LetsFG — Flights & Hotels vs ViaFrei
A side-by-side look at the LetsFG — Flights & Hotels and ViaFrei MCP servers: transport, auth, tools, quality signals, and the config to install either one in Claude, Cursor, Windsurf or VS Code.
Verdict: choose LetsFG — Flights & Hotels for travel & transportation work as a local process; choose ViaFrei for travel & transportation as a local process. You can also run both side by side in one mcpServers block.
Which MCP server should you choose?
Choose LetsFG — Flights & Hotels when
- You need dedicated capabilities in the Travel & Transportation domain.
- You prefer a local stdio subprocess transport.
- You want tools like
search_flights, resolve_location, book_flight.
Choose ViaFrei when
- You need dedicated capabilities in the Travel & Transportation domain.
- You prefer a local stdio subprocess transport.
- Its auth model fits you: No auth required.
- You want tools like
check_autobahn_traffic, find_cheapest_fuel, find_fuel_station.
Feature & specification comparison
Rows where the two servers differ are marked.
| Spec | ||
|---|---|---|
| Category | Travel & Transportation | Travel & Transportation |
| Quality signal | 69/100 · Great | 64/100 · Good |
| Install command | Confirmed | Confirmed |
| Transport | Local subprocess (stdio) | Local subprocess (stdio) |
| Auth | Not declared | No auth required |
| Pricing | Not declared | Free |
| Required env vars | None listed | None listed |
| Verified owner | Community listing | Community listing |
| GitHub stars | 2,175 | 0 |
| Directory activity | 2 views 1 installs 0 upvotes | 1 views 0 installs 0 upvotes |
| Tools | 14 | 22 |
| Full listing | View LetsFG — Flights & Hotels | View ViaFrei |
Tools & capabilities
LetsFG — Flights & Hotels tools 14
search_flightsSearch hundreds of airlines for live flight prices — completely FREE, unlimited, read-only. Returns structured offers with prices, airlines, times, durations, and stopovers. Some offers carry `starlink` for in-flight Starlink Wi-Fi: "confirmed_all" / "confirmed_some" mean the carrier has FULLY fitted that aircraft type, "likely_all" / "likely_some" mean the rollout on that type is underway but incomplete. State only "confirmed_*" as fact; describe "likely_*" as "the airline is fitting this aircraft type, not guaranteed on your flight". Anything ending in "_some" has at least one leg WITHOUT it. An absent field means no information, NOT an absence of Wi-Fi. Covers airlines across all continents including low-cost carriers. Search is async: this tool polls for you, including waiting out the late split-ticket merge. Some offers are SPLIT TICKETS: two separately-issued tickets through a hub, each leg booked from whatever is cheapest for it (usually two different airlines), because no one seller offers the combination as a single ticket. They carry `split_ticket: "true"`, `combo_type: "virtual_interlining"` and `self_transfer: "unprotected"`. ALWAYS tell the user when an offer is a split ticket and what unprotected means: the tickets are not linked, so if the first flight is late and the connection is missed, the second airline owes nothing — no rebooking, no refund. Never present a split ticket as though it were one through-fare. Requires LETSFG_BEARER_TOKEN or LETSFG_API_KEY. See letsfg://guide resource for the full authenticate->search->book workflow.resolve_locationConvert a city/airport name to IATA codes. Always call before search_flights if you only have a city name. Read-only, safe to call multiple times.book_flightBook a flight from a search result. FLOW: authenticate (once) -> search_flights -> book_flight CHARGES: nothing from LetsFG. A completed booking pays the airline prices from airlines and the major booking sites. RESULT: either {"booked": true, "order_id": "..."} or {"booked": false, "booking_url": "..."} — the second means the booking genuinely did not complete and nothing was charged. That is a normal outcome, NOT a transient error: do not retry, give the user the booking_url. SAFETY: use REAL passenger details — names must match passport, email receives the e-ticket.get_flight_bookingPoll a flight booking started by book_flight. REQUIRED to learn the outcome: on a PFS Bearer token book_flight returns a booking_ref and state "booking_in_progress", not a PNR - the booking itself takes 4-11 minutes. Call it every 20-30 s with that booking_ref until state is terminal: completed -> PNR issued, card charged failed -> the hold was released, nothing was charged needs_attention -> a human is looking at it; do NOT rebook Do not rebook while the state is still moving, and do not treat a slow poll as a failure - the money is HELD, not taken, until the airline confirms. Refs last one hour past the booking start.answer_booking_questionAnswer the question a