$309+ Cheap flights from St. Louis to Waterloo, IA (STL - ALO)
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 11/14. Fares are subject to change and may not be available on all flights or dates of travel.
STL — ALO
Nov 15 — Nov 221
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from St. Louis to Waterloo with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Waterloo
Cheapest
Best
Last-minute
Cheapest flights from St. Louis to WaterlooExplore the most affordable flight options available from St. Louis to Waterloo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2026.
Explore the most affordable flight options available from St. Louis to Waterloo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 16, 2026.
This American Airlines deal was found by Cheapflights users on 10/14. 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.
Sat 11/1411:23 am -
1 stop12h 15m
Fri 11/205:56 am -
1 stop28h 48m
Deal found 10/14![American Airlines logo]()
$309
Best flights from St. Louis to WaterlooDiscover carefully curated flight deals from St. Louis to Waterloo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 16, 2026.
Discover carefully curated flight deals from St. Louis to Waterloo that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 16, 2026.
This American Airlines deal was found by Cheapflights users on 10/14. 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.
Sat 11/1411:23 am -
1 stop12h 15m
Fri 11/205:56 am -
1 stop28h 48m
Deal found 10/14![American Airlines logo]()
$309
Last-minute flights from St. Louis to WaterlooDiscover last-minute flight deals from St. Louis to Waterloo. Data last updated October 16, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Waterloo. Data last updated October 16, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 10/14. 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.
Sat 11/1411:23 am -
1 stop12h 15m
Fri 11/205:56 am -
1 stop28h 48m
Deal found 10/14![American Airlines logo]()
$309
Find flight deals from St. Louis to Waterloo
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Waterloo (ALO). 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 October 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $309 (American Airlines) |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Waterloo 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 7,457,451 searches. Data last updated October 16, 2026.
Use the filters below to find and compare flights from St. Louis to Waterloo that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
St. LouisWaterloo
STL Lambert-St Louis - ALO Waterloo
STLALO
Lambert-St Louis
Sat 11/14
11:23 am-11:38 pm
1 stop12h 15m
Waterloo
Fri 11/20
5:56 am-10:44 am
1 stop28h 48m
$309
Sorted by cheapest first
- Most accurate provider: When it comes to deals on St. Louis-Waterloo, Iowa flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Waterloo, Iowa flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Waterloo, Iowa flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Waterloo, Iowa 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 St. Louis-Waterloo, Iowa 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 St. Louis to Waterloo
Have a flexible travel schedule? Discover the best time to fly to Waterloo from St. Louis with our price prediction graph.
STL-ALO
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 St. Louis to Waterloo. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Waterloo?
Book flights to Waterloo if you plan to visit one of these locationsCedar Falls
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Other flights from St. Louis
Popular flights
Waterloo flight routes