$197 Cheap Flights from Denver (DEN) to Watertown (ATY)

View $197 flight on Mon, Nov 10, 2025Opens in a new window

Popular airlines from Denver Intl. Airport (DEN) to Watertown, SD (ATY-Watertown Regional)

Cheap Flights from Denver to Watertown (DEN-ATY)

Prices were available within the past 7 days and start at $197 for one-way flights and $240 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

United
Fri, Oct 3 - Sun, Oct 5
DEN
Denver
ATY
Watertown
$240 Roundtrip, just found
$240
Roundtrip
just found
Select United flight, departing Fri, Oct 3 from Denver to Watertown, returning Sun, Oct 5, priced at $240 just found
Delta
Fri, May 1 - Thu, May 7
DEN
Denver
ATY
Watertown
$260 Roundtrip, found 23 hours ago
$260
Roundtrip
found 23 hours ago
Select Delta flight, departing Fri, May 1 from Denver to Watertown, returning Thu, May 7, priced at $260 found 23 hours ago
United
Fri, Oct 3 - Sun, Oct 5
DEN
Denver
ATY
Watertown
$270 Roundtrip, just found
$270
Roundtrip
just found
Select United flight, departing Fri, Oct 3 from Denver to Watertown, returning Sun, Oct 5, priced at $270 just found
Delta
Fri, May 1 - Thu, May 7
DEN
Denver
ATY
Watertown
$292 Roundtrip, found 23 hours ago
$292
Roundtrip
found 23 hours ago
Select Delta flight, departing Fri, May 1 from Denver to Watertown, returning Thu, May 7, priced at $292 found 23 hours ago
Delta
Sat, Sep 27 - Sat, Oct 4
DEN
Denver
ATY
Watertown
$322 Roundtrip, found 1 day ago
$322
Roundtrip
found 1 day ago
Select Delta flight, departing Sat, Sep 27 from Denver to Watertown, returning Sat, Oct 4, priced at $322 found 1 day ago
Delta
Fri, May 1 - Thu, May 7
DEN
Denver
ATY
Watertown
$330 Roundtrip, found 23 hours ago
$330
Roundtrip
found 23 hours ago
Select Delta flight, departing Fri, May 1 from Denver to Watertown, returning Thu, May 7, priced at $330 found 23 hours ago
United
Thu, Sep 18 - Sun, Sep 21
DEN
Denver
ATY
Watertown
$340 Roundtrip, found 1 day ago
$340
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 18 from Denver to Watertown, returning Sun, Sep 21, priced at $340 found 1 day ago
Delta
Wed, Dec 31 - Sun, Jan 4
DEN
Denver
ATY
Watertown
$354 Roundtrip, found 4 days ago
$354
Roundtrip
found 4 days ago
Select Delta flight, departing Wed, Dec 31 from Denver to Watertown, returning Sun, Jan 4, priced at $354 found 4 days ago
Delta
Fri, May 1 - Thu, May 7
DEN
Denver
ATY
Watertown
$362 Roundtrip, found 23 hours ago
$362
Roundtrip
found 23 hours ago
Select Delta flight, departing Fri, May 1 from Denver to Watertown, returning Thu, May 7, priced at $362 found 23 hours ago
Delta
Fri, Nov 14 - Sun, Nov 16
DEN
Denver
ATY
Watertown
$368 Roundtrip, found 1 day ago
$368
Roundtrip
found 1 day ago
Select Delta flight, departing Fri, Nov 14 from Denver to Watertown, returning Sun, Nov 16, priced at $368 found 1 day ago

Find the cheapest month to fly from Denver (DEN) to Watertown (ATY)

January is typically the cheapest month to fly

From $158 - $487 per traveler.

Alternative airports near Watertown

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Watertown Regional ATY. Cheapest and Closest option available. Average driving time to city center is 6 minutes. Flights from $610
ATY
Watertown Regional
CheapestClosest
Average driving time to city center6 min
Flights from $610
Flights from Denver (DEN) to Watertown (ATY)
Origin airport
Denver Intl.
Destination airport
Watertown Regional
Airlines serving
Delta, United
Roundtrip price
$240
Distance
518 mi
Average flight time
1 hour 44 mins

Denver to Watertown Flights

The cheapest times to fly from Denver to Watertown

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Denver to Watertown are during the month of October. You can find some of the cheapest flights from Denver to Watertown with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Denver to Watertown

Sunday is one of the best days to book for cheap flights from Denver to Watertown: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Denver to Watertown

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Denver to Watertown in 2025. You can also book with separate airlines for your outbound and return journeys, from $197 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Denver to Watertown flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Denver to Watertown airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY) cost?
Get a cheap one-way flight from $197 or cheap return flight from $240 from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
The cheapest month to fly from DEN to ATY is October, when there's less demand. Off-peak months are usually when you'll find lower airfares between these airports.
Which airlines fly direct from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
Fly nonstop from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY) on a Denver Air Connection flight.
What is the cheapest airline that flies from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
To find the cheapest airline flying from DEN to ATY, use Expedia's filter tool. Customize your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to discover the cheapest flight right away.
How many flights per day from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
On average, Denver Intl. Airport (DEN) has 6 direct flights to Watertown Regional Airport (ATY) each week. If you want more options, use Expedia's filters to search for flights with one or two stops. Squeeze in a visit to another city or simply break up your trip.
What are the most popular departure times for flights from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
Flights between DEN and ATY are their busiest at 4 PM. If you'd like a more relaxed trip and possibly cheaper fares, choose a time when demand is lower.
What day of the week has the most flights from DEN to ATY?
Sunday offers the most flights from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY). Consider leaving on this day and you'll have the best chance of finding a departure that fits your schedule.
What is the earliest flight from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
Denver Intl. Airport (DEN)'s first flight to Watertown Regional Airport (ATY) leaves at approximately 4:55PM UTC-7. With a travel time of 1h 40m, you'll land at around 7:35PM UTC-6.
How long does it take to fly from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
Typically, it takes 1 hour and 40 minutes to cover the 520 mi from DEN to ATY.
What airline has the least delays from DEN to ATY?
Consider booking with Denver Air Connection if you'd like to go straight from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY) without any holdups. This carrier has the best track record for punctuality, with an on-time score of 100%. Want to be updated if anything changes? You can keep an eye on your flight status using the Expedia App.
What is the best time to fly from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
Choose a flight from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY) that takes off before 3 PM to reduce the risk of cancellations and delays. Departures after this time have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Watertown from Denver Intl. Airport (DEN)?
Compare your flight options from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY). This is the only airport in Watertown you can land at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY) last-minute?
Last-minute fares from DEN to ATY are typically more expensive. To secure the lowest prices, start searching for flights early. That said, if you're flexible with your travel plans, it's possible to find a cheap fare right before you leave.
Is it cheaper to book a DEN to ATY flight and hotel package?
You'll generally save money by booking a DEN to ATY flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage everything in one place. Once you've chosen your preferred accommodations and flights, you can add extras like tours, activities and car rentals.
Can I cancel or change the date of my flight from Denver Intl. Airport (DEN) to Watertown Regional Airport (ATY)?
In most cases, you can cancel or reschedule your DEN to ATY flight. However, additional charges may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's fees and rules on flight changes, or if you'd like further information, visit our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.