How to use Google Flights to find the cheapest route

Set your origin and destination, toggle flexible dates to see price patterns across a calendar, use the price tracking feature to monitor fares, and filter by stops and airlines to balance cost with convenience. Most people find their cheapest options by being willing to fly mid-week or accepting one connection.

1. Start with flexible dates enabled. Go to Google Flights (google.com/flights). Enter your origin and destination cities. Click the calendar icon and toggle "Flexible dates" on. This shows you a full month view with prices for each day. Look for the darkest blue (cheapest) dates. If you can shift your travel by even 2-3 days, you often save $50-200 per ticket.
2. Check the price graph. Below the calendar, you'll see a price trend graph for the next 6 months. This shows whether fares are historically cheap or expensive right now. If the line is low, book soon. If it's high, wait if you can. The graph tells you the best booking window—usually 1-3 months ahead for domestic, 2-4 months for international.
3. Set up price tracking. After entering your route, click the bell icon to "Track prices." Google will email you when prices drop for your specific route and dates. This is free and requires a Google account. Check your tracking list weekly—prices move fast, and you want to know when a fare dips.
4. Filter by stops and time. On the left sidebar, use the "Stops" filter. Non-stop flights are usually most expensive. Selecting "1 stop" or "2+ stops" dramatically lowers price, though it adds 2-6 hours to travel time. Also filter "Departure time"—red-eye flights (leaving late evening) and early morning departures are often cheaper than mid-day.
5. Compare airlines and times. Scroll through the results. The same route with different airlines or departure times will vary by $20-100+. Look for airlines you're comfortable with, but don't dismiss budget carriers if you're flexible on baggage and seat selection. Click a flight to see the full itinerary and layover times before booking.
6. Use the explore feature for open-ended trips. If you have a destination in mind but no fixed dates, click "Explore" (or search from a region, not a city). Google shows you the cheapest destinations from your city across different price ranges. This works well if you're willing to go anywhere—you see immediate savings options.
7. Check incognito mode to avoid price inflation. Once you've narrowed your choice, open a new incognito/private browser tab and search the same flight again. Google Flights doesn't inflate prices based on searches, but airlines sometimes do. Comparing in incognito ensures you're seeing the true lowest price available.
8. Book on the airline site or Google directly. Once you've found your price, you can book directly through Google Flights or click through to the airline's website. Booking through Google is fine, but check the airline site directly if you need special seats, luggage allowances, or have frequent flyer miles. Some airlines don't show full options through Google.

Why is the same flight cheaper on different days?

Airlines use dynamic pricing based on demand. Flights on Tuesday, Wednesday, and Saturday mornings are typically cheaper because fewer people want them. Peak travel days (Friday evening, Sunday afternoon) cost more. School holidays and summer also spike prices. Google Flights shows this pattern instantly.

Is it always cheaper to book in advance?

Usually, but not always. For most routes, 2-4 months ahead is optimal. But if prices are already high, waiting sometimes works—fares drop as departure gets closer on routes with weak demand. The price graph tells you the trend. If you see prices rising, book now. If falling, wait a week and check again.

Should I book a connecting flight to save money?

Often yes, if you have time. A 1-stop flight saves $100-300+ on many routes. The tradeoff: 2-6 extra hours, risk of missing a connection (unlikely, but possible), and less comfortable. If you're saving more than $150 and have 4+ hours between flights, it's usually worth it. For overnight flights, a connection might give you a free night in a hub city.

Can Google Flights prices be trusted, or do airlines show different prices on their own sites?

Google Flights prices are real and current. However, check the airline's site directly if you're booking a basic economy fare—some airlines don't display their absolute lowest fares on third-party sites, or they upsell seat selection and luggage on Google. The price should be identical, but availability of extras might differ.

What's the best way to use price tracking?

Set up tracking 2-4 months before you want to travel. Check your tracking emails weekly. When you see a drop of 10% or more, book within 24 hours—prices can jump back up. Don't wait for the absolute lowest price; that's rare. Lock in a good price when you see it, especially if it's lower than your research average.

Do incognito searches actually prevent price increases?

Google Flights itself doesn't adjust prices based on your search history. Airlines sometimes do track this, though it's rare. Using incognito is a safe habit and costs nothing, so it's worth doing—especially for final booking confirmation. It ensures you're seeing the true market price.

What if I find a cheaper price after I've booked?

Google Flights doesn't refund the difference, but most airlines let you cancel or modify your booking. Check your airline's policy: if you booked a refundable or flexible ticket, you can cancel for free and rebook the cheaper flight. If you booked a non-refundable fare, most airlines now let you apply the credit to a future flight, though they won't pay you cash back.