$38 Find Cheap Flights to Waterloo

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Waterloo departing on 12/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$97
Overall average: $161
Frontier
Mon 1/5Wed 1/7
DEN - STL • 1 stop
Cheapest non-stop
$107
Typical prices: $150-$330
Frontier
Sat 11/29Sat 12/6
DEN - STL • Non-stop
Top routes
ATL-STL
Cheapest
LGA-STL
Most popular
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Flight Deals
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Flight Deals

Cheap Flights to Waterloo

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights to Waterloo that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals to Waterloo

Mon, Jan 5 - Wed, Jan 7
Frontier Logo
11:59 pm - 10:33 pmDEN-STL
21h 34m1 stop
Frontier Logo
7:43 pm - 9:15 pmSTL-DEN
2h 32mnonstop
$97Frontier
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Sat, Jan 24 - Sat, Jan 31
Frontier Logo
12:59 am - 9:47 amDEN-STL
7h 48m1 stop
Frontier Logo
7:43 pm - 9:15 pmSTL-DEN
2h 32mnonstop
$98Frontier
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Wed, Dec 3 - Wed, Dec 17
Southwest Logo
6:05 am - 7:30 amICT-STL
1h 25mnonstop
Southwest Logo
10:25 am - 11:55 amSTL-ICT
1h 30mnonstop
$117Southwest
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Tue, Dec 9 - Thu, Dec 11
Southwest Logo
6:05 am - 7:30 amICT-STL
1h 25mnonstop
Southwest Logo
10:25 am - 11:55 amSTL-ICT
1h 30mnonstop
$144Southwest
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Wed, Dec 3 - Wed, Dec 17
Delta Logo
5:19 pm - 9:57 pmICT-STL
4h 38m1 stop
Delta Logo
12:49 pm - 8:08 pmSTL-ICT
7h 19m1 stop
$157Delta
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Tue, Dec 9 - Thu, Dec 11
Delta Logo
7:38 am - 12:04 pmICT-STL
4h 26m1 stop
Delta Logo
6:00 am - 11:03 amSTL-ICT
5h 03m1 stop
$169Delta
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Tue, Dec 2 - Tue, Dec 9
American Airlines Logo
7:37 pm - 11:56 pmBWI-STL
5h 19m1 stop
American Airlines Logo
6:52 am - 1:48 pmSTL-BWI
5h 56m1 stop
$179American Airlines
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Sat, Dec 6 - Mon, Dec 8
American Airlines Logo
7:15 am - 12:41 pmICT-STL
5h 26m1 stop
American Airlines Logo
11:35 am - 5:59 pmSTL-ICT
6h 24m1 stop
$180American Airlines
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Wed, Jan 14 - Mon, Jan 19
United Airlines Logo
3:00 pm - 10:00 pmICT-STL
7h 00m1 stop
United Airlines Logo
2:45 pm - 8:29 pmSTL-ICT
5h 44m1 stop
$191United Airlines
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Tue, Feb 3 - Sun, Feb 8
United Airlines Logo
9:57 pm - 11:59 pmEWR-STL
3h 02mnonstop
United Airlines Logo
7:00 am - 10:37 amSTL-EWR
2h 37mnonstop
$267United Airlines
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Good to know - Book Cheap Waterloo Plane Tickets

Low seasonJanuary
Cheapest flight$38
Best time to beat the crowds with an average 7% drop in price.
Most popular time to fly with an average 1% increase in price.
Flight from Atlanta to St. Louis

Flights to Waterloo: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew to Waterloo 
Verified travelerFlew with Alaska AirlinesSEA-STLJul 2025
Give yourself extra time. Love the self check in options.
LarryFlew with SouthwestLAX-STLApr 2024
For long flights on airlines built for short flights (SWA) anyone over 5’ 10” is going to get cramped. Consider an Economy Plus upgrade when available.
Verified travelerFlew with Alaska AirlinesSEA-STLFeb 2024
Be sure to measure your wheels for carry on my luggage was the correct size but the wheels made it over so had to check my bag wasn't happy about that since you have to pay for checked should at least get one free.

FAQs - booking Waterloo flights

  • How long is the flight to Waterloo?

    Flights from Washington, D.C.2h 20m
    Flights from New York2h 40m
    Flights from Denver2h 20m
    Flights from Boston2h 59m
    Flights from Atlanta1h 44m
  • What is the cheapest flight to St. Louis?

    In the last 3 days, the cheapest flight deal to St. Louis was found on the route from Atlanta, at $97 return. The most popular connection is from New York to St. Louis and KAYAK users have found round-trip deals for as low as $255 in the last 3 days.

  • Which airlines fly to St. Louis?

    Many airlines fly to St. Louis, the most common ones being Southwest, American Airlines, and United Airlines. See the amount of flights per week for popular airlines flying to St. Louis.

  • How to fly to Waterloo?

