The Dufresnes

Summer is the season Europe was made for — long golden evenings on the Amalfi Coast, alpine passes with the windows down, sleeper trains gliding past sunflower fields, ferries hopping between Greek islands. Whether you're renting a car or buying a rail pass, a European summer is about movement, and the best trips string together multiple countries.

We've traveled full-time for over 4 years across 12 countries, and one lesson applies everywhere: the difference between a smooth multi-country trip and a stressful one usually comes down to staying connected the whole way. Here's our guide to the best European summer road trips and rail journeys — plus exactly how we'd keep our phones online across every border.

The connectivity shortcut: A Holafly Europe eSIM covers 30+ destinations on one plan with unlimited data, so you stay connected crossing every border — no SIM swapping, no roaming bills. Our THEDUFRESNES code saves 5–32%. 👉 https://holafly.sjv.io/6yWy0q

Why Summer Europe Travel Demands Reliable Data

European summer travel is gloriously spontaneous — but spontaneity runs on data. Across a single multi-country trip you'll constantly need:

• Navigation that actually works — European cities aren't grid systems, and rural roads love to surprise you
• Train and ferry booking apps — seats sell out, summer strikes reroute everything, schedules shift
• Toll, vignette and parking apps — many countries now handle road charges digitally
• Timed-entry tickets — the Louvre, Sagrada Família, the Colosseum all require booking ahead in peak season
• Translation — menus, signs, and ticket machines across a dozen languages
• Real-time everything — weather, closures, that pop-up beach club someone mentioned

A capped SIM that dies mid-trip is the last thing you want when you're navigating a Naples roundabout or sprinting for a connection in Zürich. Unlimited data removes the rationing entirely.

The Best European Summer Road Trips

1. The Amalfi Coast & Southern Italy

Hairpin turns, cliffside villages, and lemon groves. Drive from Naples through Sorrento, Positano, and Ravello. Connectivity matters most here for navigating impossibly narrow roads, finding scarce parking, and booking restaurants that fill up by noon in July.

2. The Swiss & Austrian Alps

Interlaken to Zermatt to Innsbruck — mountain passes, glacial lakes, and storybook villages. Heads up: Switzerland isn't in the EU, so it's excluded from most roaming and many "Europe" plans. Holafly's Europe eSIM includes Switzerland, which makes the alpine leg seamless.

3. Portugal's Atlantic Coast

Porto down to Lisbon to the Algarve — surf towns, custard tarts, and dramatic sea cliffs. A relaxed drive where you'll lean on data to find the best miradouros (viewpoints) and seafood spots off the tourist track.

4. The Scottish Highlands

Lochs, castles, and the North Coast 500. Remote, breathtaking, and a real test of coverage — exactly where a reliable connection earns its keep for navigation and emergency reach.

5. The Balkans

Croatia's coast through Montenegro to Slovenia — turquoise water, walled old towns, and prices that won't wreck your budget. Multiple borders make a single regional eSIM especially handy here.

Road trip app checklist: Google Maps or Waze, your rental company's app, a parking app (EasyPark works across much of Europe), toll/vignette apps for the countries you cross, and a translation app. All of them, all day — which is why unlimited data wins on a road trip.

The Best European Summer Rail Journeys

Europe's trains are a destination in themselves. With a Eurail (non-EU residents) or Interrail (EU residents) pass, you can roam freely — but modern rail travel is app-driven.

1. The Glacier Express (Switzerland)

Zermatt to St. Moritz across 291 bridges and through 91 tunnels — one of the world's great scenic rides.

2. The Bernina Express (Switzerland–Italy)

Alpine glaciers to Italian palm trees in a single day. Postcard-perfect.

3. Paris → Venice via the Alps

High-speed comfort threading through mountain scenery, linking two of Europe's most romantic cities.

4. The Flåm Railway (Norway)

One of the steepest standard-gauge railways on earth, plunging through fjord country.

5. Lisbon → Porto (Portugal)

A quick, beautiful coastal hop that pairs perfectly with a Portuguese road-trip leg.

Why data matters on the rails: Seat reservations (mandatory on many high-speed and scenic routes) are booked through apps. Summer strikes — especially in France and Italy — mean real-time schedule changes you need to catch instantly. Station boards, platform changes, and connection times all live on your phone. And those long scenic stretches are made for uploading photos and video-calling home.

How We'd Stay Connected All Summer

Multi-country travel is where a regional eSIM beats everything else. Here's the setup we'd use:

One Holafly Europe eSIM, 30+ destinations. Install it once before you fly. Cross from France to Switzerland to Italy and it just keeps working — no stopping at a border to swap SIMs, no hunting for a shop, no roaming shock on your bill back home.

Unlimited data. Navigate all day, book trains on the fly, upload every sunset. No caps, no throttling, no rationing on a 3-week trip.

Switzerland included. Worth repeating, because most plans leave it out and Swiss roaming is brutal.

Always On backup. Even after your plan ends, Holafly gives you 1GB of free data every month in 70+ destinations. Land for a quick return visit and you're connected for maps and a taxi before you buy anything.

Keep your home number active. Holafly is data-only and runs alongside your regular SIM, so you keep receiving calls and security codes on your usual number.

Holafly Europe Pricing with THEDUFRESNES

Our code applies to every Holafly purchase:

• 5% off the Europe regional eSIM (and all destination eSIMs)
• 10% off monthly Holafly Plans
• 32% off annual Holafly Plans (the biggest discount Holafly offers)

For a summer trip, the Europe regional eSIM is usually the sweet spot — pick the duration that matches your travels (5, 7, 15, 30 days and up), all unlimited. If you travel year-round or beyond Europe too, Holafly Plans covers 160+ destinations on one subscription.

👉 Get Holafly with THEDUFRESNES: https://holafly.sjv.io/6yWy0q (Affiliate link — we only recommend what we actually use.)

Quick Tips for a Connected European Summer

• Install your eSIM before you leave home — set it up on WiFi, activate when you land.
• Download offline maps as backup for remote stretches (Highlands, fjords, alpine passes).
• Screenshot your train tickets and reservations in case a station's WiFi is useless.
• Book timed-entry attractions in advance — July and August queues are brutal without a reservation.
• Add a buffer day or two to your eSIM in case plans stretch (they always do).

Make This Summer the One Where Everything Just Worked

Europe in summer is road trips and rail passes, border crossings and ferry rides, spontaneous detours and long golden evenings. Don't let dead data or roaming bills break the spell. One Holafly Europe eSIM keeps you connected across 30+ destinations all season — and THEDUFRESNES makes it the best value going.

Navigate every pass. Catch every train. Cross every border online. Share every sunset.

👉 https://holafly.sjv.io/6yWy0q — Code: THEDUFRESNES (5–32% off)

Buen viaje, bon voyage, buon viaggio — see you out there. 🚗🚆🌍

The Dufresnes are full-time travelers and Official Holafly Ambassadors since May 2022, testing Holafly across 12 destinations over 4+ years. Verified June 2026.