You can pause your subscription for $35 per month. Go to Account -> Membership on the app and you'll have the option to freeze your account. The freeze will take place on the end of your subscription month. You can unfreeze at any time. Your new subscription month will start the day you unfreeze.
You can also cancel at any time. The cancellation will be in effect at the end of your subscription month. If you decide to join again, you will be charged a $99 fee to sign up again. That is in addition to the subscription fee you'll pay for the first month when you sign up again. Any earned flight credits will be forfeited if you cancel.