For those planning to travel internationally, many will opt to renew their U.S. passport online so long as they meet certain eligibility requirements. However, once a passport application has been filed online, the old passport will be automatically cancelled and cannot be used for travel. So, if you plan on renewing your passport online, be sure to submit your application at least 6 weeks before any planned travel.
There are several requirements if you are planning on renewing your passport online:
No, if you applied for a passport renewal online, you do not need to mail in your old passport. You can keep your old passport - however, it will automatically be cancelled once you submit the renewal application.
If you are trying to renew your passport online before traveling internationally, you should submit your renewal application no less than 6 weeks before your travel dates.
You can check the status of your passport renewal here: https://passportstatus.state.gov/.