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Cheap flights from St. Louis to Watertown from $314

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Watertown departing on 9/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

American Airlines Logo
6:10 am - 4:02 pmSTL-ART
8h 52m2 stops
American Airlines Logo
6:00 am - 12:23 pmART-STL
7h 23m1 stop
$314American Airlines
Find Deal
Sat, Sep 27 - Wed, Oct 1
American Airlines Logo
6:10 am - 4:02 pmSTL-ART
8h 52m2 stops
American Airlines Logo
6:00 am - 3:37 pmART-STL
10h 37m2 stops
$319American Airlines
Find Deal
Sat, Sep 27 - Wed, Oct 1
American Airlines Logo
1:03 pm - 8:29 pmSTL-ART
6h 26m1 stop
American Airlines Logo
4:27 pm - 9:06 pmART-STL
5h 39m1 stop
$480American Airlines
Find Deal
Sat, Sep 27 - Wed, Oct 1
American Airlines Logo
7:05 am - 6:33 pmSTL-ART
10h 28m2 stops
American Airlines Logo
6:00 am - 1:14 pmART-STL
8h 14m2 stops
$673American Airlines
Find Deal
Sat, Dec 27 - Wed, Dec 31
American Airlines Logo
7:05 am - 6:33 pmSTL-ART
10h 28m2 stops
American Airlines Logo
6:00 am - 12:32 pmART-STL
7h 32m1 stop
$708American Airlines
Find Deal
Sat, Dec 27 - Wed, Dec 31
American Airlines Logo
5:22 am - 11:04 pmSTL-ART
16h 42m1 stop
American Airlines Logo
6:58 pm - 12:32 pmART-STL
18h 34m1 stop
$822American Airlines
Find Deal
Sat, Dec 27 - Wed, Dec 31

American Airlines flights from St. Louis to Watertown, New York

Our best American Airlines deals on St. Louis to Watertown, New York flight tickets
American Airlines
Sep 27
STL6:10 amLambert-St Louis
8h 52m
2 stops
ART4:02 pmWatertown
Oct 1
ART6:00 amWatertown
7h 23m
1 stop
STL12:23 pmLambert-St Louis
$314
Find similar
American Airlines
Sep 27
STL6:10 amLambert-St Louis
8h 52m
2 stops
ART4:02 pmWatertown
Oct 1
ART6:00 amWatertown
10h 37m
2 stops
STL3:37 pmLambert-St Louis
$319
Find similar
American Airlines
Sep 27
STL1:03 pmLambert-St Louis
6h 26m
1 stop
ART8:29 pmWatertown
Oct 1
ART4:27 pmWatertown
5h 39m
1 stop
STL9:06 pmLambert-St Louis
$480
Find similar

momondo Fare Finder

 
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 28, 2025.
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

St. LouisWatertown

STL - ART

STLART

Lambert-St Louis

Sat 9/27

6:10 am-4:02 pm

2 stops8h 52m

Watertown

Wed 10/1

6:00 am-12:23 pm

1 stop7h 23m

$314

St. LouisWatertown

STL - ART

STLART

Lambert-St Louis

Sat 9/27

6:10 am-4:02 pm

2 stops8h 52m

Watertown

Wed 10/1

6:00 am-3:37 pm

2 stops10h 37m

$319

St. LouisWatertown

STL - ART

STLART

Lambert-St Louis

Sat 9/27

1:03 pm-8:29 pm

1 stop6h 26m

Watertown

Wed 10/1

4:27 pm-9:06 pm

1 stop5h 39m

$480

St. LouisWatertown

STL - ART

STLART

Lambert-St Louis

Sat 12/27

7:05 am-6:33 pm

2 stops10h 28m

Watertown

Wed 12/31

6:00 am-1:14 pm

2 stops8h 14m

$673

St. LouisWatertown

STL - ART

STLART

Lambert-St Louis

Sat 12/27

7:05 am-6:33 pm

2 stops10h 28m

Watertown

Wed 12/31

6:00 am-12:32 pm

1 stop7h 32m

$708

St. LouisWatertown

STL - ART

STLART

Lambert-St Louis

Sat 12/27

5:22 am-11:04 pm

1 stop16h 42m

Watertown

Wed 12/31

6:58 pm-12:32 pm

1 stop18h 34m

$822

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 is the cheapest day to depart on your flight to Watertown, New York?

The cheapest day to depart on your flight to Watertown, New York is on a Friday when prices can be found for as low as $336. This is often the case because there is less demand to fly during this day of the week. Flights from St. Louis to Watertown, New York on a Wednesday will generally be more expensive and average around $382. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Watertown, New York?

Flying to Watertown, New York from St. Louis in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $386 when looking at flights departing in the afternoon. Flights in the morning are often more expensive with an average ticket price of $408.

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

Direct flights

None
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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  • 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 6h 26m.

  • 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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