1. Book at the Right Time
Timing matters more than you think. For domestic flights, the sweet spot is 1-3 months before departure. For international, aim for 2-8 months. According to Google Flights data, prices are lowest 21-60 days out for domestic and 50-100 days for international. Avoid booking last-minute unless you're flexible. Also, Tuesday and Wednesday departures are often cheaper than Friday or Sunday. I saved $120 on a round-trip to Denver by flying out on a Tuesday instead of Friday.
2. Use the Right Tools
Google Flights is my go-to for quick comparisons. Its calendar view shows the cheapest days to fly. Skyscanner is great for 'everywhere' searches if you're flexible on destination. For mistake fares and error fares, follow Secret Flying and Scott's Cheap Flights (now Going). I've snagged a $250 round-trip to Europe thanks to a Secret Flying alert. Set alerts on Google Flights for specific routes and dates—you'll get email notifications when prices drop.
3. Be Flexible with Airports
Don't limit yourself to one airport. In major cities, check all nearby airports. For example, flying into Newark (EWR) instead of JFK can save you $50-$100 on a domestic flight. In Europe, consider secondary airports like Beauvais (BVA) for Paris or Charleroi (CRL) for Brussels. Use Google Flights' '附近' feature to see nearby airports. Just factor in transportation costs to the city center—sometimes the savings are wiped out by a $30 train ride.
4. Fly on Off-Peak Days
Tuesday, Wednesday, and Saturday are typically the cheapest days to fly. Friday and Sunday are the most expensive. A study by Expedia found that flying on a Tuesday can save you up to 20% compared to Friday. If you can't avoid weekend travel, consider red-eye flights—they're often cheaper and you save on a hotel night. I once flew from LA to NYC on a Wednesday red-eye for $99 one-way, while Friday afternoon flights were $250+.
5. Clear Your Cookies (or Use Incognito)
There's debate about whether airlines track your searches, but it doesn't hurt to use incognito mode or clear your cookies. Some travelers report seeing prices increase after multiple searches. I always search in incognito and use a VPN if I'm checking prices from different countries. For example, a flight from Bangkok to London might be cheaper when booked on the Thai version of the airline's site. Just be careful—some airlines require a local credit card.
6. Consider Budget Airlines (But Read the Fine Print)
Budget carriers like Ryanair, EasyJet, and Spirit can save you big—if you pack light and follow the rules. A $30 fare can become $100 with a carry-on bag and seat selection. Always compare the total cost, including baggage and fees, against a full-service airline. I flew Ryanair from London to Dublin for £15, but paid £40 for a checked bag. Still cheaper than BA's £120 fare, but do the math.
7. Use Points and Miles
If you have travel credit cards, use points for flights. Transfer partners like Chase Ultimate Rewards and Amex Membership Rewards can get you outsized value. For example, 25,000 Chase points can be worth $375 toward travel via the portal, or transfer to United for a round-trip domestic flight. I booked a $600 flight to Hawaii for 35,000 Amex points transferred to British Airways Avios. Check award availability on seats.aero before transferring points.