Cheap Flights to St. Louis County from $44

Plan your trip for September if you want to land a deal on your fare. It's the cheapest month to fly to St. Louis County. Try to avoid traveling during busy periods such as public holidays or school breaks.

Land cheap flights to St. Louis County from Chicago, Dallas and Denver. These cities typically offer the lowest fares to this popular destination. But keep in mind that stopovers, holiday periods and demand will also influence rates, so stay flexible and book when you see a bargain.

There are 55 US cities that you can fly to St. Louis County nonstop from. Compare the options by using the "Direct flights only" filter on Expedia and pick the ideal starting point for you. Here are a handful of the top cities to head out from:

• Chicago
• Dallas
• Denver
• New York
• Atlanta

If you're looking for cheap flights to St. Louis County, consider traveling outside of peak season. Booking as early as possible may also save you money. Or, look for departures on a different day — Thursday flights are on average 16% cheaper than Sunday departures.* Opt to receive flight price alerts on the Expedia app and get notifications when fares drop.

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

While booking in advance is generally the easiest way to save money, don't panic if your St. Louis County vacation is last minute. You can still find cheap flights to St. Louis County, especially if your plans have a little wiggle room. Try switching up your travel dates, exploring different ticket types or departing from an alternative hub.

Secure your flight to St. Louis County two to four months ahead if you're jetting in from an international destination. For domestic travel, the recommendation is around 28 days in advance. Cheaper tickets and a wider variety of travel dates, schedules and seating options are just some of the advantages of booking early.*

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

Sundays are usually the best day to book a cheap flight to St. Louis County, where you can save 8% on average compared to Fridays. If you choose to purchase tickets on a Friday, be ready to pay a higher price as this is typically the most expensive day.*

*Best day of the week to book, depart and ideal booking window recommendations based on average round-trip ticket prices for January through August 2023, sourced from Airline Reporting Corporation's (ARC) global airline sales database. Percentages noted are averages.

Lock in the aisle seat or window seat and fly to St. Louis County with either of these well-known carriers:

• American Airlines - 927 flights to St. Louis County each month, including 927 flights to Lambert-St. Louis Intl. Airport (STL) per month.
• Delta Air Lines - 637 flights to St. Louis County each month, including 637 flights to Lambert-St. Louis Intl. Airport (STL) per month.

Bundle your flight and hotel and you could save hundreds of dollars. Better still, you can add extras like activities and car rentals to your St. Louis County, Missouri flight and hotel package deal. With Expedia, it's a breeze to book all your St. Louis County travel plans in the same place.

You can usually cancel or change your flight to St. Louis County within 24 hours of booking. However, keep in mind that some fares are non-refundable. In those cases, you may receive a credit toward a future trip rather than a direct refund. Remember to check the airline's terms and conditions in your itinerary for exact details. You can use Expedia's "No cancel fee" or "Changes included" filters during your search to secure cheap flights to St. Louis County with flexible change policies. To learn more, head to our Customer Service Portal.