FrontierAirlines' flight change and cancellation policy can vary based on the type of ticket you purchased (whether it's refundable or non-refundable) and the fare rules associated with it. Here are the general guidelines:

Flight Change Policy:
Flex Fares (Business Class and Economy Flex):

Changes are generally allowed without a fee, but you may need to pay the fare difference if the new flight is more expensive.
If you change to a cheaper flight, you might not receive a refund for the fare difference.
Standard Fares (Economy Classic, Economy Flex, Business Saver):

Changes may be allowed with a fee, and you may also need to pay the fare difference.
The fee and conditions depend on the fare rules of your ticket.
Light and Basic Fares (Economy Light, Business Basic):

Changes are generally not permitted or may only be allowed for a fee plus the fare difference.
These tickets are often non-refundable.
Flight Cancellation Policy:
Flex Fares (Business Class and Economy Flex):

Cancellations are generally allowed with a refund, although some administrative fees may apply.
Standard Fares (Economy Classic, Economy Flex, Business Saver):

Cancellations may be allowed with a refund, but usually, a cancellation fee will apply, and the refund amount can depend on the fare rules.
Light and Basic Fares (Economy Light, Business Basic):

These tickets are often non-refundable or may have very limited refund options, depending on the fare rules.
Important Notes:
Fare Rules: Always check the specific fare rules associated with your ticket, as they determine the exact penalties and conditions for changes and cancellations.

Refunds: Refunds, if applicable, are typically issued in the original form of payment.

How to Change/Cancel: Changes and cancellations can often be made online through the Frontierwebsite or mobile app. You may also contact Frontier customer service or your booking agent.

To get the most accurate information regarding your specific booking, including any fees and conditions, it's best to directly consult Lufthansa's website, your booking confirmation, or contact their customer service. Policies can also evolve, so checking closer to your travel date is advisable.