    You cannot fly directly to Waterloo. KAYAK recommends you fly to Lambert-St Louis (STL) (31.07 miles from Waterloo). From there you can rent a car or get a taxi.

  • What airports are near Waterloo?

    The closest airport is Lambert-St Louis (STL) (31.07 mi). Other nearby airports are Marion Williamson County (MWA) (73.86 mi) or Cape Girardeau (CGI) (82.94 mi). KAYAK recommends you fly to Lambert-St Louis.

  • How far is Lambert-St Louis Airport from central St. Louis?

    The city center of St. Louis is 13 miles from Lambert-St Louis Airport.

  • What is the name of St. Louis’s airport?

    There is only 1 airport in St. Louis, called Lambert-St Louis Airport (STL). It can also be referred to as Lambert Field, Lambert-St Louis, St. Louis Lambert, or St. Louis Lambert Intl.

  • How does KAYAK find such low prices on flights to Waterloo?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights to Waterloo.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket to Waterloo?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Waterloo is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights to Waterloo?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Waterloo with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight to Waterloo?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Waterloo up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Waterloo

  • There is no major airport in Waterloo. It is instead served by Lambert-St Louis Airport.
  • Looking for cheap airfare to Waterloo? 25% of our users found round-trip tickets to Waterloo for the following prices or less: From Miami $197, from Boston $277, from Los Angeles $428
  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Waterloo flight deals.

Reviews of the top 5 airlines flying to Waterloo

 
Need help choosing which airline to fly with from the United States to Waterloo? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
SouthwestOverall score based on 4239 reviews
7.0Food
8.0Comfort
8.1Boarding
8.6Crew
7.5Entertainment
Airline reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

8.0 ExcellentGreg, Oct 2025OAK - BUR
Read more Southwest reviews

Ever since Southwest starting charging for bags, passengers don't want to pay to check their bags, so the gate agents have to beg people to check their roller bags now because there's "not enough space". This was a terrible business move by Southwest.

Full cans of soda would be nice. A choice between two snacks would be appreciated.

Tried watching free movie and it kept freezing so I couldn’t finish.

All was good. I just had a hard time getting connected to the WiFi/internet during the flight

Sacrament staff are always polite and helpful. Airport is easy to maneuver and boarding is straightforward.

Great flight. Outstanding Service. Southwest was able to put us on a direct flight to Denver when the connection could have been affected by a later arrival to Baltimore. The direct flight was less expensive that the flight with the connection in Baltimore.

Delays delays delays. Late taking off, late landing, wait for a gate, etc.

Boarded on time but once we were ready for take off, the crew determined that, although every seat was taken, somehow someone was on the wrong flight. Delay, delay delay, announcements and ended up with one person checking EVERY ID against their passenger Manifest only to figure out it was a "clerical error." We departed 54 minutes late causing me to run in the St. Louis Airport to make my connection and lose the priority boarding spot I had paid for. Unnecessary delay.

I was re-booked onto another flight because my original flight was delayed and I would have missed my connector. I ended up in the “C” group after paying extra to be in the “A “ group on the original flight. At least if you’re going to re-book people, re-book them into the same group.

Flight was delayed due to plane not passing inspection And one of the crew had to time out and we had to wait for another one A 3 hour delay

I truly love flying with Delta. They have always treated me with the upmost respect

Our flight attendant in FIRST CLASS was one of the worst I’ve ever had. She was not at all pleasant, nor particularly good at her service.

Everything went well and was good. Nothing exceptional, but no complaints either. Cheap seats are pretty comfortable.

Staff were friendly and happy. Delta could make sure passengers that don't have the app know of changes. Without Kayak I would not have known about the change of gate or the delay. Kayak was faster to notify me.

They ended up paying for the bag twice, but the counter wouldn't take my baggage receipt. Left it to me to resolve. Not sure how to resolve the issue.

The customer service before board was very rude and when I expressed my concerns about making the connecting flight she laughed and told me I bought the wrong ticket. I explained once it showed the flight was delayed it no longer let me change seats or anything. I was trying to upgrade to make sure I would get to the next gate on time.

Non stop on long haul is the way to go. Great experience

The flight used a B767 with a very old interior from before 2014. The entertainment system did not work at all during the flight despite attempts to reset the system. It was like they flew this route just to be competitive.

They changed planes and the new plane couldn’t carry enough fuel to fly across the country so we had to stop in Kansas City to refuel. Flight was delayed .

Flight was too crowded and seats are too small, especially since passengrs are getting larger. Having a middle seat is ALWAYS tough! Woman on my left was large & kept creeping in to my space. Flight personnel were great! Have more savory rather than sweet snacks please.

Flight was delayed only slightly before takeoff due to traffic control. However, the flight arrived early to ORD. Good flight. United has been very reliable for me.

Another delayed flight. When the delays exceed the duration of the flight, it’s a problem.

