By Saumya Vaishampayan 

U.S. stocks rose on Wednesday, boosted by earnings from Intel Corp. and Delta Air Lines Inc.

The Dow Jones Industrial Average advanced 56 points, or 0.3%, to 18094. The S&P 500 rose nine points, or 0.4%, to 2105, and the Nasdaq Composite Index added 18 points, or 0.4%, to 4996.

Traders said stock-market volumes were higher than in recent sessions because of activity around earnings, though levels remained subdued.

Energy stocks in the S&P 500 rose 1.6%, notching the biggest sector gain as the price of oil continued to rise. Crude-oil futures rose 3.5% to $55.13 a barrel.

A handful of earnings boosted stocks. Delta said earnings in its March quarter more than tripled, beating analyst expectations as the company benefited from lower fuel prices. The airline said it would reduce international capacity by 3% as it deals with the strong dollar. Shares rose 3.3%.

Intel led the Dow higher, up 4.2%. The chip maker late Tuesday reported a 3% rise in net income on overall revenue that was flat compared with the year-ago period. Intel said last month that revenue would suffer in the first quarter due to sagging sales of personal computers. A bright spot was the data center group, which posted a 19% jump in revenue.

Updates on monetary policy in Europe added to the positive tone. The European Central Bank kept rates unchanged, as expected, leaving its main lending rate at a record low. ECB President Mario Draghi emphasized the central bank remains committed to its bond-buying program. France's CAC 40 rose 0.7% and Germany's DAX added 0.1%.

"Central banks across the board still look like they're going to stay very accommodative and keep interest rates low for a long time, which equity investors like," said Chris Gaffney, president of EverBank World Markets.

U.S. stocks rose Tuesday, with the Dow adding 0.3% to 18036.70. The S&P gained 0.2% to 2095.84. With Tuesday's gains, the Dow is now 1.4% away from its all-time high of 18288.63 and the S&P is 1% below its record of 2117.39.

In economic news, U.S. industrial output fell in March and posted the first quarterly decline since the recession ended. The Federal Reserve said industrial production fell 0.6% from the prior month. Economists surveyed by The Wall Street Journal had expected a 0.4% decline in industrial production.

Many investors say the next catalyst for the stock market will come from first-quarter earnings. Expectations were slashed going into the reporting season as companies contended with the strong dollar and low oil prices in the period.

Paul Karos, senior portfolio manager at Whitebox Mutual Funds, which manages about $900 million, said he bought airline stocks earlier this year as they should benefit from low oil prices. "They have the clearest cost benefit [from low oil prices] of anybody in transports," he said. Even with oil prices rebounding in recent sessions, those prices are still down nearly 50% since last June. "That's a huge windfall for the industry," he added.

Gold futures added 0.2% to $1195.00 an ounce. The yield on the 10-year Treasury note fell to 1.880%, compared with 1.904% on Tuesday. Yields fall as prices rise.

In other corporate news, European Union regulators formally accused Google Inc. of violating antitrust laws. Shares fell 1.1%.

Bank of America Corp. said Wednesday it swung to a first-quarter profit. Still, results missed analyst expectations, pushing shares down 0.6%.

Write to Saumya Vaishampayan at saumya.vaishampayan@wsj.com

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