Sun Country Flight Change Policy from United Airlines's blog

The Sun Country Flight Change Policy states that although airfares (including optional extras like seat preference and luggage) are non-refundable, they may be modified or cancelled prior to departure, less any relevant change fees. Changes made, however, 60 days or more before departure are free.

each passenger and each segment, there are changing fees. 

You must pay the difference if your new airfare is more expensive. 

If the new fare is less expensive, you will be given a flight voucher that must be used for travel within a year of the original purchase date.

Sun Country's Change of Plane Policy Because of Illness

Sun Country may extend the validity of your ticket for an additional 30 days if you or a member of your immediate family is unable to travel (or continue your journey) due to illness or physical infirmity. 

To utilize this service: 

The condition must be officially documented in writing by a doctor. 

The document must state that your illness or infirmity prevents you from finishing your trip before the initial time restriction expires. 

To Sun Country, you must deliver the certificate along with your ticket and the relevant receipts.

The certificate must be signed by a Sun Country representative stating that you have been granted the travel extension.

Sun Country Flight Change Procedure

How can I make changes to my Sun Country flight? 

Only if you made a direct reservation through Sun Country (online, call center, or ticket office) or Expedia are you able to make changes to a flight-only reservation over the phone () or online via My Trips. Changes might be made in terms of the departure date or cancellation. You can call and make any additional changes. 

Through My Trips, it is possible to adjust the dates of any Expedia-purchased tickets. 

Flight and hotel reservations can both be changed (or canceled) over the phone.

If you made your reservation directly via SunCountry.com, you can modify (or cancel) it online through My Trips. Only the travel dates are subject to alter; any other modifications must be contacted by phone.

As long as you make your reservation directly via Sun Country's recommended partners (Avis and Budget), you can modify (or cancel) a car-only reservation over the phone or online at the Avis/Budget website. Simply enter your last name and the confirmation number you were given when you made your reservation if you're making changes online.

How to Onlinely Change a Sun Country Flight

How do I modify a Sun Country flight online?

Online flight changes for Sun Country Airlines:

the website SunCountry 

Select the "My Trips" option.

Type your:

final name 

Reservation Code, 6 characters

Select "Manage My Trip" 

Choose a flight. 

By adhering to the on-screen directions, cancel it.

Sun Country Waiver of Change Fees

What is the Change Fee Waiver at Sun Country?

You can modify your flight reservation once without paying a change fee if you purchase a change fee waiver at the time of booking and do so up to an hour before the departure of your first flight. 

You must pay the difference in rate (together with any additional services, taxes, and fees that may be offered by the airline) if your new flight ticket is more expensive. The usual flight change cost will apply to any further modifications. 

The Waiver of Change Fees:

only applies to flight reservations.

can only be used once to change a flight reservation without paying a change fee.

Only if you make your reservation directly through SunCountry.com, the gateway for Sun Country travel agents, or by calling Sun Country customer care, can be added to your reservation at the time of booking.

All travelers listed on the reservation must make the purchase. 

gives you the option to modify your flight's date, time, destination, or point of origin—at least one hour before to the first flight's departure.

is offered on a few flights. 

You will receive a non-refundable, non-transferrable ticket credit for future travel if your new flight is less expensive. 

Can be utilized from 59 days up until one hour prior to travel because adjustments and cancellations are free 60 days or more in advance.

Sun Country Change of Plane Fee

How much does a Sun Country flight change cost?

According to the table below, the Sun Country flight change cost (per direction) will vary depending on how soon you make the modifications. 

Changes to a flight that are made at least 60 days prior to departure are free.

A change fee of USD 36 per segment will be charged for flights changed between 59 and 14 days prior to departure. 

A change fee of USD 79 per segment will be charged for flights that are changed 13–0 days prior to departure. 

The Best Way to Use Your Sun Country Flight Credit

You will receive an email from Sun Country advising you of the entire amount of the flight credit if you receive one after canceling or modifying a flight. Flight credits, which can be used to reserve a new flight on SunCountry.com, expire one year after the original date of purchase.

After January 20, 2021, flight vouchers will take their place in place of flight credits.

In order to use a flight credit:

Check out SunCountry.com 

Plan a new journey.

You must provide your 6-character flight credit code, which is the same as the Reservation Code for your initial flight. You would have gotten it after changing or canceling your flight or itinerary, and it is displayed on top of the original booking confirmation email. 

Select Use a Sun Country flight credit or voucher on the Review and Pay page.

Enter the following data now:

Last name of any traveler listed on the initial reservation

Flight Credit Code in 6 characters 

To apply for credit, click.

(If you have more than one flight credit, enter more.)

If a further payment is required:

Type in your credit card information. 

Choose "Accept & Pay"

Your registered email address will receive your new e-ticket. 

How to Use a Sun Country Travel Coupon

You will be sent an email with the total value of your flight voucher if you obtain a Sun Country Flight Voucher as a result of a changed/cancelled flight or operational issues prior to or during a flight. Up to one year from the original booking date, you can use your flight voucher to purchase a new ticket on SunCountry.com.

To use an online flight voucher:

Check out SunCountry.com 

Plan a new journey.

Note. Use the 17-digit flight voucher code found on the email you received after receiving the flight coupon to make your new travel arrangements. 

Select Use a Sun Country flight credit or voucher on the Review and Pay page.

the 17-digit code for the flight voucher

Then select Apply Voucher Note. If you have more than one flight voucher, you may input more than one.

If you still have additional costs:

Type in your credit card information. 

Choose "Accept & Pay"