$815 Cheap Flights from Baltimore (BWI) to Kos (KGS)

View $815 flight on Wed, Sep 23, 2026Opens in a new window

Popular airlines from Baltimore Washington Intl. Airport (BWI) to Kos (KGS-Kos Island Intl.)

  • notification illustration

    Be in the know

    Get alerts if flight prices drop or rise*
  • deals illustration

    Book smarter

    Save up to 30% on select hotels after you book a flight*
  • trophy illustration

    Earn twice

    Earn your airline miles on top of our OneKeyCash
    Learn about One Key

Cheap Flights from Baltimore to Kos (BWI-KGS)

Prices were available within the past 7 days and start at $815 for one-way flights and $1,627 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Tue, Jul 7 - Thu, Jul 16
BWI
Baltimore
KGS
Kos
$1,627 Roundtrip, found 4 days ago
$1,627
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue, Jul 7 from Baltimore to Kos, returning Thu, Jul 16, priced at $1,627 found 4 days ago
British Airways
Sun, Jul 12 - Thu, Aug 20
BWI
Baltimore
KGS
Kos
$1,723 Roundtrip, found 4 days ago
$1,723
Roundtrip
found 4 days ago
Select British Airways flight, departing Sun, Jul 12 from Baltimore to Kos, returning Thu, Aug 20, priced at $1,723 found 4 days ago
Finnair
Tue, Jul 7 - Thu, Jul 16
BWI
Baltimore
KGS
Kos
$3,242 Roundtrip, found 4 days ago
$3,242
Roundtrip
found 4 days ago
Select Finnair flight, departing Tue, Jul 7 from Baltimore to Kos, returning Thu, Jul 16, priced at $3,242 found 4 days ago
Iberia
Tue, Jul 7 - Thu, Jul 16
BWI
Baltimore
KGS
Kos
$3,251 Roundtrip, found 4 days ago
$3,251
Roundtrip
found 4 days ago
Select Iberia flight, departing Tue, Jul 7 from Baltimore to Kos, returning Thu, Jul 16, priced at $3,251 found 4 days ago
British Airways
Sun, Jul 12 - Thu, Jul 16
BWI
Baltimore
KGS
Kos
$4,019 Roundtrip, found 4 days ago
$4,019
Roundtrip
found 4 days ago
Select British Airways flight, departing Sun, Jul 12 from Baltimore to Kos, returning Thu, Jul 16, priced at $4,019 found 4 days ago
Flights from Baltimore (BWI) to Kos (KGS)
Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Kos Island Intl.
Roundtrip price
$1,627
Distance
5296 mi

Baltimore to Kos Flights

The cheapest times to fly from Baltimore to Kos

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

 

The best time to book a flight from Baltimore to Kos

Sunday is one of the best days to book for cheap flights from Baltimore to Kos: 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 Baltimore to Kos

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 Baltimore to Kos in 2025. You can also book with separate airlines for your outbound and return journeys, from $815 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 Baltimore to Kos 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 Baltimore to Kos 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS) cost?
Snag a cheap one-way flight from $815 or cheap return flight from $1,627 from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS) 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS)?
The cheapest month to fly from BWI to KGS is July, when demand is low. Off-peak season is usually when you'll find cheap fares for travel between these airports.
What is the cheapest airline that flies from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS)?
Expedia's filter tool lets you easily compare travel time, airlines and fares all in one place. Choose your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest BWI to KGS flight.
How many flights per day from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS)?
You'll have to take a flight with a layover when traveling from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS). Direct flights don't operate daily on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from BWI to KGS?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be 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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS)?
To arrive at Kos Island Intl. Airport (KGS) without delays, book a flight that leaves Baltimore Washington Intl. Thurgood Marshall Airport (BWI) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**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 Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS) last-minute?
Last-minute bookings from BWI to KGS are typically more expensive. To secure the cheapest rates, start searching for flights as soon as possible. That said, if your travel plans are flexible, you may find a cheap fare right before your trip.
Is it cheaper to book a BWI to KGS flight and hotel package?
Compared with arranging hotels and flights separately, booking a BWI to KGS flight and hotel package with Expedia could result in significant savings. Better still, having it all in one place will take the hassle out of planning your trip. Just secure your flights and select from our wide range of stays, then personalize your trip with extras like car rentals and activities.
Can I cancel or change the date of my flight from Baltimore Washington Intl. Thurgood Marshall Airport (BWI) to Kos Island Intl. Airport (KGS)?
In most instances, you can modify or cancel your BWI to KGS flight. However, there may be additional charges, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you'd like further information, head to our Customer Service portal.

Explore a world of travel with Expedia

*Available to One Key members.