Straight answer: the best offline puzzle games for planes are the ones you download and test on the ground first, because most “offline” apps quietly need a signal for ads, saves or daily streaks. My go-to list is Sudoku.com’s offline pack, 2048, Flow Free, Two Dots, a downloaded NYT Crossword puzzle, and a paperback puzzle book as backup because batteries don’t care how good your app is.
Why “offline” on the app store is a bit of a lie
I fly a lot. UK to Israel, Israel to the US, back and forth to run workshops and speak at conferences, and I’ve had more delayed flights this year than I’d like to admit. So I’ve tested a lot of puzzle apps in real conditions: dead wifi, turned-off cellular data, dying battery, tray table up, the works.
Here’s the bit most “best offline games” round-ups don’t tell you. A huge number of apps labelled “offline mode” still try to phone home. They want to check for ads, sync your streak, or validate your subscription. If they can’t reach a server, some of them freeze, throw an error, or reset your progress. I found this out the hard way on a Tel Aviv to London flight when a puzzle app I’d used for three weeks lost my entire streak because it couldn’t verify it mid-air. Not the end of the world, but annoying enough that I now test every single game in airplane mode before I trust it with a six-hour flight.
So the real skill here isn’t finding a list of names. It’s knowing how to check, in advance, that a game will work with zero signal for the whole flight.
The one step to do before you board
Do this the night before, not at the gate:
- Turn your phone to airplane mode at home.
- Open every puzzle app you’re planning to use.
- Play a full round or level of each one.
- Close and reopen the app while still in airplane mode.
- If it loads fine and lets you play again, it’s offline. If it hangs, spins, or shows a “check your connection” message, delete it and pick something else.
This takes about ten minutes and it’s the single thing that separates a good flight from a frustrating one. I do this the night before every trip now, without fail.
The offline apps that have earned a permanent place on my phone
These have all passed the airplane-mode test on more than one flight:
- Sudoku.com – download the “offline packs” from within the app before you fly. Hundreds of puzzles, four difficulty levels, no connection needed once loaded.
- 2048 – tiny app, loads instantly, works completely offline out of the box. Good for short bursts during turbulence when you can’t concentrate on anything longer.
- Flow Free – connect the coloured dots without crossing lines. Hundreds of free levels built into the app, no download step needed.
- Two Dots – relaxing, works offline once the first batch of levels has loaded, which happens automatically on first open.
- Chess offline puzzle packs – most chess apps have a “puzzles” or “tactics” section you can pre-download. I play these on the way to a client meeting because it feels like I’m thinking, not just tapping.
- NYT Crossword – download the day’s puzzle over wifi before boarding. Once it’s saved, it stays saved with no connection at all.
If you’re on Android and want a wider tested list beyond puzzles, I put together a full rundown of offline Android games after a stretch of delayed flights where I tried nearly everything in the Play Store looking for things that wouldn’t need a signal.
The uncomfortable bit nobody in this niche wants to say
Most “brain training” puzzle apps oversell what they do. In 2016 the FTC fined Lumosity two million dollars and made them stop claiming their games would improve school and work performance, because they couldn’t back it up. That doesn’t mean puzzles are useless on a plane, they’re brilliant for killing three hours over the Atlantic, but don’t kid yourself that Sudoku on your phone is doing something magic for your memory. It’s entertainment. Treat it as entertainment and you’ll enjoy it more, not less.
You can read the FTC’s own summary of that case on the FTC website if you want the actual detail.
Why I still pack paper
Here’s my contrarian bit. I still carry a physical puzzle book on every long flight, and I think most people who fly regularly should too. Reasons, plainly:
- Batteries die. A puzzle book doesn’t need charging at 35,000 feet with no power socket, which is still most short-haul economy seats even in 2026.
- No app crashes, no forced updates, no “sign in to continue” screen right when you finally have time to play.
- You can do it during takeoff and landing when phones have to be stowed.
- Cheap. A decent crossword or Sudoku paperback is around £3 to £5 in most UK airport shops, less if you buy one before you leave home.
I keep a slim WHSmith puzzle book in my laptop bag permanently now. It’s saved me more than once, including a five-hour tarmac delay out of Luton where every phone around me was on 2% battery and mine was one of them.
My actual carry-on puzzle kit
For anyone who wants the exact setup rather than a vague suggestion, this is what’s in my bag on a typical trip:
- One paperback puzzle book, mixed Sudoku and crossword
- Phone with 2048, Flow Free, Sudoku.com offline packs and a downloaded NYT crossword, all pre-tested in airplane mode
- A small magnetic travel chess set for long-haul flights, the folding kind that fits in a jacket pocket
- A portable battery pack, because even offline games need a charged phone eventually
If I’ve got the laptop out because there’s a power point at my seat, that’s when I switch to something a bit longer, and I’ve written up a list of free PC games that need no download for exactly that situation, useful for anyone who wants to swap between a puzzle app and something with a bit more depth on a nine or ten hour flight.
What to skip
A few categories that sound good but let you down on planes:
- Any word game that syncs against a live dictionary server, like most multiplayer word apps. They’ll refuse to validate words with no signal.
- Daily challenge apps that lock you out until midnight your usual time zone. Flying across time zones confuses them and some will just show a blank screen.
- Anything that opens with a full-screen ad by default. If it needs an ad server to load before the game, it needs a connection, full stop.
Test everything the night before. It’s ten minutes of your evening against three hours of a frozen app somewhere over Greenland.
I have written more around this on the site: Free PC Games That Need No Download (What Works in 2026), Best Free Offline Games for Android in 2026 (Tested on Delayed Flights and Dead Wifi).
Frequently asked questions
Do offline puzzle games use battery faster than other apps?
Not usually. Simple puzzle apps like Sudoku or 2048 use far less battery than anything with video, sound effects on loop, or GPS. The bigger battery drain on a flight is usually the screen brightness, not the game itself. Turn brightness down and you’ll get hours more play from the same charge.
Will offline games work in airplane mode with wifi turned on?
Yes, if the game is truly offline, airplane mode with wifi on and off shouldn’t make a difference once the puzzles are downloaded. If an app behaves differently depending on whether wifi is toggled on inside airplane mode, that’s a sign it’s quietly checking a server, and worth testing before you rely on it for a long flight.
Are physical puzzle books better than apps for flights?
For reliability, yes. A paperback never crashes, never needs charging, and works during takeoff and landing when devices have to be stowed. Apps are better for variety and difficulty settings. Most frequent flyers I know, myself included, carry both.
What’s the best free offline puzzle app for a long flight?
Sudoku.com and Flow Free are the two I’d recommend first, both free, both work fully offline once you’ve opened them and let the levels load with wifi on the ground. Download a batch of at least twenty puzzles before you board so you’re not stuck if the flight runs long.
Related reading: The Best Offline Games for a Break from Screens (Tested on Real Delayed Flights and Real Bored Kids) and Free Multiplayer Games That Work on Any Laptop, Including the Slow Ones.
