Sometimes those low prices are only offered by sketchy third-party booking sites that nobody has ever heard of. High risk of not actually being able to get on the plane, making your 40 hour journey significantly longer than that.

>>2881540
>I want to go to Vietnam from Ohio but all the best deals are within a few days usually
kek
US airlines didn't hedge their kerosene prices
and that's why they don't have any deals as they price in the current variability of fuel prices for future flights

>Also I don't care that these are 40h flights
won't help you here
these only work for stitched together journeys by 3rd party vendors for undesirable, discounted legs

your problem is that no flight leaving from or arriving to the USA will be discounted
so even the 40h options will be barley cheaper

>Just risk it and wait until 3 days before my planned departure to book?
are you flexible with your timing?
because
if you're e.g. a student and can freely move your travel time, I'd risk it and wait
if you're a wagie who has to apply for time off, I'd book now

if kerosene price plummets, flights might get 100-200€ cheaper (for that distance)
but there's no guarantee and you can't predict demand