Lie-flat seats and Polaris service sound expensive — but the cheapest way to upgrade to business class on United is often far less than buying a business fare outright. With the right method and timing, you can stretch out on a long-haul flight for a fraction of the sticker price. Here's how to do it.
Want us to find the lowest business-class upgrade on your route? Call +1 (855) 302-0422 (24/7) and our agents will compare every option for you.
FareDeal is an independent travel agency, not United Airlines, and is not affiliated with or endorsed by United. Upgrade availability and pricing are set by the airline; we help you find and request the best deal.
The cheapest ways to upgrade to business class on United
- PlusPoints upgrades — Premier members can use PlusPoints to upgrade eligible fares into Polaris, often the best value.
- Mileage upgrades — use MileagePlus miles (sometimes with a co-pay) on eligible tickets.
- Paid upgrade offers — United frequently offers a discounted cash upgrade after booking.
- Last-minute / day-of upgrades — often the lowest cash price when seats stay empty.
- Upgrade bid programs — on some fares you can offer what you're willing to pay.
Comparing the methods
| Method | Typical cost | Best for |
|---|---|---|
| PlusPoints | Points + possible co-pay | Premier members, long-haul |
| Miles upgrade | Miles + co-pay | Mileage holders on eligible fares |
| Paid upgrade offer | Varies widely by route/demand | Anyone, after booking |
| Day-of / gate upgrade | Often the lowest cash rate | Flexible flyers |
| Upgrade bid | Your offer (if accepted) | Bargain hunters |
Pricing varies by route, demand, and fare and changes often — call to confirm what's open on your flight.
How to land a cheap business upgrade
- Book an upgrade-eligible fare — Basic Economy can't be upgraded.
- Watch for paid upgrade offers in your trip details after booking.
- Compare cash vs PlusPoints vs miles — the cheapest varies by route.
- Be flexible near departure — last-minute deals reward flexibility.
- Confirm your lie-flat seat once the upgrade clears.
Business vs first class on United
On long-haul international routes, Polaris business is United's top cabin. On domestic flights, the premium cabin is United First — a different product. If you're flying domestically, see how to upgrade to first class on United instead.
If you'd rather skip the upgrade
Not every upgrade is worth the cost. A well-chosen Economy Plus seat can be plenty for shorter trips — see United economy seat selection fees. And since fares and upgrade pricing both move with timing, check the best time to book a flight for the cheapest fare before you commit.
What Polaris business class includes
On long-haul international routes, a business-class upgrade buys a genuinely different experience. United Polaris typically includes:
- Lie-flat seats with direct aisle access on most aircraft.
- Priority check-in, security, and boarding.
- Polaris lounge access at select hubs before departure.
- Multi-course meals, premium bedding, and amenity kits.
- Generous baggage allowance and priority delivery.
On an overnight transatlantic or transpacific flight, arriving rested can be worth far more than the upgrade cost — which is exactly why hunting for a cheap upgrade pays off.
Cash vs miles: which is the better deal?
There's no single answer — it depends on the route and how you value your miles. A quick way to decide:
- Estimate the cash upgrade price United is offering.
- Estimate the miles + co-pay for the same seat.
- Divide the cash saved by the miles spent to get a cents-per-mile value.
- If that value beats roughly 1.5–2 cents per mile, the miles upgrade is usually worth it.
- If not, pay cash and save your miles for a better redemption.
We run this comparison routinely — call and we'll tell you which is the smarter spend on your flight.
Ready to fly flat for less? Call +1 (855) 302-0422 (24/7) and we'll find the cheapest business-class upgrade on your United flight — or help with a fresh United booking at the same time.