The regular public offer is 20k points after $1,000 spend within 90 days of approval. This offer is double that with the same spend. It is available via this link at nerdwallet.
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Find this offer by doing a search for a flight on united.com From United.com: $400 statement credit after first purchase and 25,000 bonus miles after you spend $3,000 on purchases in the first 3 months your account is open.* Plus, earn 10,000 bonus miles after
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The most direct flights are typically SFO to DEL or BOM on Air India. The first step is to get the required points. The main partners to book Air India for this route are United and Air Canada. Typically, it takes 88k United Mileage Plus points or 90k Air Canada