After boarding the plane in Chicago, the passengers were told that there was a technical problem with the plane. Passengers remained on the plane as they tried to fix the problem. After what was probably an hour passengers were told that there was a need to change planes as the problem was not solved. Passengers disembarked and boarded another plane. After taxing to the runway and waiting for takeoff, passengers were told that owing to the thunderstorm the flight was unable to take off but would try and reroute. After some time passengers were told there wasn't enough fuel for the new route and the plane had to return to the gate for additional fuel. after another log delay the flight got underway. On the plane there was food, drinks, ice or entertainment. We were a glass of water, which appeared rationed. Flight arrived about 5 hours late. The pilot was fantastic and communicated with the passengers throughout the ordeal.

Better WiFi. I cannot understand that in 2025, United is so behind on a technology that is now a necessity and still painfully unreliable, slow and keeps disconnecting.

Trip was great. A wild landing in Ottawa with the wind and rain, but the pilot did a great job. Always love flying United.👍

Excellent experience. Starting with the agent at the Premier bag drop who noticed I was very early for my scheduled flight and offered to rebook me on an earlier flight with my seat preference. She would not let me leave the counter until she knew that all of the changes and new boarding pass showed up on my United app. At the gate, the flight boarded quickly such that we departed early and the flight was smooth. We arrived 20 minutes early at ORD and I was able to be home in time for dinner. One of the best flights I've had.

Salina to travers city was great! But the sept 24 Tranverse city was not! Traverse city to chichago was cancelled, i went to Denver & got to Salina 6 hours later!

See previous note about the passenger in Denver who threw my husband's bag out of the overhead bin in order to maker room for his own. And the flight attendant back up the new passenger.

Flight attendant in first class gave poor service (like he didn't want to be there) and food was awful. We sat waiting for gate upon arrival over 45 mins.

Weather delay in Chicago?. No sense of urgency to make connection in Chicago for our connecting flight that wasn't delayed. Connection was missed.

I enjoyed the extra leg room compared to other airlines. The first stewards made my daughter’s birthday special by giving her an extra snack. Then the last one coming home from Chicago to Appleton made our night really enjoyable Thanks for making our trip enjoyable

It was good..clean, comfy seat. Friendly warm welcoming crew. Was able to check my cabin luggage at the gate which I was able to pickup in a decent time from baggage claim. The app gave all updates from delays to baggage claim info. Overall smooth flight.

It was a typical flight. We had a delay which seems to be the normality now. And we had no in flight service due to conditions.

After we landed we sat on the tarmac for 1.5 hours waiting to get to our gate. Ridiculous.

Terrible. Flight delayed for more than 8 hours with only a $12 meal voucher provided for the inconvenience. The airplane did not have breaks on arrival yet they still made us go through the motions and board on time knowing we could not take off then sit for 40+ minutes before having to get of the time. A complete waste of my time. I cannot believe they can stay business with these shenanigans. I’ll avoid this company like the plague moving forward as the lack of accountability is disgraceful.

This was the best 2 flights I have had with American out of SGF. Great crew both flights.

Excellent - explanations were clear staff was nice and flight was comfortable

Lost bag and 2 days no word leaving for cruise no clothes or stuff

Any flight to ORD after about 2pm this summer has been challenging. Flight was delayed getting in (coming from ORD) and that led to it not leaving before a ground stop due to lightening before they could fuel the plane, and so forth. They made up some time but we were still late in arriving at ORD, and that led to missed connections.

Food was ok, but not as good as I have had before on AA.

Terrible. Flight cancelled with no reasoning and no flights to rebook. Employees were useless and did nothing to help. Did not even know where to retrieve luggage from the cancelled flight. Flyers beware.

No fault of Frontier staff: plane was very late, reached Orlando at 1 am, took a while to get luggage. Weather, gov financial shutdown impact on TSA, air controllers seemed to have multiple flights backed up. Frontier staff seemed to cope as gracefully as possible. It did reassure me that I and my new hip could adapt to travel challenges. Food/entertainment were irrelevant to my trip.

Terrible. The canceled my entire flight when I requested a refund for a trip frontier canceled trip one way.

Boarding was on time and plane departed as scheduled. There are obviously no amenities (food, drink, entertainment) on Frontier, but there also didn't seem to be any issues with luggage space either.

Inbound plane was on time and flight departed on time with no issues while boarding.

I knew going into this that Frontier, being a low cost carrier, would be pretty bare bones and charge for most extras but this was made up for by the fact that the airplane was a reasonably new Airbus, every employee was great and best of all, Everett Washington is an amazing airport - thanks Frontier for flying there!!!

i was unable to check in the flight. refund requested

It was well done. It was my first time flying with them and I was nervous b/c I have heard of many cancelled and/or delray flights. Everything went smoothly.

Just know that everything, and I mean everything is “ala cart”. 60$ just to put something in the overhead bin. I will never fly Frontier again nor do I recommend them to anyone else.

The single worst check in experience I could imagine. I’ll never do any business with Frontier or any affiliated company

Everything you need to know for your flight to Waterloo

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