Exhibit 99.1

FOR IMMEDIATE RELEASE

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NAVIGANT REPORTS THIRD QUARTER 2017 FINANCIAL RESULTS

CHICAGO, Oct. 26, 2017 – Navigant (NYSE: NCI) today announced financial results for the quarter ended Sept. 30, 2017.

Third quarter 2017 financial summary and highlights:

“Our third quarter results reflect comparable year-over-year top-line performance and modest sequential improvement,” said Julie Howard, Chairman and CEO of Navigant. “Performance in the quarter was driven by continued growth in our Healthcare segment and positive, sequential momentum from improvements in our Financial Services Advisory and Compliance (FSAC) segment, while tempered by demand-side headwinds in certain other areas of our business. With an expected strong finish from both our Healthcare and FSAC segments, we remain positioned to achieve our full-year 2017 guidance targets.”

Consolidated Results

Navigant reported third quarter 2017 revenue and RBR of $262.3 million and $237.5 million, respectively, both comparable to third quarter 2016. Growth in the Healthcare segment and the benefit of the November 2016 Ecofys acquisition were offset by lower RBR from U.S. Federal Government engagements in the Energy segment, as well as lower revenue in both the FSAC segment and the Disputes, Forensics & Legal Technology segment.

Third quarter 2017 cost of services were higher compared to the third quarter 2016 driven primarily by increased headcount and absorbed costs from the Ecofys acquisition. This drove lower segment operating profit of $78.2 million, compared to $84.0 million in the prior year period. General and administrative expense increased primarily due to higher bad debt expense, including a large, single customer bankruptcy. Excluding bad debt expense, general and administrative expenses were lower in the current year period and represented 16.4% of RBR.

Third quarter 2017 Adjusted EBITDA was $32.9 million, a decrease of 17% from $39.8 million for the same prior year period. Net income for third quarter 2017 was down 30% to $11.9 million driven primarily by the items discussed above. Adjusted EPS was $0.30 for third quarter 2017, compared to $0.37 in third quarter 2016.

Segment Financial Summary

Healthcare segment RBR of $95.9 million increased 5% for third quarter 2017 compared to the same prior year period. Segment RBR for the quarter also increased 2% sequentially from second quarter 2017. Growth was supported by improved performance from existing revenue cycle managed services contracts and increased demand from life sciences clients seeking product commercialization solutions. Segment operating profit of $29.7 million declined 7% in third quarter 2017 compared to the same period in 2016, primarily due to increased headcount in revenue cycle managed services, as well as business mix.

Energy segment RBR increased 4% for third quarter 2017 to $29.6 million compared to the third quarter 2016, driven by contributions from the Ecofys acquisition which closed in November 2016. Offsetting the Ecofys impact was continued depressed demand from U.S. Federal Government engagements. Segment operating profit was relatively flat compared to the prior year period.

Financial Services Advisory and Compliance segment RBR for third quarter 2017 was $38.0 million, a 6% decrease compared to very strong third quarter 2016 performance. RBR increased 13% from second quarter 2017 as demand in financial crime-related services drove strong sequential improvement. Segment operating profit of $15.9 million was down 10% in third quarter 2017 compared to the same period in 2016 due to project mix.

Disputes, Forensics & Legal Technology segment RBR for the third quarter 2017 was $74.0 million, a 4% decrease compared to the prior year period. Reduced processing activities in the legal technology solutions business was only partially offset by strong performance in the global construction practice. Segment operating profit was down $1.6 million in third quarter 2017 compared to third quarter 2016, as lower operating cost across the segment only partially offset the decline in revenue.

Cash Flow

Net cash provided by operating activities for third quarter 2017 was $35.2 million compared to $48.0 million for third quarter 2016. Free Cash Flow decreased to $14.2 million for third quarter 2017 compared to $25.5 million for the same period in 2016, primarily driven by lower profitability and higher capital expenditures. Days Sales Outstanding was 94 days as of Sept. 30, 2017, up 13 days compared to Dec. 31, 2016, as elongated collection experience was further impacted by the migration to a new billing platform.

Navigant repurchased 840,735 shares of common stock during the third quarter 2017 at an aggregate cost of $14.1 million and an average price of $16.72 per share. As of Sept. 30, 2017, the company had $78.6 million remaining under its stock repurchase authorization which expires on Dec. 31, 2019.

2017 Outlook

Navigant affirms its revised 2017 financial outlook, which was previously provided in conjunction with second quarter 2017 earnings. Full year 2017 RBR is expected to range between $955 million and $980 million while 2017 total revenue is estimated to be between $1.04 billion and $1.065 billion. Adjusted EBITDA for the full year 2017 is expected to range between $135 and $145 million and adjusted EPS for the full year 2017 is estimated to be between $1.19 and $1.29.

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 third quarter 2017 results at 10 a.m. Eastern Time (9 a.m. Central Time) on Thursday, October 26, 2017. 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.

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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.

Footnotes