Delta has issued a travel waiver for flights to and from Seoul, South Korea and has cancelled two flights ahead of the impact of Typhoon Bavi, a tropical storm expected to affect the country today.

The waiver allows customers to make a one-time change to their itinerary without incurring a change fee.

The US airline says its team is monitoring the impact of Typhoon Bavi, which is one of South Korea’s most powerful storms this year, according to local newspaper The Korea Herald.

Flights have been cancelled at several airports across South Korea including Incheon International Airport, Jeju International Airport and Gimpo International Airport, according to the report.

“Customers are encouraged to check their flight status on or the Fly Delta Mobile App. Customers can also get updates sent directly to their mobile device or by email,” reads a statement from the airline.