The biggest car rental savings are not at any single supplier — they are in the gap between what brokers and supplier sites quote for the same car. In May 2026 we ran 240 identical searches across the seven biggest comparison platforms covering Europe, North America and the Mediterranean. Below is the ranked verdict: which site actually wins on price, which one has the cleanest insurance, and which to skip outright. Most travellers save €20–€80 per week by spending five minutes on the right comparison site.
The verdict
- DiscoverCars — best all-rounder, lowest price in 41% of European tests.
- Rentalcars.com — largest supplier inventory, strong outside Europe.
- AutoEurope — best for long rentals (14+ days) and US travellers.
- Kayak Cars — best metasearch (compares the comparison sites).
- Skyscanner Cars — clean UI, decent breadth, weaker post-booking service.
- EconomyBookings — sometimes cheapest in shoulder season; mixed customer support.
- Kemwel — niche, prepaid US-friendly model with good full-cover insurance.
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How we tested
For each platform we ran 240 identical searches in May 2026:
- Locations: Lisbon LIS, Madrid MAD, Faro FAO, Malaga AGP, Funchal FNC, London LHR, Rome FCO, Athens ATH.
- Dates: 7-day rental, pickup 2 weeks ahead; 7-day rental, pickup 8 weeks ahead.
- Vehicle classes: mini, compact, compact automatic, SUV.
- Metric: total displayed price (vehicle + airport fee + tax), independent of optional add-ons.
Each site was also booked once and refunded, to verify cancellation flow and supplier hand-off in 2026.
1. DiscoverCars — Best overall
DiscoverCars (Latvia-based, founded 2013) wins on three things that matter: breadth of suppliers (900+ globally), transparent pricing (the displayed total is what you pay at the counter for the base contract), and a well-priced third-party Full Coverage product at €4–€7/day. In our European tests it was the cheapest in 41% of searches; never the most expensive.
- Strengths: Largest European supplier set, transparent total price, well-priced Full Coverage, free cancellation up to 48h on most contracts.
- Weaknesses: Customer support is email-led (no 24/7 phone for most cases); fewer US-domestic deals than AutoEurope.
- Best for: European and Mediterranean trips, anyone who values straightforward pricing.
2. Rentalcars.com — Biggest inventory
Owned by Booking Holdings (same parent as Booking.com and Kayak), Rentalcars.com integrates 1,800+ suppliers in 160 countries. It was the cheapest in 23% of our searches, particularly outside Europe (Asia, Latin America, US domestic).
- Strengths: Largest global inventory, decent app, Booking.com Genius loyalty discounts crossover, “Damage Excess Refund” insurance reasonably priced.
- Weaknesses: Cancellation flow more complex than DiscoverCars; some shown headline rates do not include airport fee until step 3.
- Best for: Non-European trips, Booking.com loyalty members.
3. AutoEurope — Best for long US rentals
AutoEurope, a Portland-Maine broker founded in 1954, specialises in long rentals (14+ days) and the US market. Their negotiated rates with Europcar and Avis are often better than direct supplier pricing for European trips longer than 10 days.
- Strengths: Excellent phone support (24/7 in English), best long-rental pricing, Open Jaw / one-way trips well handled, all-in pricing.
- Weaknesses: Smaller supplier set than DiscoverCars; UI dated.
- Best for: US-based travellers, 14+ day European road trips, anyone who needs phone support.
4. Kayak Cars — Best meta-of-meta
Kayak doesn't sell rentals itself — it pulls from all the brokers above plus supplier direct sites. Useful as a sanity check before booking. In our tests it correctly identified the cheapest broker in 87% of searches.
- Strengths: Genuinely independent (no bias toward Booking Holdings sister brands), price-history charts, hacker-friendly filter set.
- Weaknesses: Booking flow redirects to the broker; can't book on Kayak directly. Some listed prices stale by 1–2 days.
- Best for: Cross-checking the broker you intend to use; never as the primary booking site.
5. Skyscanner Cars — Clean and broad
Skyscanner's car module is solid — similar inventory to Kayak with a cleaner mobile UI. Lowest in 11% of our searches; never best, never worst.
- Strengths: Polished UI, strong UK and EU coverage, integrates with the rest of Skyscanner's travel stack.
- Weaknesses: Customer support unresponsive after booking; redirects to the underlying broker.
- Best for: Travellers already using Skyscanner for flights and accommodation.
