Exhibit 99.1

CARNIVAL CORPORATION & PLC REPORTS

A 40 PERCENT INCREASE IN FULL YEAR EARNINGS

MIAMI (December 18, 2015) – Carnival Corporation & plc (NYSE/LSE: CCL; NYSE: CUK) announced adjusted net income for the full year 2015 of $2.1 billion, or $2.70 diluted EPS, compared to $1.5 billion, or $1.93 diluted EPS, for the prior year. Full year 2015 U.S. GAAP net income was $1.8 billion, or $2.26 diluted EPS, which included unrealized losses (non-cash) on fuel derivatives of $332 million and other net charges of $17 million. Full year 2014 U.S. GAAP net income was $1.2 billion, or $1.56 diluted EPS, which included unrealized losses (non-cash) on fuel derivatives of $268 million and other net charges of $20 million. Revenues for the full year 2015 were $15.7 billion compared to $15.9 billion for the prior year due to the unfavorable impact from currency exchange rates of over $800 million.

Carnival Corporation & plc President and Chief Executive Officer Arnold Donald noted, “We nearly doubled our fourth quarter results and ended the year with 40 percent higher earnings. Strong operational execution delivered $0.25 per share higher earnings than the mid-point of our full year 2015 December guidance, despite a $0.10 drag from the net impact of currency and fuel prices. This year we achieved a 4.3 percent improvement (constant currency) in revenue yields compared to the prior year due to higher onboard revenues and increased ticket prices as we have driven demand in excess of capacity growth, while our ongoing efforts to leverage our industry-leading scale helped to contain costs. Our strong performance led to record operating cash flow of well over $4 billion versus $3.4 billion last year,” Donald stated.

Key metrics for the fourth quarter 2015 compared to the prior year were as follows:

Highlights during the fourth quarter included the grand opening of Amber Cove, a new Carnival Corporation cruise facility on the northern coast of the Dominican Republic, and the launch of P&O Cruises (Australia’s) Pacific Aria and Pacific Eden, which have been impeccably appointed to suit Australian guests. In October, Carnival Cruise Line and AIDA Cruises announced they will each enter the China market in 2017 with a second Carnival Cruise Line ship to be positioned there in 2018. In 2016, there is already a combined fleet of six ships from the Costa Cruises and Princess Cruises brands scheduled to operate in China. Also, Princess Cruises will introduce the Majestic Princess to the Chinese market in 2017. That ship is currently under construction and will be the first vessel built specifically for Chinese guests incorporating a unique blend of international and Chinese features. Carnival Corporation also recently announced the formation of a joint venture with the China State Shipbuilding Corporation and the China Investment Corporation aimed at accelerating the development and growth of the overall cruise industry in China including the planned launch of the first world-class, multi-ship domestic cruise brand in the Chinese market. These latest developments further strengthen the company’s leading position in China, which is expected to, over time, surpass North America as the world’s largest cruising region.

2016 Outlook

At this time, cumulative advance bookings for the first three quarters of 2016 are well ahead of the prior year at slightly higher constant currency prices. Since September, booking volumes for the first three quarters of 2016 are in line with last year’s levels at higher prices.

Donald noted, “As we had anticipated, with less inventory remaining for sale, we have begun to sell at higher prices than the same time last year, particularly close to departure, affirming our expectation of continued yield improvement in 2016.”

Based on current booking trends, the company forecasts full year 2016 net revenue yields in constant currency to be up approximately 3 percent compared to the prior year, of which approximately 1 percent is due to an accounting reclassification for the Europe, Australia and Asia segment. The company expects net cruise costs excluding fuel per ALBD in constant currency for full year 2016 to be up approximately 2 percent, of which approximately 1.5 percent is also due to the reclassification. The reclassification has no impact on operating income.

Current currency exchange rates and fuel prices, net of fuel derivatives, are $0.22 per share favorable compared to the prior year. Taking the above factors into consideration, the company forecasts full year 2016 adjusted earnings per share to be in the range of $3.10 to $3.40, compared to 2015 adjusted earnings of $2.70 per share.

Looking forward, Donald stated, “We have accelerated progress toward and remain well positioned to achieve our double digit return on invested capital threshold in the next two to three years. Over time, we expect to continue to return excess cash to shareholders as demonstrated by our recent 20 percent increase in quarterly dividends and more than $400 million in share repurchases.”

Donald also noted that four new ships are scheduled to enter service for Carnival Corporation brands in 2016. Holland America Line’s Koningsdam and AIDAprima will debut in April, Carnival Vista will enter service in May, and Seabourn Encore in December. Each vessel has a wide variety of exciting and innovative new features that will generate consumer buzz for those brands.

