$230 Cheap Flights from St. Louis (STL) to Waterloo (ALO)

View $230 flight on Sat, Nov 22, 2025Opens in a new window

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

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

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

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

Prices were available within the past 7 days and start at $230 for one-way flights and $279 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Dec 30 - Tue, Jan 13
STL
St. Louis
ALO
Waterloo
$279 Roundtrip, found 22 hours ago
$279
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Tue, Dec 30 from St. Louis to Waterloo, returning Tue, Jan 13, priced at $279 found 22 hours ago
American Airlines
Sat, Nov 22 - Sat, Dec 13
STL
St. Louis
ALO
Waterloo
$284 Roundtrip, found 22 hours ago
$284
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Sat, Nov 22 from St. Louis to Waterloo, returning Sat, Dec 13, priced at $284 found 22 hours ago
American Airlines
Thu, Nov 20 - Sat, Dec 6
STL
St. Louis
ALO
Waterloo
$289 Roundtrip, found 22 hours ago
$289
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Thu, Nov 20 from St. Louis to Waterloo, returning Sat, Dec 6, priced at $289 found 22 hours ago
American Airlines
Thu, Nov 13 - Sun, Nov 23
STL
St. Louis
ALO
Waterloo
$299 Roundtrip, found 22 hours ago
$299
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Thu, Nov 13 from St. Louis to Waterloo, returning Sun, Nov 23, priced at $299 found 22 hours ago
American Airlines
Wed, Nov 19 - Sat, Dec 6
STL
St. Louis
ALO
Waterloo
$304 Roundtrip, found 22 hours ago
$304
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Wed, Nov 19 from St. Louis to Waterloo, returning Sat, Dec 6, priced at $304 found 22 hours ago
American Airlines
Sat, Nov 8 - Sun, Nov 23
STL
St. Louis
ALO
Waterloo
$314 Roundtrip, found 22 hours ago
$314
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Sat, Nov 8 from St. Louis to Waterloo, returning Sun, Nov 23, priced at $314 found 22 hours ago
American Airlines
Thu, Nov 6 - Tue, Nov 18
STL
St. Louis
ALO
Waterloo
$329 Roundtrip, found 22 hours ago
$329
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Thu, Nov 6 from St. Louis to Waterloo, returning Tue, Nov 18, priced at $329 found 22 hours ago
American Airlines
Sat, Dec 27 - Tue, Jan 13
STL
St. Louis
ALO
Waterloo
$339 Roundtrip, found 22 hours ago
$339
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Sat, Dec 27 from St. Louis to Waterloo, returning Tue, Jan 13, priced at $339 found 22 hours ago
American Airlines
Sun, Nov 2 - Tue, Nov 18
STL
St. Louis
ALO
Waterloo
$339 Roundtrip, found 22 hours ago
$339
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Sun, Nov 2 from St. Louis to Waterloo, returning Tue, Nov 18, priced at $339 found 22 hours ago
American Airlines
Tue, Nov 25 - Sat, Dec 13
STL
St. Louis
ALO
Waterloo
$344 Roundtrip, found 22 hours ago
$344
Roundtrip
found 22 hours ago
Select American Airlines flight, departing Tue, Nov 25 from St. Louis to Waterloo, returning Sat, Dec 13, priced at $344 found 22 hours ago

Alternative airports near Waterloo

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Waterloo Regional ALO. Cheapest and Closest option available. Average driving time to city center is 7 minutes. Flights from $299
ALO
Waterloo Regional
CheapestClosest
Average driving time to city center7 min
Flights from $299

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO) cost?
Lock in a cheap one-way flight from $230 or cheap return flight from $279 from Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO) 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 Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO)?
December is the cheapest month to fly from STL to ALO. Planning your trip for the off-season is often the key to finding better fares.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO)?
Expedia's filter tool lets you easily compare different airlines, departure times and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest STL to ALO flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO)?
There aren't any daily nonstop flights departing from Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO). But you can opt for flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from STL to ALO?
You'll generally find Tuesday the quietest day for flights, while Fridays tend to be the busiest.* However this can vary 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 Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO)?
To touch down at Waterloo Regional Airport (ALO) without delays, opt for a flight that takes off from Lambert-St. Louis Intl. Airport (STL) 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 Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO) last-minute?
Last-minute bookings from STL to ALO are usually more expensive. For the lowest rates, start looking for flights ahead of time. That said, if you can play around with your travel dates, it's possible to find a cheap ticket right before your trip.
Is it cheaper to book a STL to ALO flight and hotel package?
Opting for a STL to ALO flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our wide range of stays and then add activities, car rentals and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Waterloo Regional Airport (ALO)?
Typically, you can reschedule or cancel your STL to ALO flight. However, there may be additional fees, especially if you booked over 24 hours ago. Check your itinerary for the airline's guidelines and fees on flight changes, or if you'd like further details, head to our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Waterloo Regional
Airlines serving
American Airlines
Roundtrip price
$278
Distance
283 mi

Book with confidence

St. Louis to Waterloo Flights

The cheapest times to fly from St. Louis to Waterloo

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

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Waterloo: 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 St. Louis to Waterloo

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 St. Louis to Waterloo in 2025. You can also book with separate airlines for your outbound and return journeys, from $230 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 St. Louis to Waterloo 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 St. Louis to Waterloo 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.

 

St. Louis to Waterloo Flights

Explore a world of travel with Expedia

*Available to One Key members.