Syntroleum's Second Quarter 2013 Earnings Update Conference Call Scheduled for August 7, 2013

Syntroleum's Second Quarter 2013 Earnings Update Conference Call Scheduled for
August 7, 2013

TULSA, Okla., July 31, 2013 (GLOBE NEWSWIRE) -- Syntroleum Corporation
(Nasdaq:SYNM) today announced the Company will host a conference call for
investors to discuss its second quarter 2013 results.

The conference call will be held on Wednesday, August 7, 2013, at 2:00 p.m.
Central time (3:00 p.m. Eastern).A webcast of the call will be available via
the Internet by accessing should allow a few
minutes for registration into the web site.To participate in the
teleconference, investors should dial 1-877-300-8521 about 10 minutes before
the start time and reference the Syntroleum conference call.International
callers should dial 1-412-317-6026.A replay of this conference call will be
available on the web site under the Syntroleum Investor Relations tab.

For additional information see the Company's Form 10-Q for the six months
ended June 30, 2013, to be filed with the SEC on Tuesday, August 6, 2013.The
10-Q will be available through the Investor Relations section of the Company's
Web site, on August 6, 2013.

About Syntroleum (Nasdaq:SYNM)

Syntroleum Corporation owns the Syntroleum® Process for Fischer-Tropsch (FT)
conversion of synthesis gas into liquid hydrocarbons, the Synfining® Process
for upgrading FT liquid hydrocarbons into refined petroleum products, and the
Bio-Synfining® technology for converting renewable feedstocks into drop-in
fuels.For additional information, visit the Company's web site at

This document may contain forward-looking statements within the meaning of the
Private Securities Litigation Reform Act of 1995, as well as historical facts.
These forward-looking statements include statements relating to the
Fischer-Tropsch ("FT") process, Syntroleum® Process, Synfining® Process, and
related technologies including, gas-to-liquids ("GTL"), coal-to-liquids
("CTL") and biomass-to-liquids ("BTL"), our renewable fuels Bio-Synfining®
Technology (hereinafter "Technologies"), plants based on these Technologies,
anticipated cost and schedule to design, construct and operate plants,
expected production of fuel, obtaining required financing for these plants and
other activities, the value and markets for products, testing, certification,
characteristics and use of plant products, the continued development of our
Technologies, use of proceeds from our equity offerings, anticipated revenues,
availability of catalyst, our support of and relationship with our licensees,
and any other forward-looking statements including future growth, cash needs,
capital availability, operations, business plans and financial results. When
used in this document, the words "anticipate," "believe," "estimate,"
"expect," "intend," "may," "plan," "project," "should" and similar expressions
are intended to be among the statements that identify forward-looking
statements. Although we believe that the expectations reflected in these
forward-looking statements are reasonable, these kinds of statements involve
risks and uncertainties. Actual results may not be consistent with these
forward-looking statements. Syntroleum undertakes no obligation to update or
revise forward-looking statements to reflect changed assumptions, the
occurrence of unanticipated events or changes to future operating results over
time. Important factors that could cause actual results to differ from these
forward-looking statements are described under "Item 1A. Risk Factors" and
elsewhere in our 2012 Annual Report on Form 10K.

®"Syntroleum," "Synfining," and "Bio-Synfining" are registered as trademarks
and service marks in the U.S. Patent and Trademark Office.

CONTACT: Ron Stinebaugh
         Syntroleum Corporation
         (918) 764-3406

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