Company: FLYW
Filing Date: 2025-02-26
Form Type: S-8
Source: 0001193125-25-036883
Chunk: 1

Company: Flywire Corp
Filing Date: 2025-02-26
Form: S-8
Chunk 1
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 the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

PART I

EXPLANATORY NOTE

INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS

This Registration Statement on Form S-8 registers additional shares of voting common stock to be issued pursuant to
the Registrant’s 2021 Equity Incentive Plan and 2021 Employee Stock Purchase Plan. The information contained in the Registrant’s registration statement on Form S-8 (SEC File Nos. 333-256695, 333-263956, 333-270587 and 333-277440), together with all exhibits filed therewith
or incorporated therein by reference, are hereby incorporated by reference pursuant to General Instruction E to Form S-8.

PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT Item 8. Exhibits. EXHIBIT INDEX

| Exhibit 
 Number  |     | Description of Exhibit                                                                              |
| 5.1*    |     | Opinion of Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP.                           |
| 23.1*   |     | Consent of PricewaterhouseCoopers LLP, independent registered public accounting firm.               |
| 23.2*   |     | Consent of Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP (included in Exhibit 5.1). |
| 24.1*   |     | Power of Attorney (included in the signature page to the registration statement).                   |
| 107*    |     | Filing Fee Table.                                                                                   |

| * | Filed herewith. |

II-1

SIGNATURES Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, Commonwealth of Massachusetts on this 26 thday of February, 2025.

| FLYWIRE CORPORATION |     |                         |
| By:                 |     | /s/ Michael Massaro     |
|                     |     | Michael Massaro         |
|                     |     | Chief Executive Officer |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS that