It is possible to watch Dallas Cowboys games live online or on TV without an expensive Cable TV package. Usually these games are on FOX, but that may change depending on schedule, type of game or national interest.
If the game is on either CBS, NBC, FOX or ABC, you can likely watch it live free if you have an inexpensive device called a digital TV antenna. A TV antenna allows you to watch your local broadcast channels for free once you've bought the antenna. This however requires your home to be within range of the local station that is carrying the game.
While using an over-the-air TV antenna is still the best way to freely watch most NFL games, if the Dallas Cowboys game is on ESPN, NFL Network or is blacked out for attendance reasons, you can still watch it, albeit with a little bit of work involved.
If you are looking to stream NFL games online using one of their official apps, you have a few options: NFL Gamepass and NFL Sunday Ticket
If the NFL attempts to blackout live streaming of Dallas Cowboys games due to you being within the their home viewing area, use a VPN to get around it.