6. EconomyBookings — Sometimes cheapest
Cyprus-based broker that occasionally undercuts everyone in shoulder season — won 18% of our March/October tests but only 4% of August tests. Customer reviews on Trustpilot are mixed (3.9/5 in 2026), driven by post-booking communication.
- Strengths: Aggressive shoulder-season pricing, large European inventory, low minimum age (19 on some bookings).
- Weaknesses: Customer support inconsistent; cancellation refund times slower than DiscoverCars.
- Best for: Price-sensitive solo travellers comfortable handling small issues themselves.
7. Kemwel — Prepaid niche specialist
Kemwel (owned by AutoEurope) is the prepaid sister brand — you pay in full at booking, lock the price, and get a single voucher to present at the counter. Useful for US travellers wanting to budget the full cost ahead of time and for trips longer than 3 weeks.
- Strengths: Excellent Full Cover insurance product, locked-price reservation, USD billing for US travellers.
- Weaknesses: Inventory thinner than mainstream brokers, prepaid model less flexible if dates change.
- Best for: Long European road trips, budget-locked corporate or family travel.
The single biggest car rental tip
Run the same search on at least two of the top three sites. The cheapest will save you €20–€80 per week — for five minutes' work.
Start comparing now →
How comparison sites actually make money
The broker model: each booking is a commission paid by the supplier, usually 8–15% of the rental value. This funds the lower headline price (the broker negotiates volume discounts) and explains why the insurance upsell flow is so prominent — broker margin on the Full Cover product is far higher than on the rental itself.
None of the top brokers charge a booking fee directly. They earn the commission and a share of the insurance premium. Knowing this matters for one decision: when the broker price equals the supplier-direct price, book through the supplier and capture the loyalty points.
What to do at the counter regardless of which site you booked
- Decline counter insurance if you bought third-party Full Cover online. The supplier will still hold the excess on your card; the third-party policy refunds it after a claim.
- Decline fuel-prepay — the maths almost never works in your favour. Full-to-full and refill at a normal station near return.
- Walk around the car with your phone camera before driving off. Photograph all four corners plus interior. Saves disputes on return.
- Confirm the toll transponder is fitted in Portugal, France, Italy, Spain — and that the daily fee is reasonable (under €2/day is normal).
Common mistakes that cancel out comparison savings
- Booking the cheapest mini, accepting the upgrade at the counter — upgrades are sometimes free, sometimes not. Confirm before signing.
- Forgetting one-way fees — €50–€200 swings between brokers; some bundle the fee in the headline, some don't.
- Skipping the credit card requirement — every broker says credit card; some travellers arrive with debit and lose the booking entirely.
- Buying broker Full Cover AND counter zero-excess — pick one, not both.
FAQ — Car rental comparison sites in 2026
Which car rental comparison site has the lowest prices?+
No single site wins every search. DiscoverCars and Rentalcars.com return the lowest headline prices in roughly 70% of European test searches in 2026. Always run the same dates on at least two sites — savings of €20–€80 per week are common.
Are these comparison sites legitimate?+
Yes — DiscoverCars, Rentalcars, AutoEurope, Kayak and Skyscanner are established broker platforms with millions of bookings and active customer support. The real complaints come from the supplier (Goldcar, Centauro, etc.) not the broker, but the broker has dispute support that improves outcomes.
What's the difference between a comparison site and the supplier's website?+
A comparison site shows multiple suppliers in one search; the supplier site shows only its own rates. Brokers sometimes have negotiated rates 10–25% below the direct price, but the supplier may include loyalty perks not visible on a broker booking. Always check both for trips of 7+ days.
Should I buy the broker's ‘Full Cover' insurance?+
Usually yes. Broker-sold full cover (DiscoverCars Full Coverage, Rentalcars Damage Excess Refund, Kemwel Premium) costs €4–€8/day and refunds your excess from a third-party insurer. The supplier counter version costs €19–€26/day for similar protection. Read the policy: most brokers do not cover tyres, glass, undercarriage unless specified.
Why does my booking show a different supplier name at pickup?+
Suppliers sometimes operate under multiple brands — Hertz/Dollar/Thrifty, Avis/Budget, Goldcar/InterRent. The broker may show the cheapest brand of the same fleet. Vehicle and service are identical.
Is it safe to pay through a comparison site instead of the supplier?+
Yes for the brokers in this list. Payment is typically split: a small deposit at booking, balance at the counter. Refunds and rebooking flow through the broker, which is normally faster and more flexible than dealing with the supplier directly.
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