| Cover | Aug. 19, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 19, 2021 |
| Entity File Number | 001-35570 |
| Entity Registrant Name | SONNET BIOTHERAPEUTICS HOLDINGS, INC. |
| Entity Central Index Key | 0001106838 |
| Entity Tax Identification Number | 20-2932652 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 100 Overlook Center |
| Entity Address, Address Line Two | Suite 102 |
| Entity Address, City or Town | Princeton |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08540 |
| City Area Code | (609) |
| Local Phone Number | 375-2227 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.0001 Par Value |
| Trading Symbol | SONN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
