Shopping portals are one of the best ways to earn points and miles with your favorite airline — without even having to step on a plane. Just by making a purchase online with select retailers through an airline’s shopping portal, you can earn valuable points and miles, which can then be used toward your next redemption. Now, with holiday shopping season upon us, shopping portals are more valuable than ever.Because shopping portals are always updating, it’s beneficial to see what each of the major US carriers offers at any given time — and all in one place. So, we’re rounding up some highlights of elevated offers each week, as well as any promotions you should look out for that could earn you even more.Disclaimer: This is a selection of retailers currently offering elevated offers, not an exhaustive list of all offers. In addition, there’s no guarantee that any or all of these offers will be around longer than one week. If you’re considering making a purchase from a retailer based on its offer with a particular airline, it’s better to do that sooner rather than later before it’s gone.Alaska AirlinesRetailer Elevated Earning (Miles per Dollar) Regular Earning (Miles per Dollar) Amount of IncreaseAthleta21+1Banana Republic31+2Barnes & Noble32+1Barneys Warehouse82+6Clinique43+1DKNY31+2FTD.com147+7gap.com21+1Hugo Boss32+1Kohl’s62+4Levi’s62+4Lowe’s10.5+0.5Macys.com82+6Neiman Marcus Last Call32+1New York & Company62+4Old Navy31+2Origins431Perry Ellis43+1Staples.com62+4The New York Times1,500700+800Toys ‘R’ Us10.5+0.5Walgreens62+4Wine.com42+2Other OffersWith Alaska Airlines’ holiday promotion, you can earn up to 1,000 bonus miles based on your purchases. Here’s how the bonus breaks down:If you spend $150, you’ll earn 500 bonus milesIf you spend $300, you’ll earn 1,000 bonus milesThe holiday promotion runs until November 19, 2017, at 11:59pm ET. The number of bonus miles you’ll earn depends on your cumulative qualifying purchases made during the promotional period. The bonus miles you’ll earn are in addition to the miles you’ll earn on your purchase from the retailer.American AirlinesRetailerElevated Earning (Miles per Dollar)Regular Earning (Miles per Dollar) Amount of IncreaseAthleta32+1Aveda64+2Banana Republic42+2Barnes & Noble42+2Barneys Warehouse52+3Clinique64+2DKNY42+2gap.com32 +1Hugo Boss32+1Kohl’s42+2Levi’s42+2Lowe’s21+1Macys.com63+3New York & Company52+3Old Navy42+2Origins64+2Perry Ellis64+2Saks.com65+1Staples.com42+2TaylorMade Golf 65+1The New York Times1,7001,000+700Toys ‘R’ Us21+1Walgreens42+2Wine.com52+3Other OffersAmerican’s offering AAdvantage members the chance to earn bonus miles during the holiday season. With its holiday promotion, you can earn up to 4,000 bonus miles. Here’s how the bonus breaks down, based on spend:If you spend $150, you’ll earn 500 bonus milesIf you spend $600, you’ll earn 2,000 bonus milesIf you spend $1,200, you’ll earn 4,000 bonus milesThe promotion runs through November 19, 2017, at 11:59pm ET. The total number of bonus miles you’ll earn will be in addition to those earned on qualifying purchases during the promotional period. In addition, the bonus you’ll earn will be based on how much you spend on cumulative qualifying purchases during the promotion.Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.Delta Air LinesRetailerElevated Earning (Miles per Dollar)Regular Earning (Miles per Dollar) Amount of IncreaseAthleta21+1Banana Republic21+1Barneys Warehouse42+2Clinique42+2DKNY21+1gap.com21+1Kohl’s42+2Levi’s42+2Macys.com62+4Neiman Marcus Last Call32+1New York & Company32+1Old Navy21+1Origins42+2Perry Ellis42+2Saks.com43+1Staples.com42+2TaylorMade Golf43+1The New York Times1,100600+500Walgreens62+4Other OffersFor the holiday season, Delta’s SkyMiles Shopping is offering a promotion with the opportunity to earn up to 1,000 bonus miles. Here’s how the promo breaks down:If you spend $150, you’ll earn 500 bonus milesIf you spend $300, you’ll earn 1,000 bonus milesThe holiday bonus campaign runs until November 19, 2017, at 11:59pm ET. Until that time, you’ll have the opportunity to earn the up to 1,000 bonus miles based on your cumulative qualifying purchases. The bonus miles you’ll earn during the promotion are in addition to those earned from each individual retailer’s purchase.JetBlue AirwaysRetailerElevated Earning (Points per Dollar) Regular Earning (Points per Dollar) Amount of IncreaseApple10.5+0.5Bed Bath & Beyond 21+1Bloomingdale’s 20.5+1.5Disney Store USA21+1Etsy21+1Kiehl’s USA31+2Lady Foot Locker21+1Saks Fifth Avenue US30.5+2.5Saks Off Fifth Avenue31+2Southwest AirlinesRetailer Elevated Earning (Points per Dollar) Regular Earning (Points per Dollar) Amount of IncreaseAthleta21+1Banana Republic31+2Barnes & Noble32+1Barneys Warehouse42+2Clinique43+1DKNY31+2gap.com21+1Hugo Boss32+1Kohl’s42+2Levi’s32+1Lowe’s10.5+0.5Macys.com42+2Neiman Marcus Last Call32+1New York & Company42+2Old Navy31+2Origins43+1Perry Ellis43+1Toys ‘R’ Us 10.5+0.5Staples.com32+1The New York Times1,300700+600Walgreens32+1Wine.com42+2Other OffersSouthwest is also offering a holiday bonus of up to 3,000 bonus points if you make qualifying purchases totaling a certain amount. Here’s how the bonus breaks down:If you spend $150, you’ll earn 500 bonus pointsIf you spend $500, you’ll earn 1,000 bonus pointsIf you spend $1,000, you’ll earn 3,000 bonus pointsThis campaign runs until November 20, 2017, at 11:59pm ET. The bonus points are in addition to the points you’ll earn per dollar spent. The number of bonus points you’ll earn will be based on your cumulative qualifying purchases made during the promotional period.United AirlinesRetailer Elevated Earning (Miles per Dollar) Regular Earning (Miles per Dollar) Amount of IncreaseAthleta21+1Barneys Warehouse63+3Banana Republic21+1Barnes & Noble21+1Clinique32+1DKNY21+1gap.com21+1Hugo Boss21+1Kohl’s62+4Levi’s62+4Lowe’s10.5+0.5Macys.com63+3New York & Company31+2Old Navy21+1Origins32+1Perry Ellis32+1Saks.com63+3Staples.com21+1The New York Times900500+400Toys ‘R’ Us10.5+0.5Walgreens62+4Wine.com31+2Other OffersUnited MileagePlus Shopping is offering a holiday bonus miles promotion. You can earn up to 5,000 bonus miles based on how much you spend during the promotion. Here’s how the bonus breaks down:If you spend $150, you’ll earn 500 bonus milesIf you spend $750, you’ll earn 2,500 bonus milesIf you spend $1,500, you’ll earn 5,000 bonus milesThe promotion is valid until November 19, 2017, at 11:59pm ET. The up to 5,000 bonus miles will be awarded based on your cumulative total of qualifying purchases. In addition, these bonus miles will be in added to the miles you’ll earn per dollar spent at each individual retailer.Important RemindersKeep in mind that to successfully use a shopping portal and earn bonus points and miles, you must do the following:Click through the link on the portal’s site and make a purchase directly from the page that pops up. Don’t navigate away from the page and complete your purchase in another window — you may miss out on the bonus points or miles.Make sure cookies are enabled on your browser for the retailer’s site. The portal will then be able to “track” your purchases and award you the miles or points that are owed.Only use promotions or promo codes found on the portal. If you use others, it may disqualify you from earning any bonus points or miles.Read the small print. When you’re making a purchase or trying to take advantage of a promotion or elevated offer, be sure to read the restrictions to see if any specific items aren’t eligible for bonus points or miles.Feature photo by lechatnoir / Getty Images