Exhibit 99.1

CARNIVAL CORPORATION & PLC REPORTS THIRD QUARTER EARNINGS

WHICH MARKS THE COMPANY’S STRONGEST QUARTERLY NON-GAAP

PERFORMANCE ON RECORD

MIAMI (September 22, 2015) – Carnival Corporation & plc (NYSE/LSE: CCL; NYSE: CUK) announced non-GAAP net income of $1.4 billion, or $1.75 diluted EPS for the third quarter of 2015 compared to non-GAAP net income for the third quarter of 2014 of $1.2 billion, or $1.58 diluted EPS. For the third quarter of 2015, U.S. GAAP net income, which included unrealized losses on fuel derivatives of $137 million, was $1.2 billion, or $1.56 diluted EPS down slightly from the prior year. For the third quarter of 2014, U.S. GAAP net income, which included net unrealized gains on fuel derivatives of $15 million, was $1.2 billion, or $1.60 diluted EPS. Revenues for the third quarter of 2015 were $4.9 billion, in line with the prior year.

Carnival Corporation & plc President and Chief Executive Officer Arnold Donald noted, “Our third quarter non-GAAP performance was the strongest of any quarter on record with earnings $0.17 per share higher than the prior year despite a slight drag from the net impact of fuel prices and currency. Non-GAAP earnings for the quarter were also $0.17 higher than the mid-point of prior guidance. Net revenue yields improved 5 percent (constant currency) from the prior year benefiting from strong demand which led to higher occupancy levels, increased ticket prices and increased onboard spending. Clearly our ongoing investments in the guest experience, combined with our global marketing and public relations efforts along with our initiatives to leverage our scale are having a positive impact.”

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

Other highlights during the third quarter included Princess Cruises’ announcement that the Golden Princess will begin sailing out of Tianjin, China on a seasonal basis starting in 2016, which totals six Carnival Corporation vessels based in China, the largest capacity commitment from any cruise company. Additionally, it was announced in July that two vessels in the four-ship newbuild contract with Meyer Werft shipyard will be earmarked for Costa Cruises and will be the largest ships ever built based on guest capacity. Like the two previously announced AIDA Cruises ships that will also be constructed by Meyer Werft, the Costa ships will be powered at sea by Liquefied Natural Gas, the world’s cleanest burning fossil fuel. Last week, Carnival Corporation announced its new sustainability goals, which include a further reduction in CO₂ emissions of 25 percent by 2020 from the company’s 2005 baseline, along with a fleetwide reduction in shipboard waste generation and improved water usage.

Outlook

Based on the strength in third quarter net revenue yields and current booking trends, the company has increased its expectations for full year 2015 net revenue yields. The company now expects revenue yields to be up approximately 4 percent compared to the prior year versus previous guidance of up 3 to 4 percent on a constant currency basis, which excludes translational and transactional currency impacts (up approximately 3 percent on a constant dollar basis). The company continues to expect full year 2015 net cruise costs excluding fuel per ALBD to be up approximately 3.5 percent compared to the prior year on a constant currency basis (up approximately 3 percent on a constant dollar basis).

Taking the above factors into consideration, the company has increased its full year 2015 non-GAAP diluted earnings per share guidance to be in the range of $2.56 to $2.60, better than both the June guidance range of $2.35 to $2.50 and 2014 non-GAAP diluted earnings of $1.93 per share.

Donald stated, “In 2015, we are on track to achieve a nearly 35 percent earnings improvement and we are accelerating progress toward achieving double digit return on invested capital in the next three to four years. Our improved performance has driven even stronger operating cash, which is expected to exceed $4 billion this year. We remain committed to further enhancing shareholder returns as demonstrated by our recent 20 percent increase in quarterly dividends.”

During the last quarter, fleetwide booking volumes for the first half of 2016 were running nearly 20 percent higher than the prior year relative to a capacity increase of less than 3 percent, at lower constant dollar prices. At this time, cumulative advance bookings for the first half of 2016 are well ahead of last year at lower constant dollar prices.

