David I. Goulden
Executive Vice President and Chief Financial Officer at Booking
Thank you, Glenn, and good afternoon. I'll review our results for the third quarter as well as our thoughts for Q4 and the full year. All growth rates for 2023 are on a year-on-year basis unless otherwise indicated. We will be making some references to the comparable periods in 2019, where we think these are helpful. Information regarding reconciliation of non-GAAP results to GAAP results can be found in our earnings release. We will post our prepared remarks to the Booking Holdings Investor Relations website after the conclusion of the earnings call. Now onto our third quarter results.
We are pleased to report 15% room night growth in Q3, which was a few percentage points better than our expectations. Looking at our year-on-year room night growth by region in the third quarter, Asia was up about 35%, Rest of World was up mid-teens, Europe was up low double digits, and the U.S. was up low single digits. Compared to 2019, our Q3 global room night growth was 24%. The average booking window of Booking.com expanded in Q3 versus the same period in both 2022 and 2019 and was a bit more expanded versus the prior year periods than it was in Q2.
In Q3, our mobile apps represented over half of our total room nights for the first time ever. The Q3 mobile app mix of about 51% was about 6 percentage points higher than the third quarter of 2022. We continue to see an increasing mix of our total room nights coming to us through the direct channel. Direct channel increased as a percentage of our room nights in the third quarter relative to the third quarter of 2022. The Q3 international mix of our total room nights was over 50%, up from about 45% in the third quarter of 2022. The Q3 international mix was in line with 2019 levels, similar to the second quarter. Our cancellation rates in the third quarter were slightly higher than Q3 2022, but slightly below Q3 2019. Cancellation rates were the same as in Q2.
For our alternative accommodations at Booking.com, our Q3 room night growth was about 24% year over year and the global mix of alternative accommodations was about 33%, which was a few points higher than Q3 2022. Q3 gross bookings increased 24% year over year or 21% on a constant currency basis. The 24% increase in gross bookings was 9 percentage points higher than the 15% room night increase due to about 4% higher accommodation constant currency ADRs, plus about 3 percentage points of positive impact from FX movements, and also due to about 2 percentage points from flight bookings.
Our year-over-year ADR growth was negatively impacted by regional mix due to a higher mix of room nights from Asia and a lower mix of room nights from the U.S. Excluding regional mix, constant currency ADRs were up about 7 percentage points year on year. Despite the higher ADRs in the third quarter, we have not seen a change in the mix of hotel star ratings being booked or changes in length of stay that could indicate that consumers are trading down. We continue to watch these dynamics closely. Airline tickets booked in the third quarter were up about 57% year on year driven by the continued expansion of Booking.com's flight offering.
Revenue for the third quarter exceeded our expectations, increasing 21% year over year or about 18% on a constant currency basis. Although we had a stronger than expected Q3 from a room night and gross bookings point of view, the outperformance versus our expectations was driven mainly by bookings that offer travel in future quarters. As a result, we did not see all of the revenue benefit in Q3 from these incremental bookings. Revenue as a percentage of gross bookings in Q3 was 18.4%, which was lower than expected due to this timing effect. Our underlying accommodation take rates continue to be in line with 2019 levels.
Marketing expense, which is a highly variable expense line, increased 13% year over year. Marketing expense as a percentage of gross bookings was about 50 basis points lower than Q3 2022 due to higher ROIs in our paid channels and a higher mix of direct business. Performance marketing ROIs increased year over year helped by our ongoing efforts to improve the efficiency of our marketing spend. Marketing and merchandising combined as a percentage of gross bookings in Q3 was about 30 basis points lower than last year, which was a little better than our expectations, driven by improved performance marketing ROIs.
Q3 sales and other expenses as a percentage of gross bookings were up about 10 basis points compared with last year, a bit better than our expectations. About 51% of Booking.com's gross bookings were processed through our payments platform in Q3, up from about 40% in Q3 2022. For the total company, 56% of gross bookings were merchant, up from about 45% in Q3 2022.
Our more fixed expenses in aggregate were up 24% year over year, which was below our expectation, due to lower personnel and personnel-related expenses. We continue to manage our more fixed expenses very carefully. On a GAAP basis, our more fixed expenses were up 33% year over year, including a $90 million accrual in G&A expense for the termination fee related to the acquisition agreement for Etraveli. This accrual was excluded from our non-GAAP results.
Adjusted EBITDA was $3.3 billion in the third quarter, which was up 24% year over year, and would have been up 22% on a constant currency basis. This was also ahead of our expectations.
