Company: TCOM
Filing Date: 2025-04-11
Form Type: 6-K
Source: 0001193125-25-078474
Chunk: 0

Company: Trip.com Group Ltd
Filing Date: 2025-04-11
Form: 6-K
Chunk 0
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### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of April 2025

Commission File Number: 001-33853

Trip.com Group Limited

(Registrant’s Name)

30 Raffles Place, #29-01

Singapore 048622

(Address of Principal Executive Offices)

Indicate by check mark whether
the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

EXPLANATORY NOTE

Trip.com Group Limited (the “Company”) filed its annual report on Form 20-F for the fiscal year ended
December 31, 2024 with the United States Securities and Exchange Commission on April 11, 2024, U.S. Eastern Time. On April 11, 2024, Hong Kong Time, the Company also published its annual report for the fiscal year ended December 31, 2024
(the “HK Annual Report”) pursuant to the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited (the “HKEX Listing Rules”). Pursuant to the HKEX Listing Rules, the HK Annual Report contains
supplemental disclosure of reconciliation of the material differences between the consolidated financial statements of the Company prepared under the U.S. GAAP and International Financial Reporting Standards, which has been attached hereto as
exhibit 99.1.

EXHIBIT INDEX

| Exhibit No. |     | Description                                                                                                |
| 99.1        |     | Supplemental Disclosure — Reconciliation Between U.S. GAAP and International Financial Reporting Standards |

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

| TRIP.COM GROUP LIMITED |     |                         |
| By:                    |     | /s/ Cindy Xiaofan Wang  |
| Name:                  |     | Cindy Xiaofan Wang      |
| Title:                 |     | Chief Financial Officer |

Date: April 11, 2025