$139 Cheap Flights from Mason City (MCW) to St. Louis (STL)

View $139 flight on Wed, Aug 6, 2025Opens in a new window

Popular airlines from Mason City, IA (MCW-Mason City Municipal) to St. Louis Lambert Intl. Airport (STL)

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Cheap Flights from Mason City to St. Louis (MCW-STL)

Prices were available within the past 7 days and start at $139 for one-way flights and $274 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Thu, Jul 31 - Fri, Aug 8
MCW
Mason City
STL
St. Louis
$274 Roundtrip, found 6 days ago
$274
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jul 31 from Mason City to St. Louis, returning Fri, Aug 8, priced at $274 found 6 days ago
United
Thu, Jul 31 - Tue, Aug 5
MCW
Mason City
STL
St. Louis
$328 Roundtrip, found 6 days ago
$328
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jul 31 from Mason City to St. Louis, returning Tue, Aug 5, priced at $328 found 6 days ago
United
Thu, Jul 31 - Mon, Aug 11
MCW
Mason City
STL
St. Louis
$331 Roundtrip, found 6 days ago
$331
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jul 31 from Mason City to St. Louis, returning Mon, Aug 11, priced at $331 found 6 days ago
United
Thu, Jul 31 - Sun, Aug 10
MCW
Mason City
STL
St. Louis
$358 Roundtrip, found 6 days ago
$358
Roundtrip
found 6 days ago
Select United flight, departing Thu, Jul 31 from Mason City to St. Louis, returning Sun, Aug 10, priced at $358 found 6 days ago
United
Wed, Jul 30 - Tue, Aug 5
MCW
Mason City
STL
St. Louis
$382 Roundtrip, found 6 days ago
$382
Roundtrip
found 6 days ago
Select United flight, departing Wed, Jul 30 from Mason City to St. Louis, returning Tue, Aug 5, priced at $382 found 6 days ago
United
Tue, Jul 29 - Fri, Aug 8
MCW
Mason City
STL
St. Louis
$411 Roundtrip, found 6 days ago
$411
Roundtrip
found 6 days ago
Select United flight, departing Tue, Jul 29 from Mason City to St. Louis, returning Fri, Aug 8, priced at $411 found 6 days ago
United
Wed, Jul 30 - Sun, Aug 10
MCW
Mason City
STL
St. Louis
$412 Roundtrip, found 6 days ago
$412
Roundtrip
found 6 days ago
Select United flight, departing Wed, Jul 30 from Mason City to St. Louis, returning Sun, Aug 10, priced at $412 found 6 days ago
United
Sat, Jul 26 - Thu, Aug 7
MCW
Mason City
STL
St. Louis
$415 Roundtrip, found 6 days ago
$415
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jul 26 from Mason City to St. Louis, returning Thu, Aug 7, priced at $415 found 6 days ago
United
Sat, Jul 26 - Tue, Aug 5
MCW
Mason City
STL
St. Louis
$429 Roundtrip, found 6 days ago
$429
Roundtrip
found 6 days ago
Select United flight, departing Sat, Jul 26 from Mason City to St. Louis, returning Tue, Aug 5, priced at $429 found 6 days ago
United
Sun, Jul 27 - Fri, Aug 8
MCW
Mason City
STL
St. Louis
$431 Roundtrip, found 6 days ago
$431
Roundtrip
found 6 days ago
Select United flight, departing Sun, Jul 27 from Mason City to St. Louis, returning Fri, Aug 8, priced at $431 found 6 days ago
Flights from Mason City (MCW) to St. Louis (STL)
Origin airport
Mason City Municipal
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$273
Distance
341 mi

Mason City to St. Louis Flights

The cheapest times to fly from Mason City to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Mason City to St. Louis are during the month of July. You can find some of the cheapest flights from Mason City to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Mason City to St. Louis

Sunday is one of the best days to book for cheap flights from Mason City to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Mason City to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Mason City to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $139 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Mason City to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Mason City to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Mason City Municipal Airport (MCW) to Lambert-St. Louis Intl. Airport (STL) cost?
Discover the latest flight deals from MCW to STL by entering your preferred travel dates and searching on Expedia. Easily compare prices by departure date if you have flexibility with your schedule and use handy filters to explore prices for your preferred journey. As a member of One Key™, our free loyalty program, you can use Price Tracking to watch fares and receive notifications if prices go up or down.
What is the cheapest month to fly from MCW to STL?
The cheapest flights from MCW to STL are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
What is the cheapest airline that flies from MCW to STL?
Use the filter tool on Expedia to compare airlines and find the cheapest carrier that'll take you from MCW to STL. Sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Mason City Municipal Airport (MCW) to Lambert-St. Louis Intl. Airport (STL)?
Direct flights from Mason City Municipal Airport (MCW) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with our filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from MCW to STL?
You'll usually find Tuesday the quietest day for flights, while Fridays are often the busiest.* However this can vary from season to season and during public holidays or peak travel times.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Mason City Municipal Airport (MCW) to Lambert-St. Louis Intl. Airport (STL)?
To reach Lambert-St. Louis Intl. Airport (STL) on time, book a flight that leaves from Mason City Municipal Airport (MCW) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Mason City Municipal Airport (MCW) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from MCW to STL right before your journey is typically more expensive. However, if there's some wiggle room with your travel times and dates, you could grab a cheap last-minute fare.
Is it cheaper to book a MCW to STL flight and hotel package?
Compared with arranging flights and hotels separately, booking a MCW to STL flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one easy place will take the stress out of travel planning. Just pick your flights and select from our extensive range of stays, then tailor your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Mason City Municipal Airport (MCW) to Lambert-St. Louis Intl. Airport (STL)?
In most cases, you can cancel or modify your MCW to STL flight. However, there may be additional charges, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and policies on flight changes, or if you need further details, visit our Customer Service portal.

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*Available to One Key members.