly business class or first class between ORD and STL. Airlines that offer business class service on this route include:

* Frontier Airlines
* Delta

First class cabins are available on:

* Alaska Airlines
* Delta
* United
* American Airlines

It's easy to earn miles on a Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.

*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.

If you're planning to travel to St. Louis from O'Hare Intl. (ORD), you can fly directly into Lambert-St. Louis Intl. (STL). Some flights may connect through major hubs like Love Field (DAL), Harry Reid International Airport (LAS), or Denver Intl. (DEN) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Typically, booking a last minute flight from Chicago, IL (ORD) to St. Louis, MO (STL) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.

Securing a Chicago, IL (ORD) to St. Louis, MO (STL) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.

If you booked your Chicago, IL (ORD-O'Hare Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.