The best time to book flights for most US domestic trips is roughly one to two months before departure, and for international trips roughly two to four months out. Google Flights data puts the typical domestic sweet spot at about 39 days ahead and international at about 89 days, while the day of the week you actually click “buy” makes very little difference. What matters far more is the day you fly, the month you travel and whether you track prices instead of booking on impulse.
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If you are flying to meet a cruise, there is an extra layer: getting the cheapest fare is pointless if it leaves you racing the ship. This guide covers the latest 2026 booking data, the myths worth ignoring and the cruise-specific choices most flight guides skip.
Best time to book flights: what the 2026 data says
Several big data sets were updated during 2026, and while their exact numbers differ, they point in the same direction: book neither very early nor at the last minute.
| Source (2026 update) | Domestic US | International |
|---|---|---|
| Google Flights (October 2026) | About 39 days ahead (low-price range 22 to 57 days) | About 89 days ahead (range 50 to 133 days) |
| Expedia Air Hacks report (2026) | 15 to 30 days ahead, saving around $130 on average versus booking 6+ months out | Not broken out in the US summary |
| KAYAK (updated March 2026) | About 21 to 30 days ahead, average around $228 round trip | Lowest average in its data came close in, but with fewer seats and less choice |
| Forbes Advisor (April 2026) | 34 to 86 days ahead | Earlier than domestic |
| NerdWallet (August 2026) | 1 to 3 months ahead | 2 to 8 months ahead |
A sensible rule that fits all of these: start watching domestic fares around three months before you travel and aim to buy somewhere between three and eight weeks out. For international trips, start watching five to six months ahead and aim to buy two to four months before departure. KAYAK’s figures suggest international fares can occasionally dip late, but relying on that is a gamble, especially when you have a fixed date such as a cruise embarkation.
Holiday and peak-season booking windows
Google’s October 2026 insights also break the advice down by season. These are typical lowest-price points, not guarantees:
- Thanksgiving: about 34 days ahead (range 21 to 57 days).
- Christmas: about 56 days ahead (range 33 to 67 days).
- Spring break (March or April): about 50 days ahead.
- Summer (July or August): about 21 days ahead, though popular routes can sell out earlier.
- Mexico and the Caribbean: about 43 days ahead (range 24 to 69 days), which is useful for anyone flying to a Florida, Texas or Puerto Rico cruise port.
- Europe: 49 days or more ahead.
Is Tuesday the best day to book flights?
No. The idea that airlines release cheap fares on Tuesday afternoons comes from an era when fares were filed manually in batches. Today airline pricing is dynamic and changes constantly. KAYAK calls the Tuesday rule “simply not true”, and Google’s own multi-year analysis found that the day you book makes only a tiny difference on average. The best day to book a flight is simply the day you see a good fare for your dates.
The same applies to clearing cookies or searching late at night. There is no reliable evidence that either changes the price you are shown. Your time is better spent comparing dates and airports.
Cheapest days to fly (this is what actually matters)
While the booking day barely matters, the day you travel does:
- Domestic: Expedia’s 2026 data names Tuesday as the cheapest and least busy day to fly, with Sunday typically the most expensive. KAYAK found Monday departures and Wednesday returns cheapest in its data.
- International: KAYAK’s data points to midweek (Wednesday) departures and returns as the cheapest.
- Time of day: very early morning flights and red-eyes are often cheaper, and early flights are less likely to be delayed.
Cheapest months to fly
Expedia’s 2026 report found January to be the cheapest month for US domestic flights, with fares around 19% lower than December. More broadly, prices tend to rise in summer (June to August), Thanksgiving week, Christmas to New Year, spring break and three-day holiday weekends. Late January, February (outside Presidents’ Day), early May, September and early November are usually better value. That lines up nicely with the cruise shoulder seasons, when cruise fares can also be lower.
Use price alerts instead of guessing
Because no single day is magic, the most reliable way to catch a low fare is to track it. Set alerts as soon as your dates are firm, ideally two to four months before travel.
- Google Flights: turn on price tracking for your route and dates, and check the price graph and date grid to see whether today’s fare is low, typical or high. Our step-by-step guide to finding cheap flights on Google Flights walks through every setting.
- KAYAK: offers price alerts plus a price forecast that suggests whether to book now or wait.
- Hopper and other apps: use fare predictions to advise when to buy. Treat any prediction as guidance, not a promise.
- Airline apps and emails: sign up for sale alerts from carriers that serve your home airport, as flash sales sometimes undercut the search engines briefly.
Once you have a fare you are happy with, book it. Waiting for an extra $20 saving can backfire on popular dates. Also remember that most US airlines no longer charge change fees on main cabin fares, so if the price drops after booking on those fares you may be able to rebook and receive a travel credit for the difference. Basic economy fares usually do not allow this, so check the rules.