paused booking is waiting on. get_flight_booking returns `awaiting_choice` when the booking agent has stopped mid-checkout holding a cart: at the airline's own seat map, at a paid extra it has just priced, or at a fare that moved. NOTHING PROGRESSES UNTIL YOU ANSWER, and the cart expires. Put the question to the traveller with the options and the time left, then send their answer here. kind "seat" -> seats: [{ d: "12A" }, ...] from the map you were shown, or skip: true kind "extra" -> confirm: true to take it (a bag, or a moved fare), or confirm: false / skip: true to decline Always pass the `round` from `awaiting_choice` - it says WHICH question you are answering. A return trip pauses twice, and an answer without it could seat the wrong leg.resolve_hotel_cityConvert a place name to the supplier city id that search_hotels needs. Always call this first if you only have a city name. Read-only and safe to repeat. Use `Id` from the first result as city_id and `Name` as city_name.search_hotelsSearch real, bookable hotel inventory. Requires a connected payment method — the SAME one that authorises flight booking. That applies to search too, not just booking, because a search opens a real session at the supplier. Every rate type is returned, refundable and non-refundable; each offer's `refundable` and `free_cancellation_until` say which. `price` is what the guest pays, in `currency` (USD unless you pass currency): the supplier's cost plus `markup_rate` (6.4% for Revolut Pay or an EEA card, 8.3% for a card issued outside the EEA). Nothing is added at booking. Keep the chosen offer whole — book_hotel needs its `session_id`, `combination_id_v2`, `price`, `expected_cost`, `currency` and `fx_rate`. Takes up to a few minutes.book_hotelBook one hotel rate. The offer's full price is HELD on the connected Revolut payment method (authorised, not taken); LetsFG books and pays the supplier; the hold is captured only once the supplier has confirmed. If the booking fails for any reason the hold is released and nothing is charged. There is no reservation fee, no deposit and no pay link. Returns a booking_job_id, NOT the booking — a booking takes minutes. Poll get_hotel_booking every ~20s until status is succeeded, failed or attention; all three are final. Copy expected_price (the offer's price), expected_cost, currency and fx_rate from the chosen offer exactly. A USD offer sent without its currency is refused (400 price_mismatch). Guest names, phone and e-mail are checked before anything is held (400 invalid_details). guests needs ONE name per guest in the room, children included — adults first, then children in child_ages order. Do NOT call book_hotel again for a booking whose job is running — poll it; a retry returns the same job (duplicate: true).get_hotel_bookingCollect the result of a booking started with book_hotel. Poll every ~20s. status is in_progress, succeeded, failed or attention; the last three are final — stop polling. - succeeded: confirmation, hotel, room, total_price + currency (what the guest is charged), supplier_paid + supplier_currency, payment_status, refundable, free_cancellation_until, cancellation_ladder and terms. - failed: error, written for the guest. The hold was released; nothing was charged. - attention: error (+ confirmation if known). The outcome could not be settled automatically; the hold is kept (nothing charged) while a person checks with the supplier. Do NOT book again. The guest is e-mailed in every case. Read-only and safe to repeat.cancel_hotel_bookingCancel a hotel booking made by this account and refund the guest. A zero-charge cancellation (a refundable rate before free_cancellation_until) refunds the charge in full; a cancellation that would cost money is refused (409) — the hotel's own ladder is in the booking terms. Takes over a minute; if it times out do NOT assume it failed — re-check before retrying.authenticateExplain how to connect a card so this server can search and book. Nothing is charged to connect — a 0.00 Revolut setup that saves the card so a booking can be charged later. Call with no arguments. It returns the current instructions and add_card_url (https://letsfg.co/connect). A PERSON must approve once in a browser — there is no endpoint that mints a token from card details, so do not ask the user for card numbers and do not try to automate this step. Two ways in: (a) add LetsFG as a connector in an assistant that supports remote MCP servers and approve it, or (b) any OAuth-capable client can register itself — see https://letsfg.co/for-agents, section "Option B". Both land on the same card screen. RETIRED 2026-09-02: the Stripe lanes (setup_url, setup_session_id, payment_method_id, card_token) and every token they issued. Passing them now fails. This does NOT create a Developer API billing account. Do not use connect_payment for this.connect_payment[Developer API only — you almost certainly want `authenticate` instead] Mints a one-time link for connecting a payment method to a PAID prepaid Developer API account. Nothing is charged to connect and card details never touch LetsFG: a PERSON opens the returned connect_url in a browser and saves a card, Revolut Pay or Google Pay there. Do not ask a user for card numbers and do not try to automate that step. Refuses to run unless LETSFG_API_KEY is set, because agents kept calling this and creating billing accounts they did not need. Replaced setup_payment on 2026-09-08, when the Stripe lane was retired.