Quick answer: For most travelers, OVOSIM's Serbia eSIM (from €3.50, A1 network, 5G/4G LTE) beats Airalo on price at every data tier and beats Holafly for anyone who doesn't need true unlimited data. Airalo runs on Yettel rather than A1 — check which network matters more for your route. Holafly wins only if you want unlimited data and are staying under 10 days, since its per-day cost keeps dropping the longer you stay.
Why compare eSIMs for Serbia at all
Serbia isn't in the EU, so standard "Europe" eSIM plans don't cover it — you need a Serbia-specific or Balkans regional plan either way. Once you're choosing a dedicated Serbia plan, network and price differences between providers become the whole decision.
OVOSIM vs Airalo vs Holafly — Serbia
| OVOSIM | Airalo | Holafly | |
|---|---|---|---|
| Network | A1 (5G/4G LTE) | Yettel (4G) | A1 / Yettel / Telekom Srbija (multi-network) |
| Entry price | €3.50 (1GB, 7 days) | ~$4.50 (1GB, 7 days) | ~$7.90/day, dropping to ~$3.99/day at 10 days |
| 5GB plan | €14.99 (30-day option from €9.99 promo) | ~$11 (30 days) | Unlimited only — no fixed-GB tier |
| Data model | Fixed data tiers | Fixed data tiers | Unlimited (FUP may apply after a threshold) |
| KYC | Not required | Not required | Not required |
| Hotspot | Yes | Check before buying | Yes |
Prices above are the entry tiers we could verify at the time of writing; check each provider's site for current pricing before you buy, since eSIM pricing changes often.
Where each provider actually wins
OVOSIM is the better fit if you want a fixed amount of data at the lowest per-GB cost, and you want a single network (A1) with reliable 5G in Belgrade and Novi Sad. It's also the natural choice if your trip continues into Kosovo, Montenegro, Albania, or elsewhere in the Western Balkans — the Balkans regional plan covers the whole region on one eSIM instead of switching providers at each border. For the full regional breakdown, see our best eSIM for the Balkans guide.
Airalo is a reasonable alternative if you specifically want the Yettel network, or you're already using Airalo elsewhere on your trip and prefer to stick with one app. It doesn't currently list a Balkans regional plan the way OVOSIM does, so a multi-country Balkans trip means buying separate country eSIMs.
Holafly makes sense if you genuinely need unlimited data — heavy streaming, hotspotting a laptop all day, video calls — and you're staying long enough (roughly 10+ days) for the per-day cost to come down. For a short trip or for anyone who just needs maps, messaging, and normal browsing, fixed-data plans from OVOSIM or Airalo cost meaningfully less.
Honest trade-off
If you're spending your whole trip in Serbia for several weeks and have a way to register a local SIM, a physical SIM from A1, Yettel, or mts can beat any eSIM on pure price per GB. Where eSIMs win is landing connected immediately, keeping your home number active, and — for OVOSIM specifically — carrying that same connection across Balkans borders without buying a new SIM in each country.
FAQ
What network does OVOSIM use in Serbia? A1, with 5G/4G LTE coverage across Belgrade, Novi Sad, Niš, and the main towns.
Is Airalo or OVOSIM cheaper for Serbia? OVOSIM is cheaper at every data tier we compared, starting from €3.50 versus Airalo's roughly $4.50 for the same 1GB/7-day entry plan.
Does Holafly work in Serbia? Yes, through a regional Balkans plan (not Holafly's Europe plan, which excludes Serbia) using a mix of A1, Yettel, and Telekom Srbija.
Which is best for a Balkans multi-country trip? OVOSIM, since its Balkans regional plan explicitly covers Serbia alongside Albania, Kosovo, Montenegro, North Macedonia, Bosnia, Croatia, Bulgaria, and Greece on one eSIM.
Continuing across the region? See our guides for Albania, Kosovo, Montenegro, and the full Balkans plan.