**You likely already have the ID you need.** For flights entirely within the US, TSA currently accepts passports **up to two years after expiration**. If yours expires between now and your flight in two weeks, you can use that passport at the TSA checkpoint. Both US and foreign government-issued passports appear on TSA’s accepted-ID list. [TSA identification rules](https://www.tsa.gov/travel/security-screening/identification)

Getting a replacement within two weeks is less dependable:

| Option | Current timeline and requirements |
|---|---|
| **California REAL ID card** | DMV says delivery takes **3–4 weeks** after applying. A standard California ID does not meet the current flight-ID requirement, and TSA does not accept temporary driver’s licenses. [California DMV](https://www.dmv.ca.gov/portal/driver-licenses-identification-cards/identification-id-cards/), [TSA](https://www.tsa.gov/travel/security-screening/identification) |
| **US passport renewal** | Expedited processing takes **2–3 weeks, plus mailing time**. Urgent passport-agency appointments require upcoming **international travel**; a domestic flight alone does not qualify. [State Department](https://travel.state.gov/en/passports/apply/get-fast.html) |

For this trip, I’d **keep your existing passport and bring it to the airport**, then renew afterward. Mailing it away for renewal now would leave you without your only ID. The expired-passport allowance above applies to domestic TSA screening; it does not make the passport valid for international travel.