In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

What is the cheapest time of day to fly from ALO to STL?

When flying from Waterloo, Iowa to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

$229+ Flights from Waterloo, IA to St. Louis

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Cheap flight deals from Waterloo to St. Louis

Round-trip from	$229 (American Airlines)

From Waterloo to Lambert-St Louis

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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 agosto 14, 2025.

jue. 8/283:14 pmALO - STL

1 stop5h 04mAmerican Airlines

lun. 9/18:50 amSTL - ALO

1 stop5h 54mAmerican Airlines

Deal found 8/13

$229

Best flights from Waterloo to St. Louis
Discover carefully curated flight deals from Waterloo to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated agosto 14, 2025.

jue. 8/283:14 pmALO - STL

1 stop5h 04mAmerican Airlines

lun. 9/18:50 amSTL - ALO

1 stop5h 54mAmerican Airlines

Deal found 8/13

$229

Last-minute flights from Waterloo to St. Louis
Discover last-minute flight deals from Waterloo to St. Louis. Data last updated agosto 14, 2025 and is based on user searches.

jue. 8/283:14 pmALO - STL

1 stop5h 04mAmerican Airlines

lun. 9/18:50 amSTL - ALO

1 stop5h 54mAmerican Airlines

Deal found 8/13

$229

Fly from

Fly to

Route

Depart

Return

Price

WaterlooSt. Louis

ALO - STL

ALOSTL

Waterloo

jue. 8/28

3:14 pm-8:18 pm

1 stop5h 04m

Lambert-St Louis

lun. 9/1

8:50 am-2:44 pm

1 stop5h 54m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

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.

Cheapflights Insights

Everything you need to know about your flight from Waterloo to St. Louis

What is the cheapest month to book a flight from Waterloo, Iowa to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Waterloo, Iowa to St. Louis (average of $311). Flying from Waterloo, Iowa to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

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.
What is the cheapest month to book a flight from Waterloo, Iowa to St. Louis?
Currently, August is the cheapest month in which you can book a flight from Waterloo, Iowa to St. Louis (average of $311). Flying from Waterloo, Iowa to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$229+ 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 8/28. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Waterloo to St. Louis

Round-trip from

Find flight deals from Waterloo to St. Louis

Cheapest flights from Waterloo to St. LouisExplore 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 agosto 14, 2025.

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 agosto 14, 2025.

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Use the filters below to find and compare flights from Waterloo to St. Louis that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Waterloo to St. Louis

What is the cheapest month to book a flight from Waterloo, Iowa to St. Louis?

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.

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

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

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

What is the cheapest month to book a flight from Waterloo, Iowa to St. Louis?

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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 agosto 14, 2025.