Exhibit 99.1

FOR IMMEDIATE RELEASE

NAVIGANT REPORTS FOURTH QUARTER AND FULL YEAR 2017 FINANCIAL RESULTS; PROVIDES 2018 OUTLOOK

CHICAGO, Feb. 20, 2018 – Navigant (NYSE: NCI) today announced financial results for the quarter and full year ended Dec. 31, 2017.

Fourth quarter 2017 financial summary:

Full year 2017 financial summary and 2018 Outlook:

“While we are disappointed by our 2017 financial results, which reflect a myriad of demand-side factors that impacted performance in each of our segments, we have taken actions to improve our operating performance by managing our cost structure and repositioning certain services to better align with emerging client needs,” said Julie Howard, Chairman and CEO of Navigant. “We continue to make progress in executing our long-term strategy while working to pivot our resources to address the short-term challenges impacting our business. With this backdrop, we expect moderate top-line growth in 2018, but anticipate that margin expansion and the benefit of Tax Reform will meaningfully improve our profitability and free cash flow. We continue to believe in the long-term growth prospects of our business and remain steadfast in our commitment to deliver value to our clients and to our shareholders.”

CONSOLIDATED RESULTS

Navigant reported fourth quarter 2017 revenues and RBR of $255.4 million and $230.7 million, respectively, down 4% compared to the fourth quarter 2016, reflecting lower revenue across each of our segments, including lower-than-anticipated results in our Healthcare segment. Adjusted EBITDA for the quarter was $32.3 million, down $2.5 million from the same prior year period as lower revenue was partially offset by lower incentive-based compensation and general and administrative expense.

Fourth quarter 2017 net income of $43.1 million was up $29.6 million compared to fourth quarter 2016, largely due to the $29.7 million net impact of Tax Reform. This was primarily driven by the re-valuation of our deferred tax obligations to reflect the lower corporate tax rate, as well as other provisional adjustments resulting from Tax Reform. Adjusted EPS was $0.29 for fourth quarter 2017, $0.01 lower than the prior year period.

Full year 2017 revenues and RBR of $1,032.3 million and $939.6 million, respectively, were both comparable to the prior year period. Results reflect the full year contribution from the Ecofys acquisition and growth in the Healthcare segment, primarily due to increased life science and managed services engagements. These contributions were offset by lower revenue from U.S. Federal Government engagements in the Energy segment, as well as decreased activity from regulatory uncertainty in the Financial Services Advisory and Compliance and Disputes, Forensics and Legal Technology segments. Full year 2017 Adjusted EBITDA was $125.8, down $16.5 million from full year 2016 driven by higher cost of service including absorbed costs from the Ecofys acquisition.

Full year 2017 net income of $75.0 million was up $16.9 million compared to full year 2016 as the impact of Tax Reform more than offset higher operating costs. Adjusted EPS was $1.09 for full year 2017, $0.18 lower than the prior year.

CASH FLOW

Fourth quarter 2017 net cash provided by operating activities was $70.7 million compared to $54.4 million for fourth quarter 2016, driven by higher income, net of deferred taxes and lower working capital in the fourth quarter 2017. Free Cash Flow increased to $24.6 million for fourth quarter 2017 compared to $7.9 million for the same period in 2016, due to higher operating cash flow as discussed above, and lower capital expenditures.

Full year 2017 net cash provided by operating activities was $104.2 million compared to $110.0 million for full year 2016, driven primarily by increased working capital requirements in the current year period. Free Cash Flow decreased to $65.7 million for full year 2017 compared to $78.8 million for the same period in 2016, due to lower operating cash flow as discussed above, and higher capital expenditures.

Days Sales Outstanding on Dec. 31, 2017 was 85 days, a 9-day improvement compared to Sept. 30, 2017, but was 4 days higher compared to Dec. 31, 2016. Bank debt outstanding on Dec. 31, 2017 was $132.9 million, down slightly compared to $135.0 million at year end 2016. Leverage (bank debt divided by trailing twelve month Adjusted EBITDA) was 1.06 times at Dec. 31, 2017.

Navigant continued executing its share repurchase program with an additional 838 thousand shares of common stock repurchased during the fourth quarter 2017 at an aggregate cost of $15.0 million and an average price of $17.89 per share. For the full year 2017, Navigant repurchased over 2.3 million shares of common stock at an aggregate cost of $43.0 million and an average price of $18.52 per share. As of Dec. 31, 2017, the company had $63.6 million remaining under its stock repurchase authorization which expires on Dec. 31, 2019.

FOURTH QUARTER 2017 SEGMENT RESULTS

Healthcare segment RBR of $89.7 million decreased 2%, or 3% on an organic basis, for fourth quarter 2017 compared to the same prior year period. Unanticipated delays in the timing of certain engagements and the smaller scope of new project work impacted results. Segment operating profit of $25.8 million declined 15% in fourth quarter 2017 compared to the same period in 2016, primarily due to lower revenue and increased headcount in revenue cycle managed services.

Energy segment RBR for fourth quarter 2017 was in line with expectations, but decreased 2% to $30.7 million compared to fourth quarter 2016. RBR was up 4% sequentially versus third quarter 2017. Contributions from the November 2016 Ecofys acquisition helped offset continued depressed demand from U.S. Federal Government engagements. Segment operating profit was down slightly compared to fourth quarter 2016 due to lower revenue.

Financial Services Advisory and Compliance segment RBR for fourth quarter 2017 was $35.7 million, a 7% decrease compared to fourth quarter 2016. RBR was driven by short-term delays with certain engagements which more than offset improving demand from financial services clients for non-regulatory related engagements. Segment operating profit was down $0.9 million as lower revenue was mostly offset by lower personnel costs.

