$200 Cheap Flights from Waterloo (ALO) to St. Louis (STL)

View $200 flight on Fri, Oct 24, 2025Opens in a new window

Popular airlines from Waterloo, IA (ALO-Waterloo Regional) to St. Louis Lambert Intl. Airport (STL)

  • Plan, book, fly with confidence

  • trending down icon

    Be in the know

    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • one key icon

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Waterloo to St. Louis (ALO-STL)

Prices were available within the past 7 days and start at $200 for one-way flights and $219 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Thu, Oct 23 - Sat, Oct 25
ALO
Waterloo
STL
St. Louis
$219 Roundtrip, found 14 hours ago
$219
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Thu, Oct 23 from Waterloo to St. Louis, returning Sat, Oct 25, priced at $219 found 14 hours ago
American Airlines
Fri, Oct 3 - Sun, Oct 5
ALO
Waterloo
STL
St. Louis
$239 Roundtrip, found 5 days ago
$239
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Oct 3 from Waterloo to St. Louis, returning Sun, Oct 5, priced at $239 found 5 days ago
American Airlines
Thu, Oct 23 - Sun, Oct 26
ALO
Waterloo
STL
St. Louis
$269 Roundtrip, found 14 hours ago
$269
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Thu, Oct 23 from Waterloo to St. Louis, returning Sun, Oct 26, priced at $269 found 14 hours ago
American Airlines
Thu, Oct 23 - Sat, Oct 25
ALO
Waterloo
STL
St. Louis
$279 Roundtrip, found 14 hours ago
$279
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Thu, Oct 23 from Waterloo to St. Louis, returning Sat, Oct 25, priced at $279 found 14 hours ago
American Airlines
Mon, Oct 6 - Sat, Oct 11
ALO
Waterloo
STL
St. Louis
$289 Roundtrip, found 5 days ago
$289
Roundtrip
found 5 days ago
Select American Airlines flight, departing Mon, Oct 6 from Waterloo to St. Louis, returning Sat, Oct 11, priced at $289 found 5 days ago
American Airlines
Thu, Oct 2 - Mon, Oct 6
ALO
Waterloo
STL
St. Louis
$294 Roundtrip, found 5 days ago
$294
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 2 from Waterloo to St. Louis, returning Mon, Oct 6, priced at $294 found 5 days ago
American Airlines
Fri, Oct 3 - Sun, Oct 5
ALO
Waterloo
STL
St. Louis
$299 Roundtrip, found 5 days ago
$299
Roundtrip
found 5 days ago
Select American Airlines flight, departing Fri, Oct 3 from Waterloo to St. Louis, returning Sun, Oct 5, priced at $299 found 5 days ago
American Airlines
Thu, Oct 23 - Sun, Oct 26
ALO
Waterloo
STL
St. Louis
$329 Roundtrip, found 14 hours ago
$329
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Thu, Oct 23 from Waterloo to St. Louis, returning Sun, Oct 26, priced at $329 found 14 hours ago
American Airlines
Thu, Oct 23 - Sat, Oct 25
ALO
Waterloo
STL
St. Louis
$332 Roundtrip, found 14 hours ago
$332
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Thu, Oct 23 from Waterloo to St. Louis, returning Sat, Oct 25, priced at $332 found 14 hours ago
American Airlines
Thu, Oct 2 - Fri, Oct 10
ALO
Waterloo
STL
St. Louis
$339 Roundtrip, found 5 days ago
$339
Roundtrip
found 5 days ago
Select American Airlines flight, departing Thu, Oct 2 from Waterloo to St. Louis, returning Fri, Oct 10, priced at $339 found 5 days ago

Frequently asked questions

How much does a flight from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $200 or cheap return flight from $219 from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL)?
Flying in October may help you find better deals, as it's the cheapest month for flights between ALO and STL. You'll often find the lowest fares during the off-season.
What is the cheapest airline that flies from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from ALO to STL. Then, sort your results by "Price (lowest to highest)" to snap up a good deal.
How many flights per day from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL)?
Nonstop flights from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll need to take a flight with a layover. Explore your options with Expedia's filters. Enter your travel details and pick either "1 Stop" or "2+ Stops."
What day of the week has the most flights from ALO to STL?
You'll typically find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can change from season to season and during peak travel times or public holidays.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL)?
To avoid possible delays on the Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL) route, travel before 3 PM. Later flights are 22% more likely to be canceled.**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 Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your plane ticket from ALO to STL right before your getaway is generally more expensive. But if there's some wiggle room with your travel times and dates, you could snag a cheap last-minute fare.
Is it cheaper to book an ALO to STL flight and hotel package?
You can save money by securing an ALO to STL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's simple to manage everything in one place. After selecting your preferred flights and accommodations, you can add extras like activities, car rentals and tours.
Can I cancel or change the date of my flight from Waterloo Regional Airport (ALO) to Lambert-St. Louis Intl. Airport (STL)?
You can usually cancel or reschedule your ALO to STL flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are allowed and if any costs are involved. You'll also find further details on our Customer Service portal.

Travel information

Travel information

Origin airport
Waterloo Regional
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines
Roundtrip price
$218
Distance
283 mi

Book with confidence

Book with confidence

Waterloo to St. Louis Flights

The cheapest times to fly from Waterloo 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 Waterloo to St. Louis are during the month of October. You can find some of the cheapest flights from Waterloo to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Waterloo to St. Louis

Sunday is one of the best days to book for cheap flights from Waterloo 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 Waterloo 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 Waterloo to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $200 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 Waterloo 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 Waterloo 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.

 

Waterloo to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.