Cheap Flight Tools That Actually Work (8 Tested for Americans)

I’ve booked 30+ international flights since 2022 using every major flight deal tool. Three are genuinely useful. Five are mostly marketing. Here’s the honest breakdown.

The TL;DR

For most travelers: Google Flights (free) + Going (paid, formerly Scott’s Cheap Flights). Google Flights for searching, Going for alerts. That’s the entire stack.

For business class deals: The Flight Deal (free) plus point.me for award searches. Skip everything else marketed at “premium” deal seekers.

For ultra-flexible travelers: Skiplagged for hidden-city ticketing and Kiwi for unusual routing.

The 8 tools tested

1. Google Flights — The foundation

Cost: Free
What it does: Search + price tracking + flexible date matrix + “Explore” map view
Best feature: Date grid showing prices across a whole month

Google Flights is the strongest free flight search tool, period. Most “premium” deal services pull from the same OTA data sources. The price prediction (Google tells you if a fare is high, typical, or low for the route) is accurate based on historical data.

The “Explore” feature is underused: enter your home airport, set a date range, click “Explore” — Google shows you destinations on a world map sorted by price. I found my $340 round-trip Boston-to-Reykjavik fare this way.

Pro tip: Set up alerts on Google Flights for specific routes. They email when fares drop. Better than most “deal site” alerts because they alert on YOUR specific route, not generic deals.

2. Going (formerly Scott’s Cheap Flights) — The best alert service

Cost: Free tier (limited), Premium $49/year, Elite $199/year (includes business class)
What it does: Curated email alerts for fare drops and mistake fares from your home airports

This is the only paid flight service I currently use. Their alerts are real fare drops (not “limited time sale” garbage). Examples from my inbox in 2024:

• NYC to Paris: $279 round-trip (typical: $700)
• LAX to Tokyo: $458 round-trip (typical: $1,200)
• Chicago to Cape Town: $720 round-trip (typical: $1,800)

The premium tier ($49/year) covers economy. Elite ($199/year) adds business class deals (which are 60-70% off retail when they hit). I’ve never bought Elite because I rarely need business class at retail; I use points instead.

Catch: You don’t get to pick destinations. You take what they send. If you’re flexible on where you fly, this is gold. If you need to be in Tokyo on a specific weekend, this won’t help.

3. Hopper — Best price prediction app

Cost: Free (with paid features)
What it does: Predicts when fares will drop and tells you to “wait” or “buy now”

Hopper’s price prediction is genuinely useful. They claim 95% accuracy within ±$10. In my testing, they were right 7 out of 10 times.

Catch: The booking experience has hidden fees. Hopper adds 5-15% markup on most bookings via “service fees” and “Hopper Cash” mechanics. Use Hopper for prediction, then book directly with the airline.

4. Kiwi.com — Best for unusual routing

Cost: Free
What it does: Combines flights from carriers that don’t normally interline (e.g., Ryanair + Emirates)

Kiwi specializes in “virtual interlining” — booking separate flights as a single itinerary. You can find absurd routings: Boston-London via Reykjavik-Stockholm on three different airlines for 30-40% less than direct.

Catch: The connections aren’t protected by the airlines. If your first flight is delayed and you miss the second, you’re on your own (unless you buy Kiwi’s optional protection at booking, which costs $20-30 per ticket).

Best for: Flexible solo travelers willing to navigate connections themselves.

5. Skiplagged — Hidden city ticketing

Cost: Free
What it does: Finds flights where flying to a “hidden” further destination is cheaper than flying to a closer destination if you just get off at the connection

Classic example: I needed to fly NYC to Charlotte. The direct fare was $380. A flight from NYC to Atlanta with a Charlotte connection was $145. Skiplagged found this. I got off at Charlotte and skipped the second leg.

Catches:

• Only works one-way (you can’t book a return because you’d be a no-show on the first leg)
• Don’t check bags (they’ll go to the final destination)
• Airlines technically prohibit this; doing it often can get you frequent flyer status revoked or banned from the airline
• Doesn’t work for international (immigration sees your ticket destination)

6. Momondo — Aggregator (skip)

Cost: Free
What it does: Searches the same OTAs as Google Flights but with a different UI

I used to recommend Momondo. Google Flights now does everything Momondo does, faster, with cleaner data. Skip Momondo unless you specifically prefer their UI.

7. Kayak — Aggregator (skip)

Cost: Free
What it does: Same as Momondo

Owned by Booking Holdings (same parent as Booking.com, Priceline). Their results are slower and less complete than Google Flights. Their “deals” section is mostly OTA upsells.

