Company: TCOM
Filing Date: 2025-08-28
Form Type: 6-K
Source: 0001193125-25-190294
Chunk: 0

Company: Trip.com Group Ltd
Filing Date: 2025-08-28
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 August 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 ☐

EXHIBIT INDEX

| Exhibit No. |     | Description                                                                                                    |
| 99.1        |     | Press Release—Trip.com Group Limited Reports Unaudited Second Quarter and First Half of 2025 Financial Results |

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: August 28, 2025