$24 Cheap Flights to Waterloo, IL

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Featured Airlines: American Airlines, United Airlines, Delta, Spirit, JetBlue, Frontier, Air India, Hawaiian Airlines and Qatar Airways

How much is the cheapest flight to Waterloo?

Prices were available within the past 7 days and start at $24 for one-way flights and $47 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Tue, Jun 4 - Tue, Jun 11
MCO
Orlando Intl.
STL
Lambert-St. Louis Intl.
$47 Roundtrip, found 11 hours ago
$47
Roundtrip
found 11 hours ago
Select Spirit Airlines flight, departing Tue, Jun 4 from Orlando Intl. to Lambert-St. Louis Intl., returning Tue, Jun 11, priced at $47 found 11 hours ago
Frontier Airlines
Wed, Aug 21 - Wed, Sep 4
DFW
Dallas-Fort Worth Intl.
STL
Lambert-St. Louis Intl.
$61 Roundtrip, found 4 days ago
$61
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Wed, Aug 21 from Dallas-Fort Worth Intl. to Lambert-St. Louis Intl., returning Wed, Sep 4, priced at $61 found 4 days ago
Frontier Airlines
Tue, Jul 2 - Tue, Jul 2
DEN
Denver Intl.
STL
Lambert-St. Louis Intl.
$83 Roundtrip, found 5 hours ago
$83
Roundtrip
found 5 hours ago
Select Frontier Airlines flight, departing Tue, Jul 2 from Denver Intl. to Lambert-St. Louis Intl., returning Tue, Jul 2, priced at $83 found 5 hours ago
Frontier Airlines
Fri, Jun 14 - Fri, Jun 14
PHX
Sky Harbor Intl.
STL
Lambert-St. Louis Intl.
$103 Roundtrip, found 5 days ago
$103
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Fri, Jun 14 from Sky Harbor Intl. to Lambert-St. Louis Intl., returning Fri, Jun 14, priced at $103 found 5 days ago
Spirit Airlines
Tue, Jun 11 - Tue, Jun 11
LGA
LaGuardia
STL
Lambert-St. Louis Intl.
$107 Roundtrip, found 12 hours ago
$107
Roundtrip
found 12 hours ago
Select Spirit Airlines flight, departing Tue, Jun 11 from LaGuardia to Lambert-St. Louis Intl., returning Tue, Jun 11, priced at $107 found 12 hours ago

Find Your Flights to Waterloo STL

Cheap flights to Waterloo (STL)

Get started finding a cheap flight to Waterloo on Expedia by either choosing a deal on this page or entering into the search bar your travel dates, origin airport, and whether you want roundtrip or one-way airfare. You can filter for flexibility, number of stops, airline, and departure/arrival times to find the best flight for you.

We recommend using the ‘Flexible Dates’ calendar at the top of the page to see the price of plane tickets on the surrounding dates. This allows you to pick the cheapest days to fly if your trip allows flexibility and score cheap flight deals to Waterloo.

Roundtrip prices range from $47 - $107, and one-ways to Waterloo start as low as $24.

Be aware that choosing a non-stop flight can sometimes be more expensive while saving you time. And routes with connections may be available at a cheaper rate.

Airlines that fly to Waterloo (STL)

You have several options for which airline you choose to travel with to Waterloo. There are 10 airlines flying into STL: Spirit Airlines, Frontier Airlines. 

Cheap plane tickets may be available from different airlines at different times and with unique terms. It’s best to understand the details of each airline’s offer before judging its value.

For example, if you plan to check a bag or bring a carry-on, check whether the cheap airfare deal includes a baggage allowance. If not, verify whether the baggage fee is higher than the difference of other airline plane ticket deals offering free checked/carry-on baggage in exchange for a slightly higher airfare. 

Additionally, your preferred frequent flyer membership programs may influence your choice of cheap airline. Expedia allows you to enter your membership numbers during checkout to earn points from your airline and Expedia Rewards—all while getting a great deal and planning all your travel in one online platform.

Find the best deals

At Expedia, we source many flight deals from multiple providers, so you can easily find the best deals that are right for you. A great strategy for getting the best deals can be to make sure you book and travel at the optimal times. Airfare to Waterloo (STL) varies throughout the year based on seasonal demand. You’ll see the lowest rates for roundtrips to STL in June and in August for one-ways.

Cancellation & flexibility

To change or cancel eligible flights, go to ‘My Trips’ and navigate to your itinerary. If you booked within the last 24-hours, you might be able to cancel your flight for free. Learn more about flight changes or cancellations from our customer service portal. Some plane tickets are available with no change fees, which you can filter for during your search.