First Quarter 2016 Outlook

First quarter constant currency net revenue yields are expected to be up 3.5 to 4.5 percent compared to the prior year. Net cruise costs excluding fuel per ALBD for the first quarter are expected to be 2.5 to 3.5 percent higher in constant currency compared to the prior year. Based on the above factors, the company expects adjusted earnings for the first quarter 2016 to be in the range of $0.28 to $0.32 per share, compared to 2015 adjusted earnings of $0.20 per share.

Selected Key Forecast Metrics

Conference Call

The company has scheduled a conference call with analysts at 10:00 a.m. EST (3:00 p.m. GMT) today to discuss its 2015 fourth quarter and full year results. This call can be listened to live, and additional information can be obtained, via Carnival Corporation & plc’s Web site at www.carnivalcorp.com and www.carnivalplc.com.

Carnival Corporation & plc is the largest cruise company in the world, with a portfolio of 10 cruise brands in North America, Europe, Australia and Asia, comprised of Carnival Cruise Line, Fathom, Holland America Line, Princess Cruises, Seabourn, AIDA Cruises, Costa Cruises, Cunard, P&O Cruises (Australia) and P&O Cruises (UK).

Together, these brands operate 99 ships totaling 216,000 lower berths with 18 new ships scheduled to be delivered between 2016 and 2022. Carnival Corporation & plc also operates Holland America Princess Alaska Tours, the leading tour companies in Alaska and the Canadian Yukon. Traded on both the New York and London Stock Exchanges, Carnival Corporation & plc is the only group in the world to be included in both the S&P500 and the FTSE 100 indices. Additional information can be found on www.carnival.com, www.fathom.org, www.hollandamerica.com, www.princess.com, www.seabourn.com, www.aida.de, www.costacruise.com, www.cunard.com, www.pocruises.com.au, and www.pocruises.com.

Cautionary Note Concerning Factors That May Affect Future Results

Carnival Corporation and Carnival plc and their respective subsidiaries are referred to collectively in this release as “Carnival Corporation & plc,” “our,” “us” and “we.” Some of the statements, estimates or projections contained in this release are “forward-looking statements” that involve risks, uncertainties and assumptions with respect to us, including some statements concerning future results, outlooks, plans, goals and other events which have not yet occurred. These statements are intended to qualify for the safe harbors from liability provided by Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical facts are statements that could be deemed forward-looking. These statements are based on current expectations, estimates, forecasts and projections about our business and the industry in which we operate and the beliefs and assumptions of our management. We have tried, whenever possible, to identify these statements by using words like “will,” “may,” “could,” “should,” “would,” “believe,” “depends,” “expect,” “goal,” “anticipate,” “forecast,” “project,” “future,” “intend,” “plan,” “estimate,” “target,” “indicate” and similar expressions of future intent or the negative of such terms.

Forward-looking statements include those statements that may impact, among other things, the forecasting of our adjusted earnings per share; net revenue yields; booking levels; pricing; occupancy; operating, financing and tax costs, including fuel expenses; net cruise costs per available lower berth day; estimates of ship depreciable lives and residual values; liquidity; goodwill, ship and trademark fair values and outlook. Because forward-looking statements involve risks and uncertainties, there are many factors that could cause our actual results, performance or achievements to differ materially from those expressed or implied in this release. This note contains important cautionary statements of the known factors that we consider could materially affect the accuracy of our forward-looking statements and adversely affect our business, results of operations and financial position. It is not possible to predict or identify all such risks. There may be additional risks that we consider immaterial or which are unknown. These factors include, but are not limited to, the following:

Forward-looking statements should not be relied upon as a prediction of actual results. Subject to any continuing obligations under applicable law or any relevant stock exchange rules, we expressly disclaim any obligation to disseminate, after the date of this release, any updates or revisions to any such forward-looking statements to reflect any change in expectations or events, conditions or circumstances on which any such statements are based.

CARNIVAL CORPORATION & PLC

CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)

(in millions, except per share data)

CARNIVAL CORPORATION & PLC

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

(in millions, except par values)

CARNIVAL CORPORATION & PLC

OTHER INFORMATION

Notes to Statistical Information

CARNIVAL CORPORATION & PLC

NON-GAAP FINANCIAL MEASURES

Consolidated gross and net revenue yields were computed by dividing the gross and net cruise revenues by ALBDs as follows (dollars in millions, except yields) (a) (b):

(See Notes to Non-GAAP Financial Measures.)

