Cheap flights from the United States to St. Louis from $29
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from the United States to St. Louis departing on 9/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from United States to St. Louis
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to St. Louis?
In general, January is the cheapest month to fly from United States to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $300. The month of March is another great option to travel to St. Louis, with average flight prices from United States averaging around $308.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $331. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $436. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
What is the cheapest time of day to depart on your flight to St. Louis?
Flying to St. Louis from United States in the morning is the least expensive time of day to depart. momondo users have found prices as low as $348 when looking at flights departing in the morning. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $400 per ticket.
What is the cheapest United States to Lambert-St Louis flight route?
Fly from Orlando to Lambert-St Louis for the best United States - Lambert-St Louis flight prices
How far in advance should I book a flight to St. Louis?
You are more likely to see cheaper flights to St. Louis from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $328 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from United States for as low as $158 on momondo.
What cabin class options are available on United States to Lambert-St Louis flights?
There are 4 cabin classes available to choose from on United States to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from United States to Lambert-St Louis?
Frontier, American Airlines, and United Airlines are the most popular carriers operating from United States to Lambert-St Louis
What airlines fly to St. Louis?
Frontier, Southwest and American Airlines are the top three most popular airlines that fly to St. Louis from United States according to our data. Frontier is the first choice among our users, with 28% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 9 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
How many flights depart from United States to St. Louis on average per day?
97 flights are operational daily from United States to St. Louis as of July 2025. The most popular departure time for this route is 10:00PM, with 39% of flights per day taking off in the evening.
How many flights depart from United States to St. Louis on average per week?
681 flights are operational weekly from United States to St. Louis as of July 2025. The most popular departure day for this route is Mon, with 18% of flights per week taking off on this day.
Cheap United States to St. Louis flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from United States to St. Louis
When did momondo last update prices for flights from United States to Lambert-St Louis Airport?
Prices for flights from United States to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from United States to Lambert-St Louis Airport?
As of July 2025, there are 8 operators available to choose from for flights from United States to Lambert-St Louis Airport.
How old do you have to be to fly from United States to Lambert-St Louis Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from United States to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from United States to St. Louis?
Based on momondo bookings for flights between United States and St. Louis, the leading plane model is Boeing 737-800 Passenger/BBJ2 (winglets), making up 16.89% of the total bookings. Other popular models include Boeing 737-700 Passenger/BBJ1 (winglets) with 14.36%, Boeing 737 MAX 8 with 13.26%, and Embraer 175 with 11.08%.
Best airlines flying from United States to St. Louis
Compare and see reviews for airlines that fly from United States to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $22 | Free Cancellation | Rating 6.3 8,060 reviews | |||
| PriceFrom $45 | Free Cancellation | Rating 5.9 3,268 reviews | |||
| PriceFrom $133 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $150 | Free Cancellation | Rating 7.4 8,843 reviews | |||
| PriceFrom $163 | Free Cancellation | Rating 8.0 7,958 reviews | |||
| PriceFrom $177 | Free Cancellation | Rating 8.0 4,253 reviews | |||
| PriceFrom $193 | Free Cancellation | Rating 6.4 26 reviews | |||
| PriceFrom $327 | Free Cancellation | Rating 8.0 10,000 reviews |
Traveling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from United States to St. Louis?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from United States to St. Louis for you.
Can I find flights from United States to St. Louis with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to St. Louis from United States with this policy.
How can momondo help me find flights from United States to St. Louis?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from United States to St. Louis.
I’m not ready to book a flight from United States to St. Louis right now. Can momondo alert me if prices change?
If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from United States and alert you when they change.