- +2 more on the listing page
ViaFrei tools 22
check_autobahn_trafficJams, slow traffic, closures and roadworks in force this minute on up to 5 motorways, with delay/speed. Use when asked about a named motorway now: Stau, a delay, how it looks, or a LIST of closures now; name every motorway (Munich→Berlin: A9). Do NOT use for yes/no: is a road open/closed/passable — check_road_status, even now — nor a closure with no time word or a later one (tonight, weekend); Baustellen dated or geplant — find_roadworks_ahead; Stau in a town, no motorway — check_road_status; fuel (find_cheapest_fuel), trains (get_train_departures). ~5 min old. Show the attribution line.find_cheapest_fuelReturns the cheapest stations for one fuel grade near a place or coordinate: price per litre, brand, address, distance, open state. Use when the user asks where to fill up or what fuel costs. Do NOT use for charging an electric car (call find_charging_station), price history, or traffic (call check_autobahn_traffic). Radius ≤ 25 km, at most 10 stations. For a brand, a name, open now or at a named time, or nearest-first, call find_fuel_station. Each line names the age of its price and opening-hours claim. Prices are consumer information only; the attribution line and MTS-K note must be shown.find_fuel_stationFinds filling stations around a place or coordinate under any combination of filters — grade, brand, name, open now, open at a time you name, open 24 h — sorted by distance, price or name. Use when the question is WHICH station: the closest diesel to a stop, an ARAL open tonight, what one forecourt sells. Do NOT use for the plain "where is fuel cheapest" question (call find_cheapest_fuel) or for charging an electric car (call find_charging_station). Every result carries the attribution and the MTS-K note, and says how old each price and opening-hours claim is.find_parkingParking near a place, a coordinate or along one motorway: lorry parks, car parks, P+R and disabled-badge bays, with total spaces and, where published, free spaces now and the reading's age. Use when asked where to park or leave the car for the train ("Parkhaus in Köln", "Rastplatz A3", "P+R"). Do NOT use for fuel (find_cheapest_fuel) or EV charging (find_charging_station). Radius ≤ 25 km, ≤ 10 sites per list; ODbL and CC BY-SA sources are separate lists (up to three). No "free now" means no published count, not full. No prices: for "was kostet" say so, no call. Show each source's attribution.check_road_statusIf a motorway, B/Land road (NI, BW, MV, SN, TH; B also SH, BY, BE; pass Land/town as place) is open/closed/restricted now/next days; by place, jams, city/Land messages, Hamburg traffic cameras; lorry limits, Lang-Lkw (vehicle). Use when asked if a road is open/passable — "ist die A8 in diesem Moment gesperrt", at any clock, closures tonight/weekend — or city Stau: "Stau in Köln?". Do NOT use for jams/delays on a named motorway or multi-motorway route — check_autobahn_traffic; roadworks by date window — find_roadworks_ahead; city street: not held, say so. ≤ 14 days/11 entries. Show attribution.find_roadworks_aheadReturns roadworks PLANNED on one motorway, one Bundes-/Landesstraße in NI, BW, MV, SN or TH (BY: B only), or city streets by place, in a date window: section, restriction, dates. Use when a date or window is named, it says geplant, or how long a site lasts ("Baustellen auf der A7 in den Sommerferien?"). ONE road/place per call. Do NOT use when more than one motorway is named, for the situation this minute, or for Baustellen with neither date nor geplant — all three are check_autobahn_traffic; whether a road is open — check_road_status. ≤ 92 days, max 20 sites. Show attribution.find_charging_stationReturns EV charging sites near a place or coordinate with operator, connector types, maximum power, price per kWh where published, and how many points are free right now where the operator publishes live status. Use when an EV driver asks where to charge ("Wo kann ich laden?", "CCS 150 kW near Leipzig", "ist gerade eine Säule frei?"). Do NOT use for petrol or diesel — call