Quick Verdict
Discover Cars and Rentalcars.com are the only major platforms that show reasonably all-in pricing. Skyscanner, Kayak and Expedia show base rates only. Use Discover Cars for transparent booking and Skyscanner only as a market research starting point.
Quick Answers
- Only 2 major platforms show all-in prices: Discover Cars and Rentalcars.com
- Skyscanner, Kayak, Expedia show base rates only — price increases 40-60% at checkout
- Use Skyscanner for market research; use Discover Cars for the actual booking
- Always compare final checkout prices — never initial search prices
- Discover Cars had the lowest final all-in price in 9 of 12 test bookings
In This Article
Affiliate disclosure: ReviewPooch earns commission on purchases made through links in this article, at no cost to you.
The Dirty Secret of Car Rental Comparison
Almost every car rental comparison site has a financial incentive to show you the lowest possible number in search results. Showing base rates before insurance, fees and taxes maximises click-through. Understanding which platforms show what will save you significantly more money than any promo code.
Two Types of Platform
Metasearch engines (Skyscanner, Kayak, Google, Expedia) aggregate prices and earn referral fees on clicks. Booking platforms (Discover Cars, Rentalcars.com, rental company direct sites) own the booking transaction. Metasearch engines optimise for the appearance of low prices. Booking platforms have more accountability for accuracy since they are responsible for the booking.
Platform-by-Platform Results
Discover Cars: all-in prices from the first result — under 5% deviation between search price and final checkout. Rentalcars.com: partially inclusive prices — 10-20% average checkout uplift. Skyscanner: base rental rates only — 45% average checkout uplift. Kayak and Expedia: similar to Skyscanner — 35-55% average checkout uplift from search price to final payment.
When to Use Each Platform
Use Skyscanner or Kayak for market research — understanding the general price range without commitment. Then use Discover Cars for the actual booking where transparent all-in pricing means no surprises. Using both takes under 5 minutes and typically saves $50-150 on a week-long rental.
Frequently Asked Questions
Should I book directly with the rental company?
Usually no. Booking direct with Hertz, Avis or Enterprise bypasses comparison platforms but rarely results in lower prices. The exception: loyalty programme members who earn points on direct bookings may find direct booking worthwhile.
What is the cheapest car rental site?
This varies by destination and dates. In our testing, Discover Cars had the lowest final all-in price most often. The key is comparing final checkout prices — not initial search prices — for your specific search.
Are car rental hidden fees legal?
Technically yes — base rates that increase with taxes, airport surcharges and insurance at checkout are legal, and the final price is shown before payment is confirmed. Regulatory pressure to require all-in pricing in travel is increasing.
Compare Real All-In Prices on Discover CarsPros & Cons
Pros
- Honest comparison of platform pricing transparency
- Discover Cars wins clearly on transparent all-in pricing
- Saves time by identifying which platforms to trust for booking
- Based on real booking test data across 5 destinations
Cons
- Best platform still varies by specific destination and dates
- No single platform is perfect for every use case
Comparison Table
| Name | Price Shown | Checkout Uplift | Owns Booking | Score |
|---|---|---|---|---|
| Discover Cars | All-in | <5% | Yes | 8.7 |
| Rentalcars.com | Partial | 10-20% | Yes | 7.5 |
| Skyscanner | Base only | 40-60% | No | 6.5 |
| Kayak | Base only | 35-55% | No | 6.3 |
Bottom Line
Discover Cars and Rentalcars.com are the only major platforms that show reasonably all-in pricing. Skyscanner, Kayak and Expedia show base rates only. Use Discover Cars for transparent booking and Skyscanner only as a market research starting point.