CARNIVAL CORPORATION & PLC

NON-GAAP FINANCIAL MEASURES (CONTINUED)

Consolidated gross and net cruise costs and net cruise costs excluding fuel per ALBD were computed by dividing the gross and net cruise costs and net cruise costs excluding fuel by ALBDs as follows (dollars in millions, except costs per ALBD) (a) (b):

(See next page for Notes to Non-GAAP Financial Measures.)

CARNIVAL CORPORATION & PLC

NON-GAAP FINANCIAL MEASURES (CONTINUED)

Adjusted fully diluted earnings per share was computed as follows (in millions, except per share data) (b):

Notes to Non-GAAP Financial Measures

Net revenue yields are commonly used in the cruise industry to measure a company’s cruise segment revenue performance and for revenue management purposes. We use “net cruise revenues” rather than “gross cruise revenues” to calculate net revenue yields. We believe that net cruise revenues is a more meaningful measure in determining revenue yield than gross cruise revenues because it reflects the cruise revenues earned net of our most significant variable costs, which are travel agent commissions, cost of air and other transportation, certain other costs that are directly associated with onboard and other revenues and credit and debit card fees. Substantially all of our remaining cruise costs are largely fixed, except for the impact of changing prices and food expenses, once our ship capacity levels have been determined.

Net passenger ticket revenues reflect gross passenger ticket revenues, net of commissions, transportation and other costs. Net onboard and other revenues reflect gross onboard and other revenues, net of onboard and other cruise costs. Net passenger ticket revenue yields and net onboard and other revenue yields are computed by dividing net passenger ticket revenues and net onboard and other revenues by ALBDs.

Net cruise costs per ALBD and net cruise costs excluding fuel per ALBD are the most significant measures we use to monitor our ability to control our cruise segments’ costs rather than gross cruise costs per ALBD. We exclude the same variable costs that are included in the calculation of net cruise revenues to calculate net cruise costs with and without fuel to avoid duplicating these variable costs in our non-GAAP financial measures. In addition, we exclude gains and losses on ship sales and ship impairments, net and restructuring expenses from our calculation of net cruise costs with and without fuel as they are not considered part of our core operating business.

As a result of our revision of 2014 cruise ship operating expenses, our previously reported results changed as follows (in millions, except per ALBD data):

CARNIVAL CORPORATION & PLC

NON-GAAP FINANCIAL MEASURES (CONTINUED)

We have not provided estimates of future gross revenue yields or future gross cruise costs per ALBD because it would be too difficult to prepare a reliable U.S. GAAP quantitative reconciliations of forecasted gross cruise revenues to forecasted net cruise revenues or forecasted gross cruise costs to forecasted net cruise costs without unreasonable efforts. As such, management has not provided this reconciling information.

In addition, our Europe, Australia & Asia (“EAA”) cruise brands utilize the euro, sterling and Australian dollar as their functional currency, the monetary unit of the primary economic environment in which they operate, to measure their results and financial condition. This subjects us to foreign currency translational risk. All of our North American (“NA”) and EAA cruise brands also have revenues and expenses that are in a currency other than their functional currency. This subjects us to foreign currency transactional risk.

We report non-GAAP financial measures on a “constant dollar” and “constant currency” basis assuming the 2015 periods’ currency exchange rates have remained constant with the 2014 periods’ rates. These metrics facilitate a comparative view for the changes in our business in an environment with fluctuating exchange rates.

Constant dollar reporting is a Non-GAAP financial measure that removes only the impact of changes in exchange rates on the translation of our EAA brands.

Constant currency reporting is a Non-GAAP financial measure that removes the impact of changes in exchange rates on the translation of our EAA brands (as in constant dollar) plus the transactional impact of changes in exchange rates from revenues and expenses that are denominated in a currency other than the functional currency for both our NA and EAA brands.

Examples:

Our foreign currency transactional impact is more significant to our 2015 results compared to 2014 given the continuing expansion of our global business and the heightened volatility in foreign currency exchange rates. This differed from previous years when our constant dollar reporting removed substantially all of the impact of changes in currency exchange rates between periods. Accordingly, we also reported on a constant currency basis beginning in 2015.

We have excluded from our earnings guidance the impact of unrealized gains and losses on fuel derivatives because we do not believe they are an indication of our future earnings performance. Accordingly, our earnings guidance is presented on an adjusted basis only. As a result, management has not provided a reconciliation between forecasted adjusted earnings per share guidance and forecasted U.S. GAAP earnings per share guidance because it would be too difficult to prepare a reliable U.S. GAAP quantitative reconciliation without unreasonable effort. However, we do forecast realized gains and losses on fuel derivatives by applying current Brent prices to the derivatives that settle in the forecast period.