To track flight prices and hotel rates for one trip, you repeat the same search daily on several sites and write down the full price. Price alerts cover parts of this. Sai checks your flights and hotel on a schedule and logs every price in a Google Sheet. It emails you with links when the trip total drops below your target. You book.
What it means to track flight and hotel prices for a trip
Tracking a trip's price means checking the same flights and room for fixed dates at regular intervals. Each check records the full price from each source, and you act when the combined total reaches a target. A useful log shows the price, the source, the link and the date of every check.
Most trackers watch one thing: a route, a city or a hotel. A trip is a combination. The flight can drop while the hotel rises, and the total is the number that matters.
Why it is hard to track flight prices and hotel rates together
- Each alert covers one piece. Google Flights emails you about a route or flight. Google added alerts for individual hotels in April 2026. No single alert adds the two together.
- Member rates sit behind a login. Booking.com Genius discounts and hotel loyalty rates show only to signed-in members. Marriott, for example, says its member rates are at least 2% lower on weekdays and up to 5% on weekends.
- The same flight costs different amounts on different sites. A search site and the airline's own site can show different fares for the same flights.
- Fees change the total. Since May 12, 2025, the FTC requires US hotels and short-term rentals to show the total price, including mandatory fees such as resort fees. Taxes can still be shown separately. The rule does not cover airfare.
What to check on every run
Use this list whether you track by hand or with Sai:
- Same search every time: airports, dates, number of travelers, cabin and bag rules.
- Same product: fare class (no basic economy if you need a seat choice), and the exact room type and refund policy.
- Full price before payment: taxes and mandatory fees included, per trip, not per night or per person.
- Source and link: where you saw the price, so you can book it before it changes.
- Member price: signed in where you have an account.
- Trip total: flights plus hotel, compared with yesterday and with your target.
Ways to track flight and hotel prices, compared
| Tool | Flights | Hotels | Member rates behind your login | Trip total |
|---|---|---|---|---|
| Checking by hand | Any site | Any site | Yes | Yes, if you keep a sheet |
| Google Flights and Google Hotels price tracking | Routes or flights, email alerts | Individual hotels, email alerts for signed-in users | No | No |
| Kayak Price Alerts | Exact or flexible dates, email or phone | A hotel or an area, checked daily | No | No |
| Hopper | Watches trips, predicts rises and drops, in its app | Hotel search and Price Freeze | No | No |
| Sai | Search sites and the airline's own site | Booking.com and the hotel's own site | Yes, after you approve the sign-in | Yes, logged daily in your sheet |
If you only need to know when one route gets cheaper, Google Flights or Kayak alerts are free and enough. Sai is for the trip as a whole: the specific hotel, the member rate and the combined total.
How to track flight prices and hotel rates with Sai
- Describe the trip. Airports, dates, travelers, flight rules, the hotel and room, and your target total. The full prompt is in the Start with a prompt tab above.
- Name the sites. For example Google Flights, Kayak, the airline, Booking.com and the hotel chain. Sai asks before signing in to any of them.
- Watch the first run. Sai searches each site on a real computer, the way you would, and you can follow every step.
- Check the log. Sai adds one row per run to your Google Sheet, with each price, its source and its link.
- Schedule it. Daily or weekly, with an end date. Sai emails you when the total meets your rule.
- Book it yourself. Open the link in the alert and book. Sai does not book, hold or pay.
Sai ranks #1 on OSWorld, the public benchmark for agents that complete tasks on a real computer. Once Sai completes the first run, its steps are kept as code that replays the same way, so daily checks are faster, cheaper and consistent.
When flight prices tend to move
Google published averages from five years of Google Flights data on US departures in October 2026. Use them to decide when to start tracking, not as a promise:
- Domestic flights: lowest prices came about 39 days before departure, in a low range of 22 to 57 days.
- International flights: lowest about 89 days out. The average drop across the 50 to 133 day range was insignificant, so Google suggests booking as soon as you can.
- Holidays: about 34 days out for Thanksgiving and 56 days out for Christmas.
- Day you book: Wednesday was cheapest, about 1.4% below Sunday, which Google calls negligible.
- Day you fly: leaving Monday and returning Tuesday or Wednesday saved about 14% over weekend flights. Nonstop tickets cost about 20% more on average than connecting ones.
Practical habits: start tracking before the low range begins and compare the same fare class every time. Prefer refundable hotel rates so you can rebook if the price falls.
Staying in control
- No booking, no payment. Sai alerts you and stops. It never enters card details.
- Sign-ins wait for you. Credentials are approved through a link, not typed into the chat.
- A light, personal pace. One trip, a few pages a day, as you. Read each site's terms, and don't use this to collect or resell prices.
Related use cases: compare prices across shopping sites and book a restaurant reservation.
Last reviewed October 13, 2026.