D&D 5E Speed buffs and Fly

[Ovinomancer]

Yes. Haste doubles your speed, in all forms.

No. Haste doubles your speed, not special movement speeds. This is a bit confusing and one of the not-natural-language things, bur reread the movement section of the rules. "Speed" is specifically walking. Flying is a special movement form.

 

[Ancalagon]

Interestingly, the winged boots appear to work differently than the fly spell. I would rule that in those cases flying speed would be increased...

 

[DND_Reborn]

No. Haste doubles your speed, not special movement speeds. This is a bit confusing and one of the not-natural-language things, bur reread the movement section of the rules. "Speed" is specifically walking. Flying is a special movement form.

Except if something swims, flies, or climbs normally, Haste affects all of those as well.

While you might think of Fly as a special movement form, it isn't included in the PHB under Special Types of Movement, which only covers Climbing, Swimming, Crawling, and Jumping.

A better argument against Haste affecting Fly is this:

General Rule: Haste doubles speed of the target. The target's speed could be walking, swimming, etc.
Specific Rule: Fly grants you a Flying Speed of 60.

However, this is all interpretation of the rules, and a table could go either direction IMO. Personally, I would be fine with either ruling.

Consider something like a Pegasus, with a Flying speed 90. Haste would make that 180, which is pretty fast (about 41 mph with move + dash).

 

[FreeTheSlaves]

PHB pg190 refers to speed as a measurement of a combination of walking, swimming, climbing and jumping. No reference to flying...

I think we've hit a rule with legitimate arguments both ways.
1) Plain reading adds bonus speed on all modes. The omission of flight on pg190 simply reflects that no PHB race can fly.
2) PHB pg190 limits movement to 4 modes only. Spells like Fly are a stand alone exception, the basis being the specific rule trumps the general rule.