For me, flying in business or first class is not about the extra attentive service or the meals, or even about the endless supply of free booze (well, maybe a little).
It's about comfort, especially on long-haul flights. It's about being able to shift position, with the push of a button or two, from sitting upright to a much more comfortable lie-flat position. That's when my spine and posterior go "aaaah."
But airborne comfort comes at a cost. So I'll tell you how to fly flat for less than you might imagine.
1. Buy a nonrefundable business or first-class fare when it's low
Airfares change moment to moment and day to day. Search for a nonstop one-way in business class and the fare could be $499 one minute and $1,999 the next. I check multiple times as far in advance as possible and snag a deal when it appears. It's as easy as hitting the search button again and again to see if fares have changed. Often on domestic routes, nonrefundable business or first-class seats are just twice the cost of economy class rather than three or four times as much, as they once were. As with nonrefundable economy fares, you'll pay $200 to change or cancel.
2. Use miles or points to upgrade
Delta, American, United and others let passengers use miles (15,000 to 20,000) plus a co-pay of $75, on Lower 48 domestic routes, to upgrade from economy. Sometimes an upgrade is available immediately when you call the airline's award desk, but usually you'll be put on a waitlist. How far in advance you book, the price of the economy fare and the time you check in may affect your chances. Upgrades on flights to Hawaii and international destinations will cost more miles and higher co-pays.
3. Use miles or points to book
The number of miles or points needed to book a frequent-flier award seat will also vary day by day. I recommend calling the awards desk. Last year I was looking for business-class award seats on British Airways and found none online, but when I spoke to someone on the phone there were lots of options. That said, American was offering, on its app but not on its website, "online-only" business and first-class awards at greatly reduced mileage, so it's a good idea to try both methods. Check several times before committing.
If you have good credit but don't have enough miles in your account, the fastest way to earn enough for a business-class ticket is to get a new credit card offering sign-up bonuses after you charge a specified amount, usually around $3,000 in the first three months. (Delta's relaunched American Express cards currently offer 70,000 to 100,000 bonus miles.)
But do us all a favor and apply for these cards directly with the issuing bank and not through websites that get millions in referral commissions, since we consumers end up paying for these bounties in the form of higher interest rates and fees. To circumvent those "points" websites, airlines are marketing credit cards onboard flights with added incentives not available online.