The Travel Credits of United Airlines are generally given after a cancelled flight or as part of compensation for certain inconveniences. To use your credit points, you can start by logging into your United account on the airline's official website. When booking a flight, you can have the option to apply the credit to your total price during checkout. United Airlines Travel Credits are usually valid for up to 1 year from the original issuance date, so make sure to use them before they expire. Keep in mind that the credit points can only be applied to the immediate passenger and is non-transferable.