$99 Cheap Flights from Watertown (ATY) to Denver (DEN)

View $99 flight on Sun, Jun 8, 2025Opens in a new window

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

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Find available prices by choosing your travel dates.

Cheap Flights from Watertown to Denver (ATY-DEN)

Prices were available within the past 7 days and start at $99 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

KEY LIME AIR DBA DENVER AIR CONNECTION
Fri, May 30 - Wed, Jun 4
ATY
Watertown
DEN
Denver
$198 Roundtrip, found 3 hours ago
$198
Roundtrip
found 3 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Fri, May 30 from Watertown to Denver, returning Wed, Jun 4, priced at $198 found 3 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Thu, Jun 19 - Sun, Jun 22
ATY
Watertown
DEN
Denver
$218 Roundtrip, found 7 hours ago
$218
Roundtrip
found 7 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Thu, Jun 19 from Watertown to Denver, returning Sun, Jun 22, priced at $218 found 7 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Thu, May 8 - Fri, May 9
ATY
Watertown
DEN
Denver
$238 Roundtrip, found 4 hours ago
$238
Roundtrip
found 4 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Thu, May 8 from Watertown to Denver, returning Fri, May 9, priced at $238 found 4 hours ago
United
Sat, Aug 9 - Wed, Aug 13
ATY
Watertown
DEN
Denver
$240 Roundtrip, found 6 days ago
$240
Roundtrip
found 6 days ago
Select United flight, departing Sat, Aug 9 from Watertown to Denver, returning Wed, Aug 13, priced at $240 found 6 days ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Tue, May 13 - Thu, May 22
ATY
Watertown
DEN
Denver
$258 Roundtrip, found 1 hour ago
$258
Roundtrip
found 1 hour ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Tue, May 13 from Watertown to Denver, returning Thu, May 22, priced at $258 found 1 hour ago
United
Sat, Aug 9 - Wed, Aug 13
ATY
Watertown
DEN
Denver
$270 Roundtrip, found 6 days ago
$270
Roundtrip
found 6 days ago
Select United flight, departing Sat, Aug 9 from Watertown to Denver, returning Wed, Aug 13, priced at $270 found 6 days ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Wed, May 14 - Sat, May 17
ATY
Watertown
DEN
Denver
$273 Roundtrip, found 3 days ago
$273
Roundtrip
found 3 days ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Wed, May 14 from Watertown to Denver, returning Sat, May 17, priced at $273 found 3 days ago
United
Tue, Sep 16 - Tue, Sep 23
ATY
Watertown
DEN
Denver
$277 Roundtrip, found 5 days ago
$277
Roundtrip
found 5 days ago
Select United flight, departing Tue, Sep 16 from Watertown to Denver, returning Tue, Sep 23, priced at $277 found 5 days ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Sat, May 3 - Sun, May 4
ATY
Watertown
DEN
Denver
$278 Roundtrip, found 9 hours ago
$278
Roundtrip
found 9 hours ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Sat, May 3 from Watertown to Denver, returning Sun, May 4, priced at $278 found 9 hours ago
KEY LIME AIR DBA DENVER AIR CONNECTION
Wed, Jul 16 - Fri, Jul 18
ATY
Watertown
DEN
Denver
$282 Roundtrip, found 3 days ago
$282
Roundtrip
found 3 days ago
Select KEY LIME AIR DBA DENVER AIR CONNECTION flight, departing Wed, Jul 16 from Watertown to Denver, returning Fri, Jul 18, priced at $282 found 3 days ago
Flights from Watertown (ATY) to Denver (DEN)
Origin airport
Watertown Regional
Destination airport
Denver Intl.
Airlines serving
KEY LIME AIR DBA DENVER AIR CONNECTION, United
Roundtrip price
$198
Distance
518 mi

Watertown to Denver Flights

The cheapest times to fly from Watertown to Denver

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 Watertown to Denver are during the month of May. You can find some of the cheapest flights from Watertown to Denver with Expedia's search tool and vast selection of airlines.

The best time to book a flight from Watertown to Denver

Sunday is one of the best days to book for cheap flights from Watertown to Denver: 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 Watertown to Denver

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 Watertown to Denver in 2025. You can also book with separate airlines for your outbound and return journeys, from $99 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 Watertown to Denver 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 Watertown to Denver 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 Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN) cost?
Score affordable return tickets from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN) starting at $198. Reserve your seat and take off on your trip. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Key Lime DBA Denver Air Connection flight leaving ATY on May 16 2025 and touching down at DEN. The price was last updated on April 24 2025 and has not changed since.
What is the cheapest month to fly from ATY to DEN?
The cheapest flights from ATY to DEN are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
You can travel nonstop from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN) on a Denver Air Connection flight.
What is the cheapest airline that flies from ATY to DEN?
With tickets starting at $99 for a one-way flight from ATY to DEN, Key Lime DBA Denver Air Connection is currently the cheapest carrier on this route. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from ATY on July 20 2025. Prices were last updated on April 24 2025 and have not changed since.
How many flights per day from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
On average, you can choose from 6 direct flights every week from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN). For more flexibility, consider taking a flight with a layover. Enter your dates on Expedia and then filter your search to include one or two stops.
What are the most popular departure times for flights from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
The 4 PM departures from ATY to DEN are the most sought after. Prices can be higher for these popular slots. If you want to save money, choose a less crowded time to fly.
What day of the week has the most flights from ATY to DEN?
If you travel on a Friday, you’ll get the greatest range of choices for flights from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN).
What is the earliest flight from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
The earliest flight out of Watertown Regional Airport (ATY) is at around 4:00PM UTC-6. Hop on this flight and you’ll land at Denver Intl. Airport (DEN) at approximately 4:40PM UTC-7. The total flight duration is 1h 40m.
How long does it take to fly from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
Flights from ATY to DEN have an average travel time of 1 hour and 40 minutes. The total distance between these two airports is 520 mi.
What airline has the least delays from ATY to DEN?
Consider traveling with Denver Air Connection if you’d like to go straight from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN) without any delays. This carrier has the best track record for punctuality, with an on-time score of 88%. Want real-time updates? You can check your flight status using the Expedia App.
What is the best time to fly from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
Book a flight from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN) 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 Denver from Watertown Regional Airport (ATY)?
Compare your flight options from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN). This is the only airport in Denver you can touch down at if you’re taking a direct flight.
Is it cheaper to buy a plane ticket from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN) last-minute?
Waiting until just before your trip to book a flight from ATY to DEN often results in higher prices. While you may find some last-minute discounts, they’re not always guaranteed. Keep your travel schedule open for the best chance of scoring a bargain.
Is it cheaper to book an ATY to DEN flight and hotel package?
Compared with arranging flights and hotels separately, booking an ATY to DEN flight and hotel package with Expedia could result in significant savings. Better yet, having everything in one place will take the hassle out of planning your trip. Simply secure your flights and select from our wide range of hotels, then tailor your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Watertown Regional Airport (ATY) to Denver Intl. Airport (DEN)?
Typically, you can reschedule or cancel your ATY to DEN flight. However, additional charges may apply, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline’s fees and rules on flight changes, or if you’d like further details, head to our Customer Service portal.

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