Usually just asking a flight attendant for an upgrade won't work, but there are a couple of cases where your chances largely increase. If economy class has been overbooked and there are seats in business, make sure you're quick to offer (this helps when you're sitting in the first couple of rows).

Yes, you can absolutely ask for a Business Class upgrade, but the success of "just asking" at the counter has evolved significantly by 2026. While the myth of getting a free upgrade by "dressing well" is largely dead due to automated loyalty systems, you can politely ask a check-in agent for "paid upgrades" or "last-minute specials." Often, if the cabin is not full, airlines will offer a significantly discounted cash upgrade that is much cheaper than the original fare. Another effective 2026 strategy is to ask about "Operational Upgrades"—if the economy cabin is overbooked, agents might move passengers up. Always be polite; a friendly, "If the flight is full and you need someone to move up to Business, I'm happy to volunteer," is the most professional approach. However, for a guaranteed seat, most travelers now use the airline's app to "bid" on an upgrade or use miles in the 24 hours leading up to the flight.