There are several airlines that offer affordable flights from the USA to India. The best airline for cheap flights can vary depending on factors such as travel dates, departure city, and availability. Here are some popular airlines known for offering competitive fares on flights between the USA and India:

1. Air India: Air India is the national carrier of India and often offers competitive fares on direct flights between major US cities (such as New York, Chicago, San Francisco, and Washington, D.C.) and Indian destinations like Delhi and Mumbai.
2. Emirates: Emirates, based in Dubai, is known for its extensive global network and competitive fares. They operate flights from various US cities to Indian destinations with a layover in Dubai.
3. Qatar Airways: Qatar Airways is another popular airline with a wide network and competitive pricing. They offer flights from several US cities to Indian destinations, typically with a layover in Doha, Qatar.
4. Etihad Airways: Etihad Airways, the national airline of the United Arab Emirates, provides flights from major US cities to Indian destinations such as Delhi, Mumbai, and Bangalore, usually with a layover in Abu Dhabi.
5. Turkish Airlines: Turkish Airlines is known for its affordability and well-connected routes. They offer flights from various US cities to Indian destinations with a layover in Istanbul, Turkey.
6. Air Canada: Air Canada operates flights from multiple US cities to Indian destinations like Delhi and Mumbai. They often provide competitive fares and convenient connections.

It’s important to note that airline prices can fluctuate depending on factors such as travel dates, demand, and seat availability. It’s recommended to use flight search engines or websites that compare fares across multiple airlines to find the best deals for your specific travel needs. Additionally, consider booking your flights well in advance, being flexible with travel dates, and signing up for airline newsletters or fare alerts to stay informed about promotions or discounted fares.