8. Expedia / Booking.com Flights — Avoid for booking

Cost: Free
What it does: Sells flights with markup

OTAs add hidden fees and make customer service harder. If anything goes wrong (delay, cancellation), the airline will tell you “go to Expedia” and Expedia will tell you “go to the airline.” Always book directly with the airline.

Use these only for search, not booking. Then go directly to the airline’s website to book.

The actual workflow for finding cheap flights

Step 1: Subscribe to Going ($49/year)

Set your home airports (you can pick 3-5). Wait. When a deal alert lands, evaluate quickly — these fares disappear in 2-12 hours.

Step 2: Build your own searches on Google Flights

For specific date trips, use Google Flights’ date grid + flexible date toggle. Set up alerts for routes you’re considering.

Step 3: Check Skiplagged for one-ways

Especially for domestic one-ways or US-to-US legs. Can save 50%+.

Step 4: Use Hopper to validate timing

Once you find a fare on Google Flights, check Hopper to see if they predict the fare will drop. If they say “wait”, wait. If they say “buy now”, book.

Step 5: Always book directly with the airline

Never through Expedia, Kayak, or other OTAs. The airline’s own website is the same price 99% of the time and customer service is infinitely better.

Other tactics that actually work

The “Tuesday at 3pm” myth

The legend that fares drop on Tuesday afternoons is mostly false now. Flight pricing is algorithmic in real time. There are no consistent “best days” to book.

What IS true: booking 6-8 weeks before domestic flights, 10-16 weeks before international, tends to find the lowest fares. Booking within 2 weeks of departure usually means paying 30-50% more.

Award flights (using points)

This is the entire game for premium cabin deals. A 70,000-point ANA award can book a $9,000 business class flight from NYC to Tokyo. Transfer Chase or Amex points to airline partners.

Tool: point.me (formerly AwardWallet’s search tool) or seats.aero (free, finds award availability across airlines).

Mistake fares and error fares

Real deals where airlines accidentally publish low prices. Examples: $300 to fly Madrid to Buenos Aires in business class. These get caught and cancelled fast — book first, ask questions later. Going Premium and The Flight Deal both alert on these.

Open-jaw and stopover tricks

An “open jaw” is flying into one city and out of another. Often costs the same as round-trip but lets you cover more ground. A “stopover” lets you spend days in the layover city for free (Icelandair, Turkish Airlines, Singapore Airlines all allow this).

Positioning flights

Sometimes the cheapest way to fly from a smaller city is to fly to a hub first separately. NYC residents: it’s often $200 cheaper to fly to LAX, then LAX to Asia, than NYC to Asia direct. The “extra” flight costs less than the savings.

What to never do

• Never call the airline for the lowest fare. Phone bookings have a $25-50 surcharge. Always book online.
• Never use incognito mode to “trick” airline pricing. Modern airlines don’t track your cookies for pricing. The “incognito for cheaper flights” thing is a myth.
• Never book OTAs (Expedia, etc.). Hidden fees, terrible customer service. Always book direct with the airline.
• Never trust “limited time” emails from airlines. They send 4-5 of these per week. None are real deals.
• Never overpay for “premium economy” without research. Often a 50% markup for 2 extra inches of legroom. Compare with bulkhead and emergency exit seats in regular economy.

FAQs

What’s the best app for finding cheap flights?

Google Flights (free) is the strongest search tool. Going (formerly Scott’s Cheap Flights, $49/year) is the best deal alert service. Together these cover 90% of the market.

How far in advance should I book flights?

Domestic US: 6-8 weeks before departure. International: 10-16 weeks. Booking within 2 weeks of departure typically means paying 30-50% more.

Is Going (Scott’s Cheap Flights) worth it?

Yes if you’re flexible on destinations. The $49/year Premium tier has paid for itself many times over for me — single deals often save $400-800 on a single flight. If you need to fly specific dates to specific places, the alerts may not help you as often.

What about hidden city ticketing on Skiplagged?

It works for one-way domestic flights and saves real money (often 50%+). Don’t check bags, don’t book round-trip, and don’t do it often on the same airline — they can ban you. Avoid for international flights (immigration sees the ticket destination).

Should I book directly with the airline or use an OTA?

Always book directly with the airline. OTAs (Expedia, Kayak, Booking.com flights) add hidden fees and make customer service nearly impossible when things go wrong. Use OTAs only for searching, never for booking.