Other quick ways to save
- Compare nearby airports. Expedia’s 2026 data lists Fort Lauderdale, Orlando and Las Vegas as among the cheapest US departure airports, roughly 25% below the national average.
- Search one-ways on different airlines, which can beat a round trip.
- Price the full cost, including bags and seats. A cheap basic fare with two checked bags can cost more than a standard fare.
- Use points or miles for peak dates, when cash fares are highest.
Best time to book flights for a cruise
This is where cruise passengers need different rules. A missed flight on a city break is an annoyance. A missed flight before a cruise can mean chasing the ship to the next port at your own expense, or missing the trip entirely.
Fly in the day before embarkation
The cheapest fare on embarkation morning is rarely the best value. Flying in the day before (or two days before for international cruises or winter trips through snowy hubs) gives you a buffer for delays, cancellations and lost bags. The hotel night costs money, but it is usually far less than flying out to meet the ship at a later port. Book your pre-cruise flight in the normal booking window, but treat it as a fixed date: do not shift it to embarkation day just to save a little.
Choose the right airport too. For Florida departures, for example, compare the options in our guide to airports near Port Canaveral, since a cheaper fare into a more distant airport can be cancelled out by transfer costs.
On the way home, avoid flights departing before about midday on disembarkation day. Ships often clear later than planned, and US Customs queues can be long after a big ship arrives.
Open-jaw tickets for one-way cruises
Many cruises, such as transatlantic crossings, Alaska one-ways, Panama Canal transits and European itineraries, start and finish in different cities. Booking two separate one-way tickets can be expensive, particularly on international routes. An open-jaw ticket (fly into one city, home from another) priced as a single booking is often much cheaper. Use the multi-city search on Google Flights or KAYAK to compare.
Airline tickets versus cruise-line air programs
Most big lines now sell flights alongside the cruise. Royal Caribbean’s program is called Flights by Royal, and Celebrity runs Flights by Celebrity. Here is how the two approaches compare:
| Factor | Booking directly with an airline | Cruise-line air program |
|---|---|---|
| Price | Often cheapest if you track fares and book in the sweet spot | Can be competitive, especially for open-jaw and international routes; compare before booking |
| Flight choice | Any flight, any time | Usually limited to pre-selected timings that build in a buffer |
| Delays and missed embarkation | You are responsible for reaching the ship | The line typically helps get you to the ship or next port; Royal Caribbean advertises a guaranteed arrival promise |
| Loyalty miles and seats | Full control of seats, upgrades and miles | Miles may still be earned; seat selection can depend on the fare |
| Booking window | Normal airline window (often up to about 11 months) | Royal Caribbean allows booking up to 330 days ahead |
As a rule of thumb, booking independently tends to suit confident travelers who fly in the day before. A cruise-line program is worth pricing for complicated international itineraries, open-jaw trips or same-day arrivals, where the protection has real value. Always read the program’s terms on the cruise line’s site, as refund levels and change rules vary.
If you are still choosing the cruise itself, it pays to line up both purchases. Watch our roundup of the best cruise deals for 2027, then set flight alerts as soon as your sailing is confirmed, so you are watching fares well before the sweet spot arrives.
A simple booking timeline
- When you book the cruise: set flight price alerts for the day before embarkation and for your return.
- Five to six months out (international) or three months out (domestic): check the price graphs and get a feel for normal fares.
- Two to four months out (international) or three to eight weeks out (domestic): book when a fare looks low or typical for the route.
- Peak dates (Christmas, spring break, summer): lean towards the earlier end of the window.
- After booking: keep an eye on the fare and rebook if your ticket type allows a credit for a lower price.
If you fly in a day early for a Florida sailing, here are the best things to do near Port Canaveral before boarding.
FAQs
Do flight prices go down every Tuesday?
No. Airlines use dynamic pricing that changes all week, and recent analyses from Google and KAYAK show the day you book makes little or no difference. Flying on a Tuesday or Wednesday is more likely to save money than booking on one.
Do flight prices go down at night?
There is no consistent evidence that searching or booking at night is cheaper. Red-eye and very early flights themselves are often cheaper to fly, but the time of day you buy does not reliably change the fare.
Do flight prices ever go down closer to the date?
Sometimes, especially on quieter routes, but prices usually climb in the last two to three weeks before departure. For fixed dates such as a cruise, it is safer to book within the normal booking window.
What is the cheapest day of the week for booking flights?
There is no reliably cheapest day to book flights. The cheapest days to fly are typically midweek, with Tuesday the cheapest domestic day in Expedia’s 2026 data and Sunday usually the most expensive.
How far in advance should I book international flights?
Google Flights data suggests about 89 days, with low prices typically between 50 and 133 days out. Aim for two to four months ahead, and earlier for peak holidays.