Disputes, Forensics and Legal Technology segment RBR for fourth quarter 2017 was in line with expectations, but decreased $3.8 million to $74.6 million compared to the prior year period. Reduced processing activities in the legal technology solutions business and lower mass tort claims volume were only partially offset by strong performance in the global construction disputes practice. Segment operating profit was up $0.4 million in fourth quarter 2017 compared to fourth quarter 2016, as lower revenue was more than offset by lower personnel costs.

2018 OUTLOOK

Management provides its full year 2018 financial outlook:

NON-GAAP FINANCIAL INFORMATION

This press release includes certain non-GAAP financial measures as defined by the Securities and Exchange Commission. Reconciliations of these non-GAAP financial measures to the most directly comparable financial measure calculated and presented in accordance with generally accepted accounting principles (GAAP) are included in the financial schedules attached to this press release. This information should be considered as supplemental in nature and not as a substitute for, or superior to, any measure of performance prepared in accordance with GAAP.

Navigant has provided guidance regarding Adjusted EBITDA and Adjusted Earnings Per Share, both of which exclude the impact of severance expense and other operating costs (benefit). Navigant is not able to accurately forecast the excluded items at the level of precision that would be required to be included in the most directly comparable GAAP financial measure without unreasonable efforts.

CONFERENCE CALL DETAILS

Navigant will host a conference call to discuss the company’s fourth quarter and full year 2017 results at 10 a.m. Eastern Time (9 a.m. Central Time) on Tuesday, Feb. 20, 2018. The conference call may be accessed via the Navigant website (investors.navigant.com) or by dialing 888.455.9733 (630.395.0358 for international callers) and referencing pass code “NCI.” An archived version of the webcast will also be available via the Navigant website. A report of financial and related supplemental information is also available via the Navigant website.

DEFINITIONS

ABOUT NAVIGANT

Navigant Consulting, Inc. (NYSE: NCI) (“the Company”) is a specialized, global professional services firm that helps clients take control of their future. Navigant’s professionals apply deep industry knowledge, substantive technical expertise, and an enterprising approach to help clients build, manage, and/or protect their business interests. With a focus on markets and clients facing transformational change and significant regulatory or legal pressures, the firm primarily serves clients in the healthcare, energy, and financial services industries. Across a range of advisory, consulting, outsourcing, and technology/analytics services, Navigant’s practitioners bring sharp insight that pinpoints opportunities and delivers powerful results. More information about Navigant can be found at navigant.com.

Statements included in this press release which are not historical in nature are forward-looking statements as defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements may generally be identified by words such as “anticipate,” “believe,” “may,” “could,” “intend,” “estimate,” “expect,” “plan,” “outlook” and similar expressions. These statements are based upon management’s current expectations and speak only as of the date of this press release. The Company cautions readers that there may be events in the future that the Company is not able to accurately predict or control and the information contained in the forward-looking statements is inherently uncertain and subject to a number of risks that could cause actual results to differ materially from those contained in or implied by the forward-looking statements including, without limitation: the execution of the Company’s long-term growth objectives and margin improvement initiatives; risks inherent in international operations, including foreign currency fluctuations; ability to make acquisitions and divestitures; pace, timing and integration of acquisitions and separation of divestitures; operational risks associated with new or expanded service areas, including business process management services; impairments; changes in accounting standards or tax rates, laws or regulations; management of professional staff, including dependence on key personnel, recruiting, retention, attrition and the ability to successfully integrate new consultants into the Company’s practices; utilization rates; conflicts of interest; potential loss of clients or large engagements and the Company’s ability to attract new business; brand equity; competition; accurate pricing of engagements, particularly fixed fee and multi-year engagements; clients’ financial condition and their ability to make payments to the Company; risks inherent with litigation; higher risk client assignments; government contracting; professional liability; information security; the adequacy of our business, financial and information systems and technology;

maintenance of effective internal controls; potential legislative and regulatory changes; continued and sufficient access to capital; compliance with covenants in our credit agreement; interest rate risk; and market and general economic and political conditions. Further information on these and other potential factors that could affect the Company’s financial results are included under the “Risk Factors” section of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016, and elsewhere in the Company’s filings with the Securities and Exchange Commission (SEC), which are available on the SEC’s website or at investors.navigant.com. The Company cannot guarantee any future results, levels of activity, performance or achievement and undertakes no obligation to update any of its forward-looking statements.

###

NAVIGANT CONSULTING, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share data(1))

(Unaudited)

NAVIGANT CONSULTING, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS AND SELECTED DATA

(In thousands, except DSO data)

NAVIGANT CONSULTING, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

NAVIGANT CONSULTING, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(In thousands, except per share data and percentages)

(Unaudited)

This press release includes certain non-GAAP financial measures as defined by the Securities and Exchange Commission. Below are the reconciliations of these non-GAAP financial measures to the most directly comparable financial measure calculated and presented in accordance with generally accepted accounting principles (GAAP). This information should be considered as supplemental in nature and not as a substitute for, or superior to, any measure of performance prepared in accordance with GAAP. Management uses these non-GAAP financial measures in addition to GAAP financial measures to assess the Company’s operations and financial results and believes they are useful indicators of operating performance and the Company’s ability to generate cash flows from operations that are available for interest, debt service, taxes and capital expenditures. Investors should recognize that these non-GAAP financial measures may not be comparable to similarly-titled measures of other companies.

EBITDA, Adjusted EBITDA, Adjusted Net Income and Adjusted Earnings Per Share (2)

Footnotes