Cheap flights from St. Louis to Chicago O'Hare Intl Airport
Cheapflights Tip: The best prices from Lambert-St Louis to Chicago O'Hare Intl are usually found in September or October, booked 75 days in advance, depart on a Wednesday or Thursday and return on a Monday
Cheap flight deals from St. Louis to O'Hare Intl
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to O'Hare Intl (ORD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 2 September 2025.
Popular in | July |
|---|---|
Cheapest in | September |
Average price | £156 |
Good round-trip deal | £488 or less |
Good one-way deal | £134 or less |
Best time to book a flight from St. Louis to O'Hare Intl
Have a flexible travel schedule? Discover the best time to fly to O'Hare Intl from St. Louis with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Chicago O'Hare Intl Airport
How far ahead should I book a flight from St. Louis to Chicago O'Hare Intl Airport?
The best time to book flights from St. Louis to Chicago O'Hare Intl Airport is 75 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest month to book a flight from St. Louis to Chicago O'Hare Intl Airport?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Chicago O'Hare Intl Airport (average of £595). Flying from St. Louis to Chicago O'Hare Intl Airport in July is currently the most expensive (average of £843). 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.
What is the cheapest time of day to fly from STL to ORD?
A simple way to save on the total cost of your ticket is to fly from St. Louis to Chicago O'Hare Intl Airport in the morning. If you’re flexible enough to do this you can expect to save up to 40% on your trip compared to booking a flight at midday.
What is the cheapest day to fly from St. Louis to Chicago O'Hare Intl Airport?
Travellers seeking maximum savings on their St. Louis to Chicago O'Hare Intl Airport flight should consider departing on Thursday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Related info for your journey
Find useful and relevant information for your journey from St. Louis to O'Hare Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Travelling to a place near Chicago O'Hare Intl Airport?
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Can Cheapflights notify me if prices for flights from St. Louis to O'Hare Intl become cheaper?
Not ready to book yet? You can track prices for flights from St. Louis to O'Hare Intl on Cheapflights with our Price Alert feature and get notified when better prices are available.