find_cheapest_fuel; for E-Kennzeichen or Ladekarte rules — call get_driving_rules. Radius ≤ 25 km, ≤ 10 sites; availability is missing for most operators and is then unknown, never free. Show the attribution line.find_hydrogen_stationReturns hydrogen (H2) filling stations near a place or coordinate, nearest first, with operator, address, pumps (700 bar car, 350 bar truck/bus), opening hours where published and the age of the record. Use when someone asks where to refuel a fuel-cell car, lorry or bus ("Wasserstofftankstelle", "H2 tanken", "hydrogen station near me"). Do NOT use for petrol or diesel (call find_fuel_station) or EV charging (call find_charging_station); LPG/Autogas and CNG are not held — say so. Radius ≤ 150 km, ≤ 10 stations; no live availability or price is published. Shows the attribution line.find_placeLooks up a place name and returns every match, each with its kind, population, English name and coordinate; the official key (AGS/RS) only in the structured result. Use when the person asks where somewhere is, when you need a coordinate for another tool, and above all to RECOVER after a tool reported a name as ambiguous — this is where you find out which Neustadt is which. Pass `near` to rank and separate same-named places by distance. Do NOT use to find a company, shop or landmark: call find_poi. At most 10 results, radius <= 200 km. Every result carries an attribution line to show the user.find_poiFinds a business or landmark by name or kind — company, shop, clinic, hotel, hostel — with address, category and coordinate. Use when the person names a THING rather than a town: "the adesso office in Dortmund", "the nearest Aldi", "a hotel in Weimar". The coordinate passes to any other tool as lat/lon. Do NOT use for a town, district or station (every tool's `place` resolves those), nor for fuel, charging or parking (own tools). Give "in" (a town) when you can: far faster than nationwide. 25 per page, 50 via cursor; radius <= 50 km. OpenStreetMap under ODbL 1.0; show the attribution line.find_addressLooks up a street address: its coordinate, and the named OpenStreetMap objects at it (company, shop, office) or that none are. Use when the person gives a STREET AND NUMBER — "Bahnhofstraße 12, Fulda" — for the point or the business there, never who lives there. The coordinate passes to any other tool as lat/lon. Do NOT use for a town/district/station name alone (find_place) or a company/shop/landmark by name (find_poi). At most 5 points; a door mapped twice is folded, points far apart say how far; several towns are a question. OpenStreetMap ODbL 1.0; show the attribution line.describe_locationTurns a coordinate into words: the nearest address, settlement and motorway junction with their distances, and the Gemeinde, Kreis and Land the point lies in; also any low-emission zone. Use when you already HAVE a lat/lon and need to say where that is. Do NOT use to look up a place or address BY NAME — that is find_place, find_poi or find_address; this only goes coordinate to words. Those come from the municipality the point lies in (its key), not the nearest Kreis point; near the border the answer says so. OpenStreetMap ODbL 1.0 for the address; show the attribution line.- +10 more on the listing page
Ready-to-paste client configs
Paste either block (or both) into your client config, e.g. claude_desktop_config.json or ~/.cursor/mcp.json. We only show a config when the install command is confirmed.
LetsFG — Flights & Hotels
{
"mcpServers": {
"letsfg-flights-hotels": {
"command": "npx",
"args": [
"-y",
"letsfg-mcp"
]
}
}
}
ViaFrei
{
"mcpServers": {
"viafrei": {
"command": "npx",
"args": [
"-y",
"viafrei"
]
}
}
}
Frequently asked questions
LetsFG — Flights & Hotels is categorized under Travel & Transportation and uses a local stdio subprocess. ViaFrei belongs to Travel & Transportation and uses a local stdio subprocess. Pick LetsFG — Flights & Hotels for travel & transportation work and ViaFrei for travel & transportation.
Copy the mcpServers block from the config section on this page into your client's config (for example claude_desktop_config.json or ~/.cursor/mcp.json), then fully restart the client.
LetsFG — Flights & Hotels has no declared pricing — check the project's own site. ViaFrei is listed as free. Auth: no auth required. If a server needs environment variables such as API keys, define them under the env key in your client's MCP config.
Yes. MCP clients support multiple servers: add letsfg-flights-hotels and viafrei as separate keys in the same mcpServers object, and your assistant will call tools from either one.
On AllMCPs, LetsFG — Flights & Hotels has a quality signal of 69/100 (Great) with 2 views, 1 installs and 2,175 GitHub stars. ViaFrei has 64/100 (Good) with 1 views, 0 installs and 0 GitHub stars.