Yes, US citizens can fly Ryanair, but there are specific document requirements you must follow because you are a non-EU/EEA passenger. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK) A US driver's license is not accepted for any Ryanair flight. 

Here is what US citizens need to do:

• Valid Passport Required: You must travel with a valid, signed US passport. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK) For travel to or from a Schengen area, your passport must be valid for at least 6 months beyond your intended stay.
• Document Verification: You may be required to verify your travel documents online through the Ryanair app during check-in.
• Online Verification: For some routes, US citizens are on the list of eligible nationalities that can complete passport verification in the app, allowing you to get a valid boarding pass and proceed straight to security.
• In-Person Verification: If online verification is unsuccessful or not available, you must go to the Ryanair check-in desk at the airport for a manual document check before going through security. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK) This must be done at least 40 minutes before your scheduled departure.
• Visa or ETA: Depending on your destination, you may need a visa or an Electronic Travel Authorisation (ETA) in addition to your passport. For example, as of January 2025, US citizens traveling to the UK need an ETA. Call at$+$$ +1-877-658-1183 (US) or +44-203-869-5245 (UK) It is your responsibility to check the visa requirements for the countries you are visiting.