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$540+ Cheap flights from Waterloo, IA to St. Louis (ALO - STL)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ALO — STL
Jun 3 — Jun 101
Wed 6/3
Wed 6/10
1 adult, Economy
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Cheap flight deals from Waterloo to St. Louis

Cheapest flights from Waterloo to St. Louis
Explore the most affordable flight options available from Waterloo to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 4, 2026.

This American Airlines deal was found by Cheapflights users on 5/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/195:40 am
ALO
-
STL
1 stop6h 07m
American Airlines
Sat 5/238:02 pm
STL
-
ALO
1 stop4h 07m
American Airlines
Deal found 5/4$540
This American Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/185:40 am
ALO
-
STL
1 stop30h 07m
American Airlines
Fri 5/221:45 pm
STL
-
ALO
1 stop48h 47m
American Airlines
Deal found 5/3$631
This American Airlines deal was found by Cheapflights users on 5/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/42:23 pm
ALO
-
STL
1 stop5h 10m
American Airlines
Sun 5/105:21 pm
STL
-
ALO
1 stop6h 34m
American Airlines
Deal found 5/3$646

Find flight deals from Waterloo to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Waterloo (ALO) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated May 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$540
(American Airlines)
Provider with most accurate pricing for Waterloo-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Waterloo-Lambert-St Louis flights.
Search Deals
From Waterloo to Lambert-St Louis
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Waterloo 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, Cheapflights users made 2,558,603 searches. Data last updated May 4, 2026.
Use the filters below to find and compare flights from Waterloo 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 5/19

5:40 am-11:47 am

1 stop6h 07m

Lambert-St Louis

Sat 5/23

8:02 pm-12:09 am

1 stop4h 07m

$540

WaterlooSt. Louis

ALO - STL

ALOSTL

Waterloo

Mon 5/18

5:40 am-11:47 am

1 stop30h 07m

Lambert-St Louis

Fri 5/22

1:45 pm-2:32 pm

1 stop48h 47m

$631

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/4

Sorted by cheapest first

Compare providers for flights from Waterloo to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Waterloo to St. Louis in May.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Waterloo, Iowa-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Waterloo, Iowa-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Waterloo, Iowa-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Waterloo, Iowa-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Waterloo, Iowa-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Waterloo to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Waterloo with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Related info for your journey

Find useful and relevant information for your journey from Waterloo to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Waterloo, Iowa to St. Louis?

    A quick flight from Waterloo, Iowa to St. Louis can take about 6h 07m. American Airlines provides one of the quickest options available for as low as $540. The distance between Waterloo, Iowa and St. Louis is about 283 mi.

  • Can I find deals for flights from Waterloo to St. Louis that include hotel bookings?

    Yes. In addition to deals on Waterloo to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Waterloo to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Waterloo to St. Louis.

  • Can I find deals for business class flights from Waterloo to St. Louis?

    Yes. Cheapflights offers flight deals from Waterloo to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fenton
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Wentzville
Glencoe
Chesterfield
Alton
Farmington
Festus

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