There are several popular apps and websites that can help you find affordable airline tickets. Here are some of the commonly recommended ones:

1. Skyscanner: Skyscanner is a popular flight search engine that compares prices from various airlines and travel agencies. It allows you to search for the best deals and set price alerts for specific routes.
2. Kayak: Kayak is another well-known travel app that aggregates flight options from multiple sources. It provides flexible search options, including the ability to search for nearby airports and explore different dates to find the most affordable fares.
3. Google Flights: Google Flights is a powerful tool that allows you to search for flights, track prices, and explore flexible date options. It offers a user-friendly interface and can be particularly useful for comparing prices and finding the best deals.
4. Hopper: Hopper uses predictive algorithms to analyze flight prices and provide recommendations on when to book to get the best deals. It offers insights on whether to book now or wait for potential price drops.
5. Momondo: Momondo is a flight search engine that compares prices from various airlines and travel agencies. It offers a straightforward interface and allows you to search for flexible dates to find the most affordable fares.

Remember that prices can vary depending on several factors, including travel dates, destination, and demand. It’s advisable to compare prices across multiple platforms and be flexible with your travel dates to increase your chances of finding affordable airline tickets. Additionally, it’s always a good idea to book directly through the airline’s official website to ensure reliability and avoid potential issues.