Frequently asked questions

How do I find cheap flights to Waterloo that have flexible change policies?
By using our helpful “No change fee” filter, that’s how. Simply type in your origin, destination and travel dates, click “Search,” then tick the checkbox directly below the “Flexible change policies” subheading (top left-hand side of your screen). Expedia makes it a snap to find low-cost, flexible tickets to Waterloo.
What is the name of the airport in Waterloo?
Reserve a flight to Waterloo and you’ll land at Lambert-St. Louis Intl. Airport (STL).
How far is Lambert-St. Louis Intl. Airport (STL) from central Waterloo?
Lengthy commutes don’t have to be stressful if you consider your options ahead of time. Downtown Waterloo is 50 mi from Lambert Field, so it’s wise to know how to get to the city before you touchdown.
How can I book the cheapest flight to Waterloo?
If you’d love to have more spending money for your trip to Waterloo, it’s always better to book in advance. Prices are generally more expensive close to the departure date. Also find out if there is more than one airport at your destination. Airfares can differ based on which airport you land at. Don’t forget to compare prices across airlines and try to be flexible with your travel dates. Finally, be ready to act fast. If you spot an incredible deal, grab it before it disappears! Currently, one of the cheapest one-way tickets to Waterloo costs $21. This is for a flight that takes off from Las Vegas in June.
Which day of the week is the best day to buy a plane ticket to Waterloo?
Research suggests Sundays are the best day of the week for booking cheaper airfares. Your odds of picking up a fantastic deal to Waterloo also depend on how far in advance you book your flight. The cheapest tickets are typically found from 21 days to around 45 days out from the day of departure. You’re also likely to find bargains when tickets are released. Savings are subject to change and may vary depending on selections made.
What airport is best to fly into Waterloo?
A flight to Waterloo means coming in to land at Lambert Field. Jump off the plane, grab your baggage and you’ll be 50 mi from the center of town.
Which airlines fly to Waterloo?
You’ll find 9 airlines connecting Waterloo with 60 airports across the world. One of the best is American Airlines, which operates the biggest number of flights to Waterloo from Chicago. Another popular option is United Airlines.
How many nonstop flights are there to Waterloo?
Flying to a new place is much simpler when there aren’t any annoying stopovers. If you’re jetting off to Waterloo, the great news is that there are approximately 1,273 direct flights every week.
Where are the most popular flights to Waterloo departing from?
Flights to Waterloo departing from Chicago, Denver and Dallas airports are the most sought after.
Do you have any tips for my flight to Waterloo?

  • Get your vacation off to a promising start by being well prepared. Pack your passport or ID, travel documents and medications first. Next, think about downloading some new movies on your tablet or phone for a guiltless binge session. Or, toss in that novel you’ve been saving for a rainy day. Lastly, a snack to nibble on and a neck pillow will go a long way to making your flight as comfy as possible.
  • There’s a list of items you shouldn’t pack in your carry-on baggage too. Flammables, explosives and sharps are strictly prohibited in the cabin — they often include razor blades, box cutters, aerosol cans and flares. Some sporting equipment, like baseball bats and martial arts weapons, also generally can’t go in your hand luggage. Visit your airline’s website for details about what you can and can’t bring on board.

What to wear on a flight:

  • Choose comfort over fashion when flying. Layer up and wear natural fabrics as they allow air and moisture to pass through and keep you cool. Cabin temperatures can get cold on long-haul flights, so pack a pullover and always wear sneakers or enclosed shoes.
  • Reduce your risk of developing deep vein thrombosis (DVT), a blood clotting condition which can be caused by sitting for extended periods, by regularly moving around the cabin. Otherwise, do some gentle foot and leg exercises in your seat. If you’re at higher risk of developing DVT, consider wearing compression socks.

How can I get a cheap last-minute flight to Waterloo?
Securing a cheap, spur-of-the-moment flight to Waterloo is as easy as being flexible with your travel plans. Keep your options open when it comes to your flight times, travel dates and choice of carrier. If your destination has a few airports to choose from, compare the prices of flying into each of them for the best deal on your fare.
Where can I learn more about changing or canceling my flight to Waterloo?
Most flights are free to cancel within 24 hours of making the reservation. However, some flights are non-refundable, and you may receive a flight credit from the airline to use for a future booking. For more information, please visit our Customer Service Portal.
Flights to Waterloo information
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Destination city name
St. Louis
Roundtrip price
$46

Trending flights to Waterloo

Prices were available within the past 7 days and start at $24 for one-way flights and $47 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Spirit Airlines
Tue, Jun 4 - Tue, Jun 11
MCO
Orlando Intl.
STL
Lambert-St. Louis Intl.
$47 Roundtrip, found 11 hours ago
$47
Roundtrip
found 11 hours ago
Select Spirit Airlines flight, departing Tue, Jun 4 from Orlando Intl. to Lambert-St. Louis Intl., returning Tue, Jun 11, priced at $47 found 11 hours ago
*Available to One Key members.