$41 Find Cheap Flights to Waterloo - Compare and Save

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 8/6. 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

Save 20% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest round-trip
$122
Typical prices: $239-$469
Frontier
Thu 8/6Sun 8/9
BWI - STL • 1 stop
Cheapest non-stop
$140
Typical prices: $127-$319
Frontier
Thu 8/6Mon 8/10
DFW - STL • Non-stop
Arrival airport
You can't fly directly to Waterloo. It is served by St. Louis (STL), located 31.1 miles from Waterloo.
FAQs
FAQs
FAQs
FAQs
Top routes
Cheapest
Most popular
Insights
Insights
Insights
Insights
Start a new search
KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Waterloo!
Flight Deals
Useful Info
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

Thu, Aug 6 - Sun, Aug 9
Frontier Logo
8:35 am - 5:37 pm
BWI
-
STL
10h 02m
1 stop
Frontier Logo
6:34 pm - 7:26 am
STL
-
BWI
11h 52m
1 stop
$122Frontier
Fri, Aug 7 - Sun, Aug 9
Frontier Logo
9:32 pm - 8:57 am
BWI
-
STL
12h 25m
1 stop
Frontier Logo
6:34 pm - 7:26 am
STL
-
BWI
11h 52m
1 stop
$123Frontier
Wed, Aug 19 - Sat, Aug 22
Southwest Logo
7:00 am - 12:55 pm
DEN
-
STL
4h 55m
1 stop
Southwest Logo
5:20 pm - 6:35 pm
STL
-
DEN
2h 15mnonstop
$197Southwest
Sat, Aug 8 - Sat, Aug 15
United Airlines Logo
1:15 pm - 6:13 pm
IAD
-
STL
5h 58m
1 stop
United Airlines Logo
8:40 am - 11:54 am
STL
-
IAD
2h 14mnonstop
$267United Airlines
Mon, Aug 10 - Wed, Aug 12
Delta Logo
7:26 pm - 11:58 pm
IAD
-
STL
5h 32m
1 stop
Delta Logo
10:33 am - 4:38 pm
STL
-
IAD
5h 05m
1 stop
$271Delta
Tue, Aug 18 - Fri, Aug 21
United Airlines Logo
5:45 pm - 7:11 pm
IAD
-
STL
2h 26mnonstop
United Airlines Logo
8:50 am - 4:02 pm
STL
-
IAD
6h 12m
1 stop
$272United Airlines
Sat, Aug 15 - Wed, Aug 19
Delta Logo
8:28 am - 4:17 pm
IAD
-
STL
8h 49m
1 stop
Delta Logo
7:00 am - 2:05 pm
STL
-
IAD
6h 05m
1 stop
$276Delta
Tue, Aug 4 - Thu, Aug 6
American Airlines Logo
1:10 pm - 11:58 pm
LAX
-
STL
8h 48m
1 stop
American Airlines Logo
6:00 am - 8:10 am
STL
-
LAX
4h 10mnonstop
$318American Airlines
Sat, Aug 22 - Tue, Aug 25
American Airlines Logo
6:30 am - 5:37 pm
LAX
-
STL
9h 07m
1 stop
American Airlines Logo
6:00 am - 8:10 am
STL
-
LAX
4h 10mnonstop
$319American Airlines
Fri, Sep 4 - Mon, Sep 7
Southwest Logo
7:10 pm - 12:45 am
LAX
-
STL
3h 35mnonstop
Southwest Logo
6:25 am - 8:20 am
STL
-
LAX
3h 55mnonstop
$320Southwest
Useful Info

Good to know - Book Cheap Waterloo Plane Tickets

Low seasonJanuary
Cheapest flight$41
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 5% increase in price.
Flight from Dallas to St. Louis

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

Insights shared by verified travelers who flew to Waterloo 
DeidreFlew with Alaska Airlines
PDX
-
STL
Jun 2026
At PDX, the Alaska Airlines section is large and confusing, especially for older people needing assistance. So arrive at the airport quite early. The staff at the airport also need to remember that the newly remodeled space is unfamiliar to many passengers.
WaleFlew with United Airlines
IAH
-
STL
Dec 2025
Make sure your electronics are charged before boarding, the plane doesn’t have power outlets
Verified travelerFlew with Alaska Airlines
SEA
-
STL
Jul 2025
Give yourself extra time. Love the self check in options.
LarryFlew with Southwest
LAX
-
STL
Apr 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 Airlines
SEA
-
STL
Feb 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 New York4h 24m
    Flights from Denver1h 55m
    Flights from Boston2h 50m
    Flights from Atlanta1h 37m
    Flights from Los Angeles3h 25m
  • What is the cheapest flight to St. Louis?

    In the last 5 days, the cheapest flight deal to St. Louis was found on the route from Dallas, at $122 return. The most popular connection is from New York to St. Louis and KAYAK users have found round-trip deals for as low as $298 in the last 5 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 Fort Lauderdale $278, from Miami $321, from Los Angeles $341
  • 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 4249 reviews
8.0Comfort
7.5Entertainment
8.6Crew
7.0Food
8.1Boarding
Airline reviews

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

2.0 MediocreMatthew, Jun 2026
CVG - MDW
Read more Southwest reviews

Flight was delayed over 3 hours. Planes were dirty. Staff indifferent. And they serve vegan pretzels as snacks.

The flight was smooth. The Southwest experience has degraded overall, but this one was okay.

The checking experience in Orlando was terrible, almost missed the flight. Too many travelers and Southwest completely understaffed.

no service at all due to turbulence. they should've at least given us snacks, there were only 10 people on the entire flight.

For the first time in a long time, the Wi-Fi actually worked the entire flight! The flight crew was amazing as usual.

Great flight. I didn't get a drink because I was asleep whole on the flight.

Love them will get a Southwest card to track my points and keep flying with them. My family and I were pleased with the services.

WiFi was not working and didn’t have a beverage service

All good except once again bags took an hour at Midway Airport Happens all the time. Ridiculous

The seats were comfortable, and the boarding process was pretty smooth.

It was as good as it could be. Flying is not a pleasant experience these days.

There was an unruly family behind us that made the short flight miserable!!! The cabin crew did nothing to contain it.

Flight delay was frustrating, also you cannot checkin online without delta app, web browser check-in throw errors

Got on the plane and sat there for an hour before departure.

Very large passenger too space from my own seat. Arm board couldn’t be lowered because of his size. It wads very uncomfortable trip, as the flight was full couldn’t move anywhere having back pain because of the position in which I was the entire flight.

Cramped seating for me. Luckily it wasn’t a long flight

5 hour delay. They blamed the weather but it was the computer issues they had been dealing with for days.

I usually have a positive experience with Delta. Complimentary upgrades are always nice!

The captain was amazing and kept us informed throughout that there would be some rough air. The flight also got delayed but we were able to actually leave on time, which was great.

The staff did not do a good job of getting everyone boarded quickly, so we missed our take off window and had to sit on the tarmac for 20+ min waiting for our turn. The plan was old. Pockets on the back of seats were torn and tearing off. One of the attendants was rude-she would ask a question but he walking away before you finished answering so she kept getting our drink orders wrong.

The seats on this flight weren’t as comfortable as we had expected. Even leaned back these seats left us feeling crappy in our backs. Also we had to use our own tablets for movies, but nothing in the seats in front of us to hold the tablets up.

The head rest is too big and cannot be placed differently/removed. Causes one head to tilt forward and increase back pain

Horrible experience. They delayed our flight 7 hours!! We had to seat at the airport with kids on 4th July all day!

1 flight cancelled Had to fly out of different city Flight at new departure city was delayed 3 hours causing us to miss connecting flights. By the time we did make it to Prague our luggage did not. Had to wait day and a half for luggage to be delivered. Customer service was not good. Agents did not arrive at gate until 5-10 minutes before boarding

Awful. Delayed flights, missed connection to Toronto. Hotel vouchers were for already booked hotels x3. Giant waste of my time

Boarding was great, and the crew were very friendly. The seats must have been a bit on the older side and you could feel some of the seat components through the padding. Also, the plugs did not work on the row's entertainment screen or charging ports. Checked bag was transferred for connecting flight, and we appreciated how early we had the connecting gate information.

Very easy ! Use the kiosk and bag drop and right to security within 10 min

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

Boarded early, left early, arrived 40 mins early! A win win for me!

These airplanes should be illegal. The seats are two tight, it is a safety issue. Wheelchair support was ridiculously slow. We almost missed our flight.

I will never but. through kayak again. and American Airlines. I will never fly again on. They're both thieves.

Nothing, I wont be flying American Airlines again and will not be recommending anyone to fly American Airlines. It was the worst experience flying I've ever had.

My luggage was not sent with us. Not sure if this is Envoy Air responsibility but that was a very BAD experience

The planes can use an actual cleaning. The armrest and seats do not appear to be cleaned on this one and most other planes.

Flight was delayed…once landed at ORD, no gates were available so made us wait for 56 minutes after we landed to let us out of the aircraft!

The flight de-boarded after being informed of a 3 hour delay. The gate agent said we could go to lounge. The flight ended up boarding 20 minutes later and I missed it.

I love the e fact that the staff communicated swiftly when my flight was delayed and gate number changed

We had a mechanical delay which made us 90 minutes late (9:30 PM) then land and put into the penalty box because a plane was in our gate? What the hell! We should get priority.Damn American.

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

weather delay of almost 2 hours then we landed and our gate wasn't available so we waited another 30 min

Flight was scheduled at 9:40pm. Got delayed to 10 am, the next day. crazy

The bag check, flight check-in, and onboard experience convinced my wife and me that we will actively go out of our way to avoid flying Frontier Airlines in the future. At bag check, we were informed that check-in could only be completed via the Frontier mobile app. Unfortunately, the app was extremely frustrating—sending us through repetitive, confusing loops that repeatedly forced us to decline add-on services with nearly every click. While most airline apps upsell, this one felt intentionally exhausting. As the process dragged on, we became genuinely concerned that my phone battery would die before check-in could be completed. We approached the bag check staff—who were standing together talking—and explained both our frustration and our predicament. They laughed. Later, my wife described the interaction as “gaslighting,” which felt accurate. We were then informed it would cost $25 per person simply to have our boarding passes printed. From that point forward, the tone of the experience was consistently hostile. The bag check employees were condescending and combative, behaving more like bullies than customer service staff. Unfortunately, that same attitude continued onboard. One flight attendant argued with me when I attempted to stow my backpack in the overhead bin. I explained that we had each paid $75 to check our bags specifically so we would not need to use carry-on space and could have adequate legroom. She demanded to see my ticket, pointed out that it said “no carry-on”—which I acknowledged—and I reiterated that this was precisely why we paid to check our bags. Her response was, “I don’t make the rules.” She then walked away, but not before asking if I “truly wanted to fly back to Chicago today?”—an unnecessary and unmistakable threat. It is also worth noting that despite booking our tickets together in the same transaction, we were not seated together. Upon our return to Chicago—where we could once again sit together—we compared onboard experiences. We both remarked on how unhappy the flight attendants appeared and how each of us was separately asked whether we would like to purchase a beverage. We declined. At no point was water mentioned as an option, leaving us with the clear impression that even water came at a cost—or that complimentary water, if available at all, was deliberately left unmentioned. Overall, the experience was shocking and deeply disappointing, but it was also a profound learning experience—one we will not forget and will not repeat. -Steve

Good for a budget airline! It was easy to get on, staff was really nice. Can’t say anything about the food or entertainment because it wasn’t available, which is fine.

This company socks. It's fraud. They canceled our flight yesterday, and today we were late because of a really long line at the check in bag. At the rebook station, there was ton of people. The workers were all rude. I am gonna make a report to FTC.

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

Too many extra fees, uncomfortable, little leg room. Will not recommend this airline.

Severe turbulence. Captain never came on to reassure passengers after things settled down.

We were delayed three times ,and that destroyed my plans, and reservations

The crew was delayed because they came on another flight that was delayed due to weather 10pm flight left at 1.30 am The airline made no effort to align alternate crew

The flight itself was ok and the pilot was very communicative. However, our flight was delayed for almost 3 hours, the gate was changed 3 times and there was no communication as we were waiting. The flight staff was overall a little crabby...I understand as they probably had a long day but we all did.

Everything you need to know for your flight to Waterloo