Company: TCOM
Filing Date: 2025-06-18
Form Type: 6-K
Source: 0001193125-25-142448
Chunk: 0

Company: Trip.com Group Ltd
Filing Date: 2025-06-18
Form: 6-K
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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 June 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

This current report on Form 6-K is being furnished to report that following the pricing of the underwritten public offering of ordinary shares of MakeMyTrip
Limited (“MakeMyTrip”), an investee of Trip.com Group Limited (the “Company”), it is expected that MakeMyTrip will pay between around US$2.5 billion and around US$3.0 billion as consideration for the sale of a portion of
MakeMyTrip’s Class B ordinary shares held by the Company to MakeMyTrip pursuant to the share repurchase agreement entered into on June 16, 2025. The closing of the repurchase transaction is contingent upon the closing of MakeMyTrip’s
underwritten public offering of ordinary shares and concurrent offering of convertible senior notes pursuant to Rule 144A, among other things, in accordance with the share repurchase agreement.

EXHIBIT INDEX

| Exhibit No. |     | Description                                                                       |
| 99.1        |     | Press Release – Trip.com Group Announces Updates on Its Investments in MakeMyTrip |

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: June 18, 2025