Non-GAAP net Income of $2.6 billion in the third quarter resulted in non-GAAP EPS of $72.32 per share, which was up 36% year over year. Our average share count in the third quarter was 9% below Q3 2022 and 16% below Q3 2019. On a GAAP basis, we had net Income of $2.5 billion in the quarter.
Now on to our cash and liquidity position. Our Q3 ending cash and investments balance of $14.3 billion was down versus our Q2 ending balance of $15.7 billion [Phonetic] due to the $2.6 billion of share repurchases we completed in the quarter, partially offset by the $1.3 billion of free cash flow generated in the third quarter. We have repurchased $7.7 billion of our shares through the first three quarters, which represents 8% of our year end 2022 share counts.
The repurchases so far this year take our combined authorization down to $16 billion from the total of $24 billion we discussed earlier in the year. Our buyback program takes into account -- takes our share price into account. And at current share price levels, we expect to spend more on buybacks in Q4 than we did in Q3. We remain comfortable with our ability to complete the full $24 billion of share repurchases within four years from when we started the program at the beginning of this year, assuming no major downturn in the travel environment.
Now onto our thoughts for the fourth quarter of 2023. In October, we estimate year-over-year room night growth was about 8%, down from 15% in Q3 due in part to a tougher year-on-year compare, as well as the war in the Middle East. When comparing versus 2019, October room night growth was about 20%. Excluding Israel, October room nights grew about 9% versus 2022 and about 22% versus 2019. The 22% growth versus October 2019, excluding Israel, is a little lower than the 24% growth we saw in Q3 versus 2019.
Looking across our major regions. In October, we saw Asia year-on-year growth of room nights with about 15%, Europe up about 10%, and the U.S. and Rest of World were down slightly. The impact of the Israeli-Hamas war is seen most in the Rest of World growth numbers. Israel on a booker plus inbound travel basis is about 1% of our global room nights. The Middle East, including Turkey and Egypt, on a booker basis is about 4% of our global room nights.
Globally, we saw a slowdown starting the second week of October due to cancellations and a drop in new bookings after the start of the war in the Middle East. The cancellations we saw started in the second week of October were concentrated in Israel, but we also saw some impact on travel trends outside of the country as people absorbed the news. We were pleased to see room night growth recover towards the end of the month.
Our comments for the fourth quarter make the assumption that room night growth will be up about 9% year on year. When comparing versus 2019, this means we expect Q4 room night growth to be about 20%. This outlook assumes there is no further expansion of the war in the Middle East.
We expect Q4 gross bookings to grow about 5 percentage points -- about 5 points faster than room nights on a year-on-year basis due to a couple points from higher accommodation constant currency ADRs, including some pressure from changes in regional mix, as well as a couple points from continued flight bookings growth. We expect Q4 revenue as a percentage of gross bookings to be about 15%, which would be higher than Q4 last year due to benefits from timing.
We expect Q4 marketing expenses as a percentage of bookings -- gross bookings to be slightly lower than last year. We expect marketing and merchandising combined as a percentage of gross bookings in Q4 to be slightly higher than last year as we continue to look for opportunities to lean in. We expect Q4 sales and other expenses as a percentage of gross bookings to be about in line with last year as the higher merchant gross bookings mix is offset by efficiencies in payments costs. We expect our more fixed expenses in Q4 to grow a couple of points faster year over year than it did in the third quarter. Taking all this into account, we'd expect Q4 adjusted EBITDA to be just over $1.4 billion.
Our year-to-date results plus our fourth quarter commentary means that, for the full year, we expect room nights to grow in the mid-to-high teens year over year. We currently expect full year gross bookings growth of over 20% year on year. We currently expect revenue as a percentage of gross bookings to increase year on year by about 10 basis points, down from our previous expectation for a 20 basis point increase due to higher bookings growth and a longer booking window, which will reduce the expected benefit from timing.
We continue to expect full year marketing and merchandising as a percentage of gross bookings to be slightly below 2022, and for our more fixed expenses to grow around 25% year over year. We manage our more fixed costs very carefully and continue to expect our more fixed expenses next year to grow at an appreciably lower rate than this year. We continue to expect that our adjusted EBITDA margins will expand by a couple of percentage points versus 2022.
In closing, we are pleased with our Q3 results, the trends we are seeing into Q4 and with the bookings we have already received for early 2024.
We'll now move to Q&A. So Baily, can you please open the lines?