You won't "get" anything on UA from Points Boost. That's not how it works. If you want to book award flights on UA, transferring your UR points to United's program is probably the best (and simplest) option (there are other ways, but they may require more effort/cost). But getting flights on United are (generally) not what "Points Boost" has been about or will be about (for most folks).

"Points Boost" is disingenuous spin, marketingspeak, double-talk, intended to confuse and trick you. At best, it's obfuscation and a misdirection (you know, Marketing); at its worst, it's a classic Orwellian corruption of language to imply a meaning which is the polar opposite of what's actually true. Pay attention...

The following applies to redeeming Chase Ultimate Rewards Points for flights or hotels, through Chase's "Travel Portal." If you are trying to book AWARD flights, it's worth noting that one almost always gets a far better value by transferring points to a partner airline and booking an award flight directly with the airline. But there are many cases where that's just not an option (eg: the flight you want is not available that way - something familiar to anyone who has ever tried to use points for a flight) - so as a fallback, you might use the Chase Travel Portal, though often not getting great value. Or maybe you are trying to book a flight on an airline that has no award flights ever (they do exist).

When you redeem Chase UR points for flights or hotels through Chase's travel portal, by default the points got no "bonus" - it is a simple one-to-one exchange converting points to cash. (You could also pay with real money, but IME, only a fool would do that, because prices on Chase's travel portal tend to be high...I've never seen a case where you could not find a better price by just paying in cash if booking directly with the airline or hotel property). So if you have the points and don't mind using them at a less-than-great value, you could pay with your points, and get what you want, paying with points, even with zero added bonus. But...

If you have (had) a Chase Sapphire Preferred card, your points get (got) a 1.25 bonus when using them at the Chase Travel Portal. A nice "boost" if you want to use today's markingspeak.
If you have (had) a Chase Sapphire Reserve card, your points get (got) a 1.5 bonus when using them at the Chase Travel Portal. A significant "boost" and making it an attractive and important benefit to cardholders.
When paying with your points, you were still exchanging points for the cash price of a flight or hotel stay, but you were getting a 1.25% or 1.5% "boost" increasing the value of your points. All the time.

Now, Chase is taking away the existing 1.25X and 1.5X "boosts". Instead, they say you MIGHT get a "points boost" of UP TO 2X. Note the language. "Up to" means maybe zero, maybe something greater than zero, but in no case more than 2X.

You may have more faith in Chase than me. You may believe all kinds of nonsense. But what Chase is doing here is taking away the 1.25X and 1.5X increased value of your points, and in return you get...nothing. The "up to" language means what they decide to discount to you is...up to them, And it could be (probably, almost always will be) nothing.

This is like "dynamic pricing" for award redemptions. With dynamic pricing, the cost of something is whatever the company tells you it is, there and then. Flights and hotels have always had "dynamic pricing" through the Chase travel portal. But now, the value of your currency (Chase Ultimate Rewards points) is also dynamic. Chase will tell you how much your points are worth, and if you get any "boost" or not. I'll leave it to your imagination to guess how often and how much "boost" they're going to give you. But for all intents and purposes, one should expect to get no "points boost" at all (because, why should they make your money more valuable when they don't need to?).

So for anyone with a Sapphire Reserve card, who books flights/hotels through the Chase portal and uses their points for that - those points have just lost 1/3 of their value. That's not nothing. That's a major devaluation.

For those familiar with the cringeworthy phrase "an exciting enhancement to our program" (and what it really means), this is one of those.

Never mind the 800 dollar annual fee and all the silly coupons for fast-food, all the noise and fluttering online in recent days about this card. The big news today is the major devaluation of Ultimate Rewards points.

Chase, of course, doesn't want you to think of the program changes that way. They are floating the promise of getting not just 1.5X but now "up to" 2X boost. They're saying, "Don't worry about losing your 1.5X boost, we're gonna give you 2X boost, and 2X is better than 1.5X, right?!" (well, UP TO 2X). So bloggers are furiously pumping the new program with all their might (of course they are, they work for the credit card companies, they rely on uninformed consumers to sign up for their referral links - without them they couldn't pay their rent). "Points Boost" is their misdirection (you think you're getting 2X? then why not just give us 2X, without the "up to" qualifier?). Fall for it if you really think they're going to be "boosting" your point values a lot. But be sure to check with the Ministry of Truth, too.