Chase Ultimate Rewards is the only major U.S. credit card rewards program that is a direct transfer partner of United MileagePlus. Ultimate Rewards points can be transferred to United at a 1:1 ratio.
Conversion Rate
Ultimate Rewards points can be transferred to United at a 1:1 ratio meaning that every 1,000 Chase points you transfer will give you 1,000 United miles. This is an excellent way to build your miles and is a solid transfer partner that can get you about 1.3 cents in value per point for economy flights and even higher value for first and business class flights with United and their airline partners.

You must have at least 1,000 Ultimate Rewards points in order to initiate a transfer to United and you must transfer points in 1,000-point increments.
Conversion Calculator
Use the Conversion Calculator to calculate the transfer of Chase Ultimate Rewards points to United MileagePlus miles.
Other Ways To Earn United Miles
The only other option for earning lots of United miles is by using United's own co-branded credit cards. They offer several credit cards that you can use to earn miles on everyday spending as well as through large intro bonuses.
Here are the co-branded credit cards United offers:
FAQ
Can you transfer Chase Ultimate Rewards points to United?
Yes. Ultimate Rewards points can be transferred to United at a 1:1 ratio.
What is the transfer rate for Chase points to United miles?
Every 1,000 Ultimate Rewards points you transfer to United will give you 1,000 United miles.
Is it worth it to transfer Chase points to United?
Yes. Transferring points to United MileagePlus can offer some solid value.