Syntroleum's 2012 Earnings and Dynamic Fuels Plant Update Conference Call Scheduled for March 18, 2013

Syntroleum's 2012 Earnings and Dynamic Fuels Plant Update Conference Call
Scheduled for March 18, 2013

TULSA, Okla., March 14, 2013 (GLOBE NEWSWIRE) -- Syntroleum Corporation
(Nasdaq:SYNM) today announced the Company will host a conference call for
investors to discuss its 2012 results and to update the status of the Dynamic
Fuels Geismar Plant.

The conference call will be held on Monday, March 18, 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 Listeners should allow a few
minutes for registration into the web site. To participate in the
teleconference, investors should dial 1-877-317-6789 about 10 minutes before
the start time and reference the Syntroleum conference call. International
callers should dial 1-412-317-6789. 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-K for the year ended
December 31, 2012, to be filed with the SEC on Friday, March 15, 2013. The
10-K will be available through the Investor Relations section of the Company's
Web site, on March 15, 2013.

About Syntroleum

Syntroleum Corporation owns the Syntroleum® Process for Fischer-Tropsch (FT)
conversion of synthesis gas derived from biomass, coal, natural gas and other
carbon-based feedstocks into liquid hydrocarbons, the Synfining® Process for
upgrading FT liquid hydrocarbons into middle distillate products such as
synthetic diesel and jet fuels, and the Bio-Synfining® technology for
converting animal fat and vegetable oil feedstocks into middle distillate
products such as renewable diesel and jet fuel using inedible fats and greases
as feedstock. The 50/50 venture – known as Dynamic Fuels – was formed to
construct and operate multiple renewable synthetic fuels facilities, with
production on the first site beginning in 2010. The Company plans to use its
portfolio of technologies to develop and participate in synthetic and
renewable fuel projects. For additional information, visit the Company's web
site at

The Syntroleum Corporation logo is available at

This document includes forward-looking statements within the meaning of the
Private Securities Litigation Reform Act of 1995, as well as historical facts.
These forward‑looking statements may include statements relating to the
Syntroleum® Process, the Synfining® Process, our renewable fuels
Bio-Synfining® technology, plans to use the Company's various technologies,
operational activities of the Company, commercialization of the Company's
technologies, certification of Fischer-Tropsch and renewable
fuels,performance and use of Syntroleum's cobalt catalyst, and performance
and use of fuels derived from the Syntroleum® Process and technology test
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 include the potential that
debt or equity financing for anticipated plantsmay not be available, the
schedule for development, construction and operation of proposed plants may
not be met, anticipated appropriation and expenditure of federal monies does
not occur, commercial-scale plants do not achieve the same results as those
demonstrated on a laboratory or pilot basis or that such plants experience
technological and mechanical problems, the potential that improvements to
Syntroleum's various technologies currently under development may not be
successful, the impact on plant economics of operating conditions (including
energy prices), construction risks, risks associated with investments and
operations in foreign countries, our dependence on strategic relationships
with manufacturing and engineering companies, volatility of energy prices, the
ability to implement corporate strategies, including the continued
availability of adequate working capital, competition, intellectual property
risks, our ability to obtain financing and other risks described in the
Company's filings with the Securities and Exchange Commission.

® "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
         (281) 224-9862

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