$261 Cheap Flights from Philadelphia (PHL) to Watertown (ATY)

View $261 flight on Thu, Nov 20, 2025Opens in a new window

Popular airlines from Philadelphia Intl. Airport (PHL) to Watertown, SD (ATY-Watertown Regional)

Cheap Flights from Philadelphia to Watertown (PHL-ATY)

Prices were available within the past 7 days and start at $261 for one-way flights and $244 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, Nov 18 - Sun, Nov 23
PHL
Philadelphia
ATY
Watertown
$244 Roundtrip, found 6 days ago
$244
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Nov 18 from Philadelphia to Watertown, returning Sun, Nov 23, priced at $244 found 6 days ago
Delta
Thu, Nov 20 - Sun, Nov 23
PHL
Philadelphia
ATY
Watertown
$259 Roundtrip, found 6 days ago
$259
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Nov 20 from Philadelphia to Watertown, returning Sun, Nov 23, priced at $259 found 6 days ago
Delta
Thu, Nov 20 - Mon, Nov 24
PHL
Philadelphia
ATY
Watertown
$309 Roundtrip, found 6 days ago
$309
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Nov 20 from Philadelphia to Watertown, returning Mon, Nov 24, priced at $309 found 6 days ago
Delta
Sat, Nov 8 - Tue, Nov 18
PHL
Philadelphia
ATY
Watertown
$314 Roundtrip, found 5 days ago
$314
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Nov 8 from Philadelphia to Watertown, returning Tue, Nov 18, priced at $314 found 5 days ago
Delta
Sat, Nov 8 - Wed, Nov 12
PHL
Philadelphia
ATY
Watertown
$339 Roundtrip, found 5 days ago
$339
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Nov 8 from Philadelphia to Watertown, returning Wed, Nov 12, priced at $339 found 5 days ago
Delta
Tue, Nov 18 - Thu, Nov 27
PHL
Philadelphia
ATY
Watertown
$354 Roundtrip, found 6 days ago
$354
Roundtrip
found 6 days ago
Select Delta flight, departing Tue, Nov 18 from Philadelphia to Watertown, returning Thu, Nov 27, priced at $354 found 6 days ago
Delta
Sat, Nov 22 - Sun, Nov 23
PHL
Philadelphia
ATY
Watertown
$364 Roundtrip, found 6 days ago
$364
Roundtrip
found 6 days ago
Select Delta flight, departing Sat, Nov 22 from Philadelphia to Watertown, returning Sun, Nov 23, priced at $364 found 6 days ago
Delta
Thu, Nov 20 - Thu, Nov 27
PHL
Philadelphia
ATY
Watertown
$369 Roundtrip, found 6 days ago
$369
Roundtrip
found 6 days ago
Select Delta flight, departing Thu, Nov 20 from Philadelphia to Watertown, returning Thu, Nov 27, priced at $369 found 6 days ago
Delta
Sat, Nov 8 - Mon, Nov 17
PHL
Philadelphia
ATY
Watertown
$374 Roundtrip, found 5 days ago
$374
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Nov 8 from Philadelphia to Watertown, returning Mon, Nov 17, priced at $374 found 5 days ago
United
Fri, Nov 21 - Thu, Nov 27
PHL
Philadelphia
ATY
Watertown
$451 Roundtrip, found 6 days ago
$451
Roundtrip
found 6 days ago
Select United flight, departing Fri, Nov 21 from Philadelphia to Watertown, returning Thu, Nov 27, priced at $451 found 6 days ago

Frequently asked questions

How much does a flight from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY) cost?
Lock in a cheap one-way flight from $261 or cheap return flight from $244 from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY)?
Planning your getaway for November can help you save, as it's the cheapest month for flights between PHL and ATY. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY)?
Use the filters on Expedia to compare different airlines and find the most affordable carrier that'll take you from PHL to ATY. Then, sort your results by "Price (lowest to highest)" to score the best deal available.
How many flights per day from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY)?
There are no daily direct flights departing from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY). But you can opt for flights with layovers. Filter your search results on Expedia to include one or more stops, and you'll be soaring above the clouds in no time at all.
What day of the week has the most flights from PHL to ATY?
Generally you'll find the largest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can vary depending on the season, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY)?
To arrive at Watertown Regional Airport (ATY) on schedule, opt for a flight that takes off from Philadelphia Intl. Airport (PHL) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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.
Is it cheaper to buy a plane ticket from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY) last-minute?
Booking your ticket from PHL to ATY right before your journey is usually more expensive. But if there's some wiggle room with your schedule, you could land a cheap last-minute fare.
Is it cheaper to book a PHL to ATY flight and hotel package?
Compared with arranging flights and hotels separately, booking a PHL to ATY flight and hotel package with Expedia could lead to significant savings. What's more, having everything in one convenient place takes the hassle out of travel planning. Just secure your flights and select from our wide range of stays, then tailor your trip with other add-ons like activities, tours and car rentals.
Can I cancel or change the date of my flight from Philadelphia Intl. Airport (PHL) to Watertown Regional Airport (ATY)?
If you reserved your PHL to ATY flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the ticket type you purchased, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for more information.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Watertown Regional
Roundtrip price
$243
Distance
1167 mi

Book with confidence

Philadelphia to Watertown Flights

The cheapest times to fly from Philadelphia 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 Philadelphia to Watertown are during the month of November. You can find some of the cheapest flights from Philadelphia to Watertown with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Philadelphia to Watertown

Sunday is one of the best days to book for cheap flights from Philadelphia 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 Philadelphia 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 Philadelphia to Watertown in 2025. You can also book with separate airlines for your outbound and return journeys, from $261 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 Philadelphia 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 Philadelphia 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.

 

Philadelphia to Watertown Flights

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*Available to One Key members.