Donald added, “Looking forward to 2016, we have driven a significant lengthening of the booking curve and have less inventory remaining for the first half of 2016 than at this time last year, which bodes well for continued year-over-year revenue yield improvement. Although we already have a solid base of business for next year, we are working hard to maintain the momentum through our ongoing initiatives to create additional demand.”

Fourth Quarter 2015 Outlook

Fourth quarter constant currency net revenue yields are expected to be up approximately 3 percent compared to the prior year (up approximately 1 percent in constant dollars). Net cruise costs excluding fuel per ALBD for the fourth quarter are expected to be higher by approximately 3 percent on a constant currency basis compared to the prior year (up approximately 2 percent in constant dollars).

Based on the above factors, the company expects non-GAAP diluted earnings for the fourth quarter 2015 to be in the range of $0.36 to $0.40 per share versus 2014 non-GAAP earnings of $0.27 per share.

Selected Key Forecast Metrics

Conference Call

The company has scheduled a conference call with analysts at 10:00 a.m. EDT (3:00 p.m. BST) today to discuss its 2015 third quarter 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, Holland America Line, Princess Cruises, Seabourn, AIDA Cruises, Costa Cruises, Cunard, P&O Cruises (Australia), P&O Cruises (UK) and Fathom.

Together, these brands will operate 100 ships in 2015 totaling 219,000 lower berths with 17 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&P 500 and the FTSE 100 indices.

Additional information can be found on www.carnival.com, www.hollandamerica.com, www.princess.com, www.seabourn.com, www.aida.de, www.costacruise.com, www.cunard.com, www.pocruises.com.au, www.pocruises.com and www.fathom.org.

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 non-GAAP 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 INCOME

(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):

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)

Non-GAAP 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 the quantitative reconciliations of forecasted gross cruise revenues to forecasted net cruise revenues or forecasted gross cruise costs to forecasted net cruise costs would include a significant amount of uncertainty in projecting the costs deducted to arrive at these measures. As such, management does not believe that this reconciling information would be meaningful.

In addition, because our Europe, Australia & Asia (“EAA”) cruise brands utilize the euro, sterling and Australian dollar as their functional currency to measure their results and financial condition, the translation of those operations to our U.S. dollar reporting currency results in decreases in reported U.S. dollar revenues and expenses if the U.S. dollar strengthens against these foreign currencies and increases in reported U.S. dollar revenues and expenses if the U.S. dollar weakens against these foreign currencies. Accordingly, we also monitor and report these non-GAAP financial measures assuming the 2015 periods’ currency exchange rates have remained constant with the 2014 periods’ rates, or on a “constant dollar basis,” in order to remove the impact of changes in exchange rates on the translation of our EAA brands. We believe that this is a useful measure since it facilitates a comparative view of the changes in our business in a fluctuating currency exchange rate environment.

Although our constant dollar basis measure removes the foreign currency translational impact as discussed above, it does not remove the foreign currency transactional impact from changes in exchange rates on our brands’ revenues and expenses that are denominated in a currency other than their functional currency. Historically the foreign currency transactional impact had not been significant when measuring the periodic changes in our results of operations. However, given the continuing expansion of our global business and the heightened volatility in foreign currency exchange rates, we believe the foreign currency transactional impact is more significant in measuring our 2015 results compared to 2014, than in previous years. Together, the foreign currency translational and transactional impacts discussed above are referred to as on the “constant currency basis.”

We have not included in our earnings guidance the impact of unrealized gains and losses on fuel derivatives because these unrealized amounts involve a significant amount of uncertainty, and we do not believe they are an indication of our future earnings performance. Accordingly, our earnings guidance is presented on a non-GAAP basis only. As a result, we did not present a reconciliation between forecasted non-GAAP diluted earnings per share guidance and forecasted U.S. GAAP diluted earnings per share guidance, since we do not believe that the reconciliation information would be meaningful. 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.