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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-16 OR 15D-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2025

Commission File Number: 001-36185

DYNAGAS LNG PARTNERS LP

(Translation of registrant’s name into English)

Poseidonos Avenue and 2 Foivis Street

166 74 Glyfada, Athens, Greece

(Address of principal executive office)

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

Form 20-F ☒ Form 40-F ☐

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

Attached as Exhibit 99.1 to this Report on Form 6-K (this “Report”) is management’s discussion and analysis of financial condition and results of operations and interim unaudited consolidated financial statements for the six months ended June 30, 2025 of Dynagas LNG Partners LP (the “Partnership”).

The information contained in this Report is hereby incorporated by reference into the Partnership’s registration statement on Form F-3 (File No. 333-281195) that has an effective date of November 13, 2024.

FORWARD-LOOKING STATEMENTS

Matters discussed in this Report on Form 6-K may constitute forward-looking statements. The Private Securities Litigation Reform Act of 1995 provides safe harbor protections for forward-looking statements in order to encourage companies to provide prospective information about their business. Forward-looking statements include statements concerning plans, objectives, goals, strategies, future events or performance, and underlying assumptions and other statements, which are other than statements of historical facts.

The Partnership desires to take advantage of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995 and is including this cautionary statement in connection with this safe harbor legislation. The words “believe,” “anticipate,” “intends,” “estimate,” “forecast,” “project,” “plan,” “potential,” “project,” “will,” “may,” “should,” “expect,” “expected,” “pending” and similar expressions identify forward-looking statements. These forward-looking statements are not intended to give any assurance as to future results and should not be relied upon.

The forward-looking statements in this Report on Form 6-K are based upon various assumptions and estimates, many of which are based, in turn, upon further assumptions, including without limitation, examination by the Partnership’s management of historical operating trends, data contained in its records and other data available from third parties. Although the Partnership believes that these assumptions were reasonable when made, because these assumptions are inherently subject to significant uncertainties and contingencies which are difficult or impossible to predict and are beyond the Partnership’s control, the Partnership cannot assure you that it will achieve or accomplish these expectations, beliefs or projections.

In addition to these important factors, other important factors that, in the Partnership’s view, could cause actual results to differ materially from those discussed, expressed or implied, in the forward-looking statements include, but are not limited to, the strength of world economies and currency fluctuations, general market conditions, including fluctuations in charter rates, ownership days, and vessel values, changes in supply of and demand for liquefied natural gas (LNG) shipping capacity, changes in the Partnership’s operating expenses, including bunker prices, drydocking and insurance costs, the market for the Partnership’s vessels, availability of financing and refinancing, changes in governmental laws, rules and regulations or actions taken by regulatory authorities, economic, regulatory, political and governmental conditions that affect the shipping and the LNG industry, potential liability from pending or future litigation, and potential costs due to environmental damage and vessel collisions, general domestic and international political conditions, potential disruption of shipping routes due to accidents, political events, or international hostilities, geopolitical events including ongoing conflicts and hostilities in the Middle East and other regions throughout the world and the global response to such conflicts and hostilities, changes in tariffs, trade barriers, and embargos, including recently imposed tariffs by the U.S. and the effects of retaliatory tariffs and countermeasures from affected countries, vessel breakdowns, instances of off-hires, the length and severity of epidemics and pandemics, the impact of public health threats and outbreaks of other highly communicable diseases, the amount of cash available for distribution, and other factors. Due to the ongoing war between Russia and Ukraine, the United States, United Kingdom, the European Union, Canada, and other Western countries and organizations have announced and enacted numerous sanctions against Russia to impose severe economic pressure on the Russian economy and government. The full impact of the commercial and economic consequences of the Russian conflict with Ukraine are uncertain at this time. Although currently there has been no material impact on the Partnership, potential consequences of the sanctions that could impact the Partnership’s business in the future include but are not limited to: (1) the Partnership’s counterparties being potentially limited by sanctions from performing under its agreements; and (2) a general deterioration of the Russian economy. In addition, the Partnership may have greater difficulties raising capital in

the future, which could potentially reduce the level of future investment into its expansion and operations. The Partnership cannot provide any assurance that any further development in sanctions, or escalation of the Ukraine situation more generally, will not have a significant impact on its business, financial condition, or results of operations.

Please see the Partnership’s filings with the U.S. Securities and Exchange Commission for a more complete discussion of these and other risks and uncertainties. The information set forth herein speaks only as of the date hereof, and the Partnership disclaims any intention or obligation to update any forward-looking statements as a result of developments occurring after the date of this communication, except as otherwise required by law.

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.

	DYNAGAS LNG PARTNERS LP (Registrant)

Dated: September 18, 2025

	By:	/s/ Michael Gregos
		Michael Gregos
		Chief Financial Officer

Dynagas LNG Partners LP 6-K