My favorites are my Max. tenufolia and a Blc (Mello Vista x Goldenzelle) x George King 'Southern Cross' that was one of my first orchids that my mother brought back from Carter and Holmes in SC as a seedling. It smells like lily of the valley and it is just right...not too powerful but just enough that when you get a whiff of it it makes you smile a whole lot.

Not sure if it has been mentioned...
Phal. lueddemanniana PLUS this phal makes several branching spikes. Many blooms, and eventually Keikis! This one fills the whole room. I have P. luedddemanniana 'Woodlawn'
Phal. Krull's Red Hot x violacea 'Dark Blue' This is my favorite fragrance of a phal. It's smell "warm" sweet+spicy .. I can catch a whiff of cinnamon sometimes. Plus each flower lasts over 7 weeks, for me.

My Aerangis fastuosa is blooming, but the scent isn't strong. Once close, it smells like citrus, sweet, and tiger balm? I haven't checked the A. luteo-alba yet.

Many orchids are fragrant, but not strong enough to fill up a room. Some are strong enough to be sensed by being near it, and most of them you have to get right up to it to smell them.

My favorite fragrant orchids that can fill up a room:

Miltoniopsis (some are not scented and some are midly scented, but when you get a good one, then you will know what I mean)
Fragrance can start quite early in the morning but the climax is around midday.
The thing about this plant is that it needs to have specific environmental cues to have the best (strongest) scent. Bright sunny day but not too hot.
So a bit panicky but worth it and it's by far the best thing I have ever smelled!!!

Brassavola nodosa and certain hybrids of it.
These are fragrant at night, starting early evening and reaching the max intensity around midnight.

Neofinetia. Starts to emit fragrance at dusk and continue on till early morning.

Question for NYOrchidman
 

Hi NY,

I am down in Florida and have an Andrea West HOF Milt budding now. I am however very limited to Milt stock down here...Matsui does not even deal to Trader Joe's down here as we are pretty much out of the suitable climate come summer. I am mainly driven by fragrance and paid dearly last year for a Maui Mist Golden Gate that had zero fragrance. What, in your experience brought the most amazing fragrance for Milts....I hear whites like Herr Alexandre? Not having an ability to sniff before purchasing is very frustrating...I am very ready to fly up to NY and hit the shops and have one fly on my lap back to FL...thanks in advance...Blu

My favorites so far with a powerful scent are; Dendrobium kingianum ( scent can fill a small room). Neofinita falcata ( smells mmm mmm mmm good!! at night. Scent can fill a small room), Oncidium twinkle, and my most recent discovery, rhynchostylis retusa! Smells very sweet. I have it hanging above my sink and when I do the dishes in the morning. I get wiffs of its sweet perfume!!
And last but not least and possibley my all time favorite scent is the dendrobium micro-chip. Smells like earl grey tea and vanilla to me. LOVE LOVE LOVE💗

I'm with Plodde, Dendrobium kingianum, (mine is the alba variety), fills the house with scent for up to a month each spring; I'm even allowed to bring it in from the greenhouse for the duration...

Not to forget Bifrenaria harrisoniae and Jumellea sagittata. Stanhopeas like grandiflora are addictive, and I love Anguloa clowesii.

Most of Miltoniopsis I buy are NOID, but I don't care because I buy them in bloom and then toss. lol
I did grow them for a while though in the past. also I do buy named clones as well.

Now, these plants can vary a lot among seed grown hybrids, so I can't say for sure.

I have bought pretty much any color combo available out there (white, white with plum color, red, pink, yellow, and multiple color, waterfall...you name it, I've had it all!!!) and the fragrance has nothing to do with color.
It is totally up to individual plants. Most are very fragrant and some just don't have it.

Now, with the one that are fragrant, they won't be fragrant if kept too warm as I mentioned in my earlier post.

Now, I see Miltoniopsis offered at one particular store on the midtown west. So fly up here now and buy them before too late. :lol:

They don't do well in the heat, hence they are not grown much in the south I guess.

Thanks NYCOrchidman
 

Believe it or not they grow like weeds down here in Florida and a gentleman in Upstate NY...I believe he has Select Orchids that deals strictly with Miltoniopsis...has his Mom growing them in Fort Myers if you could believe it. The only thing is about now they come in when night temps don't fall below 70 degrees and spend the summers in the AC like the rest of us. During Fall, Winter, and Spring they actually thrive down here. My yellow Andrea West is about to pop and am hoping for fragrance from it. Thanks again.