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 second quarter as well as our thoughts for Q3 and for the full year. All growth rates for 2023 are on year-over-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 second quarter results. Against the tough year-over-year comparison in the second quarter due to the strong rebound in travel after Omicron in Q2 last year, we were pleased to have delivered 9% room night growth in Q2, which was a few percentage points better than our expectations. Looking at our year-over-year room night growth by region in the second-quarter, Asia was up over 40%, rest of world was up low-double-digits, Europe was up a couple of points, and the U.S. was down slightly. It's helpful to remember that the U.S. was very strong last Q2 and stronger than Q1 and Q3 versus 2019 due to the rebound from Omicron. Compared to 2019, our Q2 global room night growth was 26%, which was in line with Q1. For the second quarter, all our major regions grew at a similar rate versus 2019 revenue.
In Q2, the booking window at Booking.com expanded further versus 2019 than it did in Q1. The Q2 booking window at Booking.com also expanded versus 2022. As Glenn mentioned, our mobile apps represented about 48% of our total room nights in the quarter, which is about 6 percentage points higher than the second quarter of 2022. We continued to see an increased mix of our room nights coming to us through the direct channel. The direct channel increased as a percentage of our room nights in the second quarter relative to the second quarter of 2022.
For the first time since the onset of the pandemic, in Q2, we saw the international mix of our room nights fully recover to 2019 levels. Our cancellation rates in the second quarter were higher than Q2 2022, as the second quarter of 2022 benefited from the strong recovery in new bookings, following the relaxation of travel restrictions in many parts of the world post Omicron. Our cancellation rates in the second quarter continued to be below 2019 levels. For our alternative accommodations at Booking.com, our Q2 room night growth was about 11% year-over-year and the global mix of alternative accommodation room nights was about 34%, which was higher than about 32% in Q2 2022. Versus 2019, alternative accommodation room night growth was about 38%.
Q2 gross bookings increased 15% year-over-year, or 16% on a constant-currency basis. The 15% increase in gross bookings was 6 points higher than the 9% room night increase due to 5% higher accommodation constant-currency ADRs and also due to a couple of points from flight bookings, partially offset by the 1 percentage point of negative impact from FX movements. Our accommodation constant-currency ADRs were negatively impacted by regional mix due to higher mix of room nights in Asia and the lower mix of room nights from the U.S. Excluding regional mix, constant-currency ADRs were up about 9 percentage points year-over-year. Despite the high ADRs in the second 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 second quarter were up about 58% year-over-year, driven by the continued expansion of Booking.com's flight offering. Revenue for the second quarter came in nicely ahead of our expectations, increasing 27% year-over-year, or about 28% on a constant-currency basis. Q2 revenue as a percentage of gross bookings was about 130 basis points above last year, which was in line with our expectations. Our underlying accommodation take rates continued to be in line with 2019 levels. Marketing expense, which is a highly variable expense line, increased 4% year-over-year. Marketing expense as a percentage of gross bookings was about 50 basis points lower than Q2 2022 due to higher ROIs in our pay channels and a higher mix of direct business. Performance marketing ROIs increased year-over-year due in part to our ongoing efforts to improve the efficiency of our marketing spend.
Marketing merchandising combined as a percentage of gross bookings in Q2 was about 60 basis points lower than last year, which is better than our expectation. Relative to expectation, this is primarily due to better ROI in our pay channels, as well as lower-than-expected merchandising spend, which was impacted by the booking window being more expanded than we expect in the quarter, which will push merchandising expense into future periods at the time revenue is recognized.
Sales and other expenses as a percentage of gross bookings were up about 30 basis points compared to last year, a bit better than our expectation. About 48% of Booking.com's gross bookings were processed through our payments platform in Q2, up from about 38% in Q2 2022. Our more fixed expenses in aggregates were up 20% year-over-year, which is below our expectations due to lower IT expenses in the quarter, including some impact from phasing of IT spend into late in the year. We continue to manage our more fixed expenses very carefully.
Adjusted EBITDA was $1.8 billion in the second quarter, which was up 64% year-over-year and would have been up 70% on a constant-currency basis. Adjusted EBITDA was well above our expectations due to the stronger top-line, the efficiencies in marketing merchandising, and lower-than-expected IT expenses. Our adjusted EBITDA margins increased by about 7 percentage points versus Q2 2022. Non-GAAP net income of $1.4 billion in the second quarter results in non-GAAP earnings per share of $37.62 per share, which was up 97% year-over-year. Our average share count in the second quarter was 9% below Q2 2022 and 15% below Q2 2019. On a GAAP basis, we had a net income of $1.3 billion in the quarter.
Now onto our cash and liquidity position. Our Q2 ending cash and investment balance of $15.7 billion was up versus our Q1 ending balance of $15.3 billion due to the $1.9 billion of debt issuances in May 2023 and the $1.6 billion of free cash flow generated in the second quarter, offset by about $3.1 billion in share repurchases we completed in the quarter. In the first half of the year, we repurchased $5.1 billion of shares, which represented 5% of our year end 2022 share count. The repurchases so far this year take our combined authorization down to $19 billion from the $24 billion we discussed earlier in the year. We remain comfortable with our ability to complete the full $24 billion of share repurchases within four years of when we started the program at the beginning of this year assuming no major downturn in the travel environments.
Now onto our thoughts for the third quarter of 2023. In July, we saw a year-over-year room night growth about 20%, up from 9% in Q2. Looking across our major regions, in July, we saw Asia up about 45%, rest of world up over 20%, Europe up mid-teens, and the U.S. up mid-single-digits. When comparing versus 2019, July room night growth was in a similar range, the 26% growth in Q2. The U.S. was our most recovered region with growth at over 30% versus 2019. Our comments for the third quarter made the assumption that room night growth will be up low-double-digits year-on-year, assuming some moderation in growth from July due in part the harder prior-year comparables in August and September. You'll recall from our commentary on the third quarter of 2022 that room night growth versus 2019 was 4% in July 2022 and 10% in August and September 2022.
In addition, we expect that due to the expanded booking window in the first half of the year for stays in Q3, but there'll be fewer last-minute bookings for stays in the rest of Q3. We expect Q3 gross bookings to grow about 7 points faster than room nights on a year-on-year basis, due to a few points from continued flight bookings growth and a few points of positive impact from FX movements. We expect accommodation constant-currency ADRs to be about in line with Q3 2022, including a couple of points of pressure from the changes in regional mix. We expect Q3 revenue as a percentage of gross bookings to be around 19%, slightly above last year, due to a more positive impact from timing in part due to the expanded booking window in the first half of this year and from increased revenue from payments. We expect these will be partially offset by a higher mix of flights and increased merchandising spend, some of which is related to bookings that we've seen earlier in the year. We expect Q3 marketing expense as a percentage of gross bookings to be lower than last year. We expect marketing and merchandising combined as a percentage of gross bookings in Q3 to be slightly lower than last year. We expect Q3 sales and other expenses as a percentage of gross bookings to be about 20 basis points higher than last year, primarily due to higher gross bookings mix. We expect our more fixed expenses in Q3 to grow year-over-year about 30%, due to higher personnel-related expenses, higher IT expenses, including the impact of fading from Q2 and higher indirect taxes in G&A. The year-over-year growth in our more fixed expenses includes about 7 percentage points from changes in FX. The difference between the 20% growth in our more fixed expenses in Q2 and the 30% growth in Q3 is driven mainly by FX, a major [Indecipherable] Taking all things into account, we expect adjusted -- we expect Q3 adjusted EBITDA to be around 20% higher than last year.
Given the strong level of bookings that we've seen, we are updating our commentary for the full year. We currently expect gross bookings to grow slightly over 20%, up from our previous expectation for low-teens growth. We expect full year room night growth in the mid teens and constant-currency ADRs -- constant-currency accommodation ADRs to be up slightly for the year, including a couple of points of pressure from changes in regional mix. We currently expect revenue as a percentage of gross bookings to increase year-over-year by about 20 basis points, down from our previous expectation of 50 basis points increase. The reduction in our full year take rate is driven by less of a benefit from timing, including -- due to the higher growth rate we expected earlier in this year and also due to the expanded booking window, and also from stronger performance, which drove a higher mix of flights than we expected earlier in the year. We currently expect marketing merchandising as percentage of gross bookings to be slightly below 2022 as compared to our previous expectation for it to be similar to 2022. The improvements in our expectation is driven primarily by higher ROIs in our pay channels. We currently expect our more fixed expenses to grow about 25%, up from our previous expectation for around 20%. The increase in our expectation is driven primarily by variable components of personnel expense due to the overperformance versus our expectations at the start of the year, as well as higher indirect taxes, which is generally tied to revenues, and some additional FX pressure. We manage our more fixed expenses 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 our adjusted EBITDA margins to expand by a couple of percentage points versus 2022.
In closing, we are pleased with our year-to-date results and the momentum in the business that we move into Q3. We'll now move to Q&A. Alan [Phonetic] can you please open the lines?