Also, you will hear a lot about it being difficult to get an award seat. If you are flexible, you will have a greater chance. Don't take no for a final answer. If you try in March for a flight in July, you may find that none are available. But it is possible that a couple will open up in late June - so continually check. Also, United miles can be used for Delta flights - so if United has no award seats, try for Delta.

And - even if you get a United Visa, get a Delta Amex too - and get 10,000 Delta bonus miles even if you cancel the card after a few months.