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Cheap flights from Waterloo, Iowa to St. Louis from $545

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Waterloo, Iowa to St. Louis departing on 4/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Waterloo, Iowa to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
5:40 am - 11:47 am
ALO
-
STL
6h 07m
1 stop
American Airlines Logo
8:57 am - 1:53 pm
STL
-
ALO
4h 56m
1 stop
$545American Airlines
Tue, Apr 7 - Sat, Apr 11

momondo Fare Finder

 
Customize your flight search to find flights from Waterloo, Iowa to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated March 26, 2026.
Use the filters below to find and compare flights from Waterloo, Iowa to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

WaterlooSt. Louis

ALO - STL

ALOSTL

Waterloo

Tue 4/7

5:40 am-11:47 am

1 stop6h 07m

Lambert-St Louis

Sat 4/11

8:57 am-1:53 pm

1 stop4h 56m

$545

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from Waterloo, Iowa to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Waterloo, Iowa to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Waterloo, Iowa to St. Louis (ALO to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Waterloo, Iowa to St. Louis

Fastest flight time

6h 07m

Direct flights

None
The fastest flight from Waterloo, Iowa to St. Louis takes 6h 07m
There are no direct flights from Waterloo, Iowa to St. Louis. There are no popular flight routes from Waterloo, Iowa to St. Louis.
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  • How far is Waterloo to Lambert-St Louis by plane?

    The distance between Waterloo and Lambert-St Louis is about 289.6 mi. By plane, this route typically takes 6h 07m.

  • When did momondo last update prices for flights from Waterloo Airport to Lambert-St Louis Airport?

    Prices for flights from Waterloo Airport to Lambert-St Louis Airport were last updated today.

  • How old do you have to be to fly from Waterloo Airport 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 Waterloo Airport 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.

  • How do I get Price Alerts for flights from Waterloo, Iowa to St. Louis?

    Search flight deals from Waterloo, Iowa to St. Louis. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from Waterloo, Iowa to St. Louis with momondo?

    By using tools like our “Price Calendar”, you can see the best day to fly round-trip for your travels. Our “Price Forecast” tool uses AI to predict whether you should purchase or hold off on booking for potentially cheaper prices. Explore shows you all flight options from a city or airport to build your own unique adventure. The Discover blog also provides valuable insights for saving money while booking your experience. After searching you can toggle on “Price Alerts” to track prices for your desired flight and book at the ideal moment.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Florissant
Maryland Heights
O'Fallon
Collinsville
St. Peters
Wentzville
Alton
Fenton
Farmington
Clayton
Festus
Edwardsville
Eureka
Litchfield
Shrewsbury
Grafton

Why use momondo?

Why should I use momondo to find a flight deal from Waterloo to St. Louis?

Finding the right flight to St. Louis from Waterloo is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

Can I find flights from Waterloo to St. Louis with flexible booking policies on momondo?

momondo does allow users to show only those flights to St. Louis from Waterloo which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Waterloo 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 Waterloo to St. Louis.

I’m not ready to book a flight from Waterloo to St. Louis right now. Can momondo alert me if prices change?

Price alerts on flights to St. Louis from Waterloo are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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