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£358 Cheap Flights from Philadelphia (PHL) to Kos (KGS)

View £358 flight on Thu, 9 Jul 2026Opens in a new window

Popular airlines from Philadelphia International Airport (PHL) to Kos (KGS-Kos Island Intl.)

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Cheap Flights from Philadelphia (PHL) to Kos (KGS)

Prices were available within the past 7 days and start at £358 for one-way flights and for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frequently asked questions

How much does a flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) cost?
You can find one-way and return flights from PHL to KGS with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when PHL to KGS ticket fares go up or down.
What is the cheapest month to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
The cheapest months to fly from PHL to KGS are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
Enter PHL to KGS and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
What is the cheapest airline that flies from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
Air Canada is one of the cheapest airlines offering connecting return flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.), with prices starting from around £861 for flights that can be booked for departure within the next year. These flights typically include a layover in Pierre Elliott Trudeau Intl. (YUL). Prices are per adult, for economy/coach class. Use Expedia's search tool to compare the prices and schedules of airlines that fly this route to find the best option for your plans and budget.
How do I find cheap flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
To find a cheap flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
There are approximately 13 connecting flights per day from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.). Some common connection points include Pearson Intl. (YYZ), Pierre Elliott Trudeau Intl. (YUL), and Washington Dulles Intl. (IAD).
What is the earliest flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
The earliest flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) typically departs around 5:30 AM. This seasonal service is active in May and is operated by airlines like Delta and Sky Express. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
You'll typically find the most flights from Philadelphia International Airport (PHL) to Kos Island International Airport (KGS) on a Sunday, with around 17 flights available. This gives you a good selection of options for your journey. Major airlines on this route include Delta, American Airlines, and Air Canada.
What are the most popular departure times for flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
The most popular departure times for flights from Philadelphia Intl. (PHL) to Kos Island Intl. (KGS) are in the morning, between 9am and 12pm. Many major carriers, including Air Canada, United and Delta, offer flights during this window. Many travellers prefer this time as it allows for an early start to their journey, getting them to their destination with plenty of time left in the day.
How long does it take to fly from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
There are no nonstop flights from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.). The distance between these two airports is approximately 8,380 kilometres. Flights with one stop typically take around 19 hours. If you opt for flights with two or more stops, your journey will usually be a bit longer, averaging about 20 hours and 53 minutes. Keep in mind that actual flight times can vary due to factors like layover duration, routing, and wind patterns.
Can you fly business or first class from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
Select the "Business class" and "First class" filters when looking for PHL to KGS flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) flight with Expedia?
It's easy to earn miles on a Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Kos (KGS) from Philadelphia, PA (PHL)?
If you're planning to travel to Kos from Philadelphia Intl. (PHL), you can fly directly into Kos Island Intl. (KGS). Some flights may connect through major hubs like Pierre Elliott Trudeau Intl. (YUL), Washington Dulles Intl. (IAD), or Hartsfield-Jackson Atlanta Intl. (ATL) before reaching Kos. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) at the last minute?
Typically, booking a last minute flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) flight and hotel package?
Securing a Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.)?
If you booked your Philadelphia, PA (PHL-Philadelphia Intl.) to Kos (KGS-Kos Island Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, 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 if you'd like more information.

Travel information

Origin airport
Philadelphia Intl.
Destination airport
Kos Island Intl.
Distance
8329 km

Book with confidence

Compare flights from Philadelphia to Kos easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from Philadelphia to Kos. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Kos Island Intl. in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Philadelphia Intl. to Kos Island Intl..  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Philadelphia Intl. (PHL) to Kos Island Intl. (KGS)

The easiest way to view the best deals on flights from Philadelphia to Kos today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Philadelphia Intl. to Kos Island Intl. start at just and range up to .  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near Philadelphia and Kos
  • booking your flight during , the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your Philadelphia to Kos flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Philadelphia Intl. to Kos Island Intl. for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from Philadelphia to Kos easily and book with confidence

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