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Once upon a time, the majority of loyalty-rewards points were earned for traveling. No more. Today, more points are earned for credit-card purchases than for flying or staying in hotels or, well, for anything. Which explains why today's frequent-flyer programs are more accurately referred to as frequent-buyer programs.

When it comes to racking up credit-card points, the single largest trove of points is likely to be the new cardmember bonus offered by the card issuer to new cardholders who meet certain requirements, typically meeting a spending target within a set period.

In recent years, such bonuses have occasionally topped 100,000 miles, and anything less than 50,000 miles is generally considered a yawner by consumers who zealously monitor limited-time bonus offers in pursuit of the most generous payouts. The offers are in constant flux, rising and falling as market conditions change and card issuers' goals evolve.

With that in mind, the following is our monthly roundup of the biggest sign-up bonuses currently on offer for the most popular travel-rewards charge and credit cards.

Citi / AAdvantage Platinum Select World Elite Mastercard

Welcome offer: 50,000 miles after spending $2,500 within the first 3 months of account opening.

Annual fee: $95, waived the first year.

Comment: A popular card, linked to the world's largest airline's loyalty program.

*Disclosure: Citi is an Airfarewatchdog advertiser.

Citi / AAdvantage Executive World Elite MasterCard

Welcome offer: 75,000 miles after spending $7,500 within the first 3 months of account opening.

Annual fee: $450.

Comment: The high-end AAdvantage card comes bundled with a long list of travel perks, including annual lounge membership. 

British Airways Visa Signature Card

Welcome offer: 50,000 Avios after spending $3,000 within the first 3 months of account opening, plus an additional 25,000 Avios after spending $10,000 in the first year, plus an additional 25,000 Avios after spending $20,000 in the first year.

Annual fee: $95.

Comment: So, there's the potential to earn 100,000 miles after spending $20,000 within 12 months of account opening.

United MileagePlus Explorer Visa Signature Card

Welcome offer: 50,000 miles after spending $3,000 within the first 3 months of account opening.

Annual fee: $95.

Comment: Perks include free first checked bag, priority boarding, two lounge passes, unrestricted access to award seating. Offer expires July 31.

Wyndham Rewards Visa Signature Card

Welcome offer: 30,000 points after the first purchase, plus an additional 15,000 points after spending $2,000 within the first 3 months of account opening.

Annual fee: $75.

Comment: The 45,000-point sign-up bonus is enough for 3 free nights at any Wyndham property. Cardholders receive Platinum elite status in the Wyndham Rewards program.

Marriott Rewards Premier Credit Card from Chase

Welcome offer: 80,000 points after spending $3,000 within the first 3 months of account opening, plus an additional 7,500 points for adding an authorized user who uses the card within 3 months.

Annual fee: $85.

Comment: Good program, solid card, big bonus.

The Platinum Card from American Express

Welcome offer: 60,000 Membership Rewards points after spending $5,000 within the first 3 months of account opening.

Annual fee: $550.

Comment: While the card's annual fee is among the very highest, it also comes bundled with a robust set of travel perks, including lounge access, $200 statement credit for bag fees, and 5 points per $1 for flights booked direct with American Express.

Chase Sapphire Preferred Card

Welcome offer: 50,000 points after spending $4,000 within the first 3 months of account opening, plus an additional 5,000 points for adding an authorized user who uses the card within 3 months.

Annual fee: $95, waived the first year.

Comment: Ultimate Rewards points can be transferred into a number of airline and hotel programs, as well as redeemed for travel through the Ultimate Rewards portal. In the latter case, 50,000 points are worth $625.

Starwood Preferred Guest Credit Card from American Express

Welcome offer: 25,000 points after spending $3,000 within the first 3 months of account opening. 

Annual fee: $95, waived the first year.

Comment: While the bonus itself is comparatively modest, Starwood points are among the most valuable loyalty currencies, as they're transferable to 30-plus airline frequent flyer programs, mostly on a 1:1 basis, and there's a 5,000-point bonus when transferring 20,000 points to a participating airline program.

Many of the above-listed consumer cards are also available as business cards, sometimes featuring the same sign-up bonuses. That means it's possible to double up on the bonuses if you're eligible for a business as well as a consumer card.

Editor's Note: This content is not provided by any bank, credit card issuer, airline, or hotel chain. Any opinions, analyses, reviews or recommendations expressed here are those of the author's alone, and have not been reviewed, approved, or otherwise endorsed by the aforementioned entities.

All products and services mentioned on Airfarewatchdog are independently selected by our team of expert travelers. If you buy something through our links, we may earn an affiliate commission.

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