<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2020-04-17</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001600132</issuerCik>
        <issuerName>Bellerophon Therapeutics, Inc.</issuerName>
        <issuerTradingSymbol>BLPH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001718111</rptOwnerCik>
            <rptOwnerName>Puissance Cross-Border Opportunities III LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>950 THIRD AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>25TH FL</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001695347</rptOwnerCik>
            <rptOwnerName>Puissance Capital Fund (GP) LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>950 THIRD AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>25TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001658437</rptOwnerCik>
            <rptOwnerName>Puissance Capital Management LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>950 THIRD AVENUE, 25TH FLOOR</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001695339</rptOwnerCik>
            <rptOwnerName>Puissance Capital Management (GP) LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>950 THIRD AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2>25TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001694061</rptOwnerCik>
            <rptOwnerName>Wang Theodore T</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PUISSANCE CAPITAL MANAGEMENT LP</rptOwnerStreet1>
            <rptOwnerStreet2>950 THIRD AVENUE, 25TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2020-04-17</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>553250</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Puissance Cross-Border Opportunities III LLC</value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Puissance Cross-Border Opportunities III LLC made an in-kind distribution of an aggregate 553,250 shares of the Issuer's common stock to its limited partners in connection with the redemption of partnership interests.</footnote>
        <footnote id="F2">These securities are held directly by Puissance Cross-Border Opportunities III LLC and may be deemed to be beneficially owned by Puissance Capital Management LP, the investment manager of Puissance Cross Border Opportunities III LLC; Puissance Capital Management (GP) LLC, the general partner of Puissance Capital Management LP; Puissance Capital Fund (GP) LLC, the general partner of Puissance Cross Border Opportunities III LLC; and Theodore T. Wang, the managing member of Puissance Capital Management (GP) LLC and Puissance Capital Fund (GP) LLC. The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein. This report shall not be deemed an admission that the Reporting Person is the beneficial owner of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Puissance Cross-Border Opportunities III LLC, By: Puissance Capital Fund (GP) LLC, its general partner, By: Theodore T. Wang, Managing Member</signatureName>
        <signatureDate>2020-04-20</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Puissance Capital Fund (GP) LLC, By: Theodore T. Wang, Managing Member</signatureName>
        <signatureDate>2020-04-20</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Puissance Capital Management LP, By: Puissance Capital Management (GP) LLC, its general partner, By: Theodore T. Wang, Managing Member</signatureName>
        <signatureDate>2020-04-20</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Puissance Capital Management (GP) LLC, By: Theodore Wang, Managing Member</signatureName>
        <signatureDate>2020-04-20</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Theodore T. Wang</signatureName>
        <signatureDate>2020-04-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
