Spanish to English speech translation API
Stream Spanish (Español) speech and get English (English) back in real time. One WebSocket, ISO codes es to en, and ultra-low latency for voice agents and live apps.
Trusted by teams building global voice products
Production-ready Spanish to English translation API
Real Spanish speech includes accents, regional dialects, code switching, and domain-specific vocabulary. Soniox recognizes it in a single model and streams English while the speaker is still talking.
Spanish (Indo-European > Romance > Western Romance) and English (Indo-European > Germanic > West Germanic) come from different language families, so word order and morphology differ. Soniox reorders meaning in-stream instead of word by word.
Soniox preserves formatting in the translated transcript, including names, numbers, addresses, IDs, and domain-specific terms.
A breakthrough in real-time Spanish to English translation
Translate before the sentence ends
English meaning lands as Spanish is spoken, not after the caption catches up.
Directional es to en streaming
Set the source and target codes once. Both arrive in a single labeled token stream.
High quality English output
Same model across every language, including historically underserved ones.
Native-speaker Spanish STT accuracy
Accurate English translation starts with accurate Spanish recognition across accents and language switching.
Names, numbers, and domain terms
Preserved across the pair, including phone numbers, emails, and IDs.
{
"model": "stt-rt-v5",
"translation": {
"type": "one_way",
"source_language": "es",
"target_language": "en"
}
}Spanish and English through a single stream
Spanish to English translation is built on top of Soniox Speech-to-Text API. Every spoken word is transcribed, and English translation streams mid-sentence in the same labeled token stream.
Turn it on by adding a translation block with source_language: "es" and target_language: "en". It runs on the same WebSocket and the same model, with no extra round trip.
Live Spanish to English: written and spoken
Spanish to English speech-to-text
Translate live Spanish into written English with the Soniox STT API. Soniox streams the Spanish transcript and the English translation as speech happens.
Use it for English captions, subtitles, meeting translation, agent assist, and multilingual transcription.
Spanish to English speech-to-speech
Build full spoken Spanish to English translation by combining Soniox STT and Soniox TTS. Soniox recognizes Spanish, translates it, and speaks English with low latency.
Use it for live interpreters, bilingual voice agents, travel assistants, and customer support.
Live Spanish to English translation in action
Stream Spanish to English one-way to push all speech into English, or two-way to keep a bilingual conversation flowing between the two languages.
One-way translation
Translate live Spanish into English. Everyone in the conversation sees the same translated stream.
Ideal for live captions, multilingual meetings, broadcasts, lectures, and customer calls.
Two-way translation
Translate between Spanish and English for live bilingual conversation. Each side speaks naturally and hears the other in their own language.
Soniox supports real-time two-way translation between any two of 60+ supported languages.
Accurate on both ends of the pair
Soniox transcribes Spanish at 1.25% word error rate and English at 1.25% word error rate. Accurate recognition on both sides is what makes the translation reliable.
Speech-to-Text
Native-speaker accuracy across 60+ languages, with support for multilingual speech, alphanumerics, speaker diarization, context.
Translation
Real-time streaming translation across 3,600 language pairs, built for high quality and low delay across all supported languages.
Text-to-speech
High-fidelity speech generation in 60+ languages, built for names, alphanumerics, language switching, and ultra-low-latency streaming.
Together, they create a complete real-time low-latency speech AI platform.
About Spanish and English
Spanish has roughly 500,000,000 speakers across Spain, Mexico, Colombia, and Argentina. English has roughly 1,500,000,000 speakers across United States, United Kingdom, Canada, and Australia.
Spanish is the second most spoken language in the world by native speakers, after Mandarin Chinese.
English is the most widely spoken language in the world when including both native and non-native speakers.
Soniox makes Spanish to English usable in real-time translation across every supported pair.
Translate Spanish to any language
From Spanish to English, or Spanish to any of 60+ supported languages. All real-time.
Frequently asked questions
How do I translate Spanish to English with the API?
Is Spanish to English translation real-time?
What about translating English to Spanish?
Does Soniox handle Spanish dialects and accents?
Which other providers support Spanish to English?
How fast is Spanish to English translation?
Simple, usage-based pricing
Translate live audio from Spanish to English from ~$0.18/hour.
Translation is already built into Soniox Speech-to-Text API. When turned on, it adds about ~$0.06/hour in output token costs.
Ready to get started?
Create an account instantly, or contact us to design a custom package for your business.
Build with APIDocumentation
Get up and running in minutes and spend your time building the product, not wrestling with the API.
Explore docsSee what you’ll pay
Pay only for what you use with our flexible pricing. Built to scale with you.
Pricing details