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Cheap flights from St. Louis to Watertown from $551

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Watertown departing on 8/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Multiple Airlines Logo
STL  Lambert-St Louis-ART Watertown
825 mimulti-stop
Multiple Airlines Logo
ART  Watertown-STL Lambert-St Louis
825 mimulti-stop
Multiple Airlines

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Customize your flight search to find flights from St. Louis to Watertown, New York 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, momondo users made 832,500 searches. Data last updated August 14, 2026.
Use the filters below to find and compare flights from St. Louis to Watertown, New York that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest one-way
Quickest one-way

St. LouisWatertown

STL Lambert-St Louis - ART Watertown

STLART

Lambert-St Louis

Thu 8/27

10:44 am-10:55 pm

2 stops11h 11m

$551

St. LouisWatertown

STL Lambert-St Louis - ART Watertown

STLART

Lambert-St Louis

Thu 8/27

6:00 am-10:55 pm

1 stop15h 55m

$701

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from St. Louis to Watertown, New York

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What airlines fly to Watertown, New York?

American Airlines, Delta and United Airlines are the top three most popular airlines that fly to Watertown, New York from St. Louis according to our data. American Airlines is the first choice among our users, with 46% of people opting to fly with this airline when traveling to Watertown, New York. Keep in mind that there are 3 different airlines that fly to Watertown, New York on a routine basis, so you have a few additional options to choose from.

When to book flights from St. Louis to Watertown, New York

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Watertown, New York according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Watertown, New York (STL to ART) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Watertown, New York

Fastest flight time

8h 30m

Direct flights

None
The fastest flight from St. Louis to Watertown, New York takes 8h 30m
There are no direct flights from St. Louis to Watertown, New York. There are no popular flight routes from St. Louis to Watertown, New York.
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Frequently asked questions about flying from St. Louis to Watertown, New York

  • How far is Lambert-St Louis to Watertown by plane?

    Watertown is 826.4 mi away from Lambert-St Louis. A reasonable flight in good conditions will take 8h 30m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Watertown Airport?

    Prices for flights from Lambert-St Louis Airport to Watertown Airport refresh daily.

  • How old do you have to be to fly from Lambert-St Louis Airport to Watertown Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Watertown Airport.

  • What documentation or ID do you need to fly to Watertown Airport?

    The required travel and health documents for your Watertown Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Watertown Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Traveling to a place near Watertown?

Book flights to Watertown if you plan to visit one of these locations
Alexandria Bay
Clayton

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Watertown?

Finding the right flight to Watertown from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Watertown quick and easy, saving you time and money.

Can I find flights from St. Louis to Watertown with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Watertown from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Watertown?

momondo helps you find the best flight between St. Louis and Watertown by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from St. Louis to Watertown right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Watertown, momondo offers a useful price alert feature which will track prices for flights to Watertown from St. Louis and alert you when they change.

An easier way to manage